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HCPCS modifiers

A modifier is a two-character code appended to a procedure or supply code to show that the service was altered by a specific circumstance without changing what the code itself means. The CMS October 2026 file lists 364 active Level II modifiers. The most familiar family is the dressing and wound-care modifiers A1 to A9; others route claims correctly for ambulance origin and destination, anesthesia, and durable medical equipment rental or purchase.

Modifier	Long description	Short description
`A1`	Dressing for one wound	Dressing for one wound
`A2`	Dressing for two wounds	Dressing for two wounds
`A3`	Dressing for three wounds	Dressing for three wounds
`A4`	Dressing for four wounds	Dressing for four wounds
`A5`	Dressing for five wounds	Dressing for five wounds
`A6`	Dressing for six wounds	Dressing for six wounds
`A7`	Dressing for seven wounds	Dressing for seven wounds
`A8`	Dressing for eight wounds	Dressing for eight wounds
`A9`	Dressing for nine or more wounds	Dressing for 9 or more wound
`AA`	Anesthesia services performed personally by anesthesiologist	Anesthesia perf by anesgst
`AB`	Audiology service furnished personally by an audiologist without a physician/npp order for non-acute hearing assessment unrelated to disequilibrium, or hearing aids, or examinations for the purpose of prescribing, fitting, or changing hearing aids; service may be performed once every 12 months, per beneficiary	Aud svs w/o order evry 12mo
`AC`	Initial onboarding support payment for access beneficiary enrollment, device/app setup, and care coordination activities; first month only; once per beneficiary per track	Co-mgmt mod - onboarding
`AD`	Medical supervision by a physician: more than four concurrent anesthesia procedures	Md supervision, >4 anes proc
`AE`	Registered dietician	Registered dietician
`AF`	Specialty physician	Specialty physician
`AG`	Primary physician	Primary physician
`AH`	Clinical psychologist	Clinical psychologist
`AI`	Principal physician of record	Principal physician of rec
`AJ`	Clinical social worker	Clinical social worker
`AK`	Non participating physician	Non participating physician
`AM`	Physician, team member service	Physician, team member svc
`AO`	Alternate payment method declined by provider of service	Prov declined alt pmt method
`AP`	Determination of refractive state was not performed in the course of diagnostic ophthalmological examination	No dtmn of refractive state
`AQ`	Physician providing a service in an unlisted health professional shortage area (hpsa)	Physician service hpsa area
`AR`	Physician provider services in a physician scarcity area	Physician scarcity area
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery	Assistant at surgery service
`AT`	Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942)	Acute treatment
`AU`	Item furnished in conjunction with a urological, ostomy, or tracheostomy supply	Uro, ostomy or trach item
`AV`	Item furnished in conjunction with a prosthetic device, prosthetic or orthotic	Item w prosthetic/orthotic
`AW`	Item furnished in conjunction with a surgical dressing	Item w a surgical dressing
`AX`	Item furnished in conjunction with dialysis services	Item w dialysis services
`AY`	Item or service furnished to an esrd patient that is not for the treatment of esrd	Item/service not for esrd tx
`AZ`	Physician providing a service in a dental health professional shortage area for the purpose of an electronic health record incentive payment	Physician serv in dent hpsa
`BA`	Item furnished in conjunction with parenteral enteral nutrition (pen) services	Item w pen services
`BL`	Special acquisition of blood and blood products	Spec acquisition blood prods
`BO`	Orally administered nutrition, not by feeding tube	Nutrition oral admin no tube
`BP`	The beneficiary has been informed of the purchase and rental options and has elected to purchase the item	Bene electd to purchase item
`BR`	The beneficiary has been informed of the purchase and rental options and has elected to rent the item	Bene elected to rent item
`BU`	The beneficiary has been informed of the purchase and rental options and after 30 days has not informed the supplier of his/her decision	Bene undecided on purch/rent
`CA`	Procedure payable only in the inpatient setting when performed emergently on an outpatient who expires prior to admission	Procedure payable inpatient
`CB`	Service ordered by a renal dialysis facility (rdf) physician as part of the esrd beneficiary's dialysis benefit, is not part of the composite rate, and is separately reimbursable	Esrd bene part a snf-sep pay
`CC`	Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)	Procedure code change
`CD`	Amcc test has been ordered by an esrd facility or mcp physician that is part of the composite rate and is not separately billable	Amcc test for esrd or mcp md
`CE`	Amcc test has been ordered by an esrd facility or mcp physician that is a composite rate test but is beyond the normal frequency covered under the rate and is separately reimbursable based on medical necessity	Med neces amcc tst sep reimb
`CF`	Amcc test has been ordered by an esrd facility or mcp physician that is not part of the composite rate and is separately billable	Amcc tst not composite rate
`CG`	Policy criteria applied	Policy criteria applied
`CH`	0 percent impaired, limited or restricted	0 percent impaired, ltd, res
`CI`	At least 1 percent but less than 20 percent impaired, limited or restricted	1 to <20 percent impaired
`CJ`	At least 20 percent but less than 40 percent impaired, limited or restricted	20 to <40 percent impaired
`CK`	At least 40 percent but less than 60 percent impaired, limited or restricted	40 to <60 percent impaired
`CL`	At least 60 percent but less than 80 percent impaired, limited or restricted	60 to <80 percent impaired
`CM`	At least 80 percent but less than 100 percent impaired, limited or restricted	80 to <100 percent impaired
`CN`	100 percent impaired, limited or restricted	100 percent impaired, ltd
`CO`	Outpatient occupational therapy services furnished in whole or in part by an occupational therapy assistant	Outpatient ot service by ota
`CQ`	Outpatient physical therapy services furnished in whole or in part by a physical therapist assistant	Outpatient pt service by pta
`CR`	Catastrophe/disaster related	Catastrophe/disaster related
`CS`	Cost-sharing waived for specified covid-19 testing-related services that result in and order for or administration of a covid-19 test and/or used for cost-sharing waived preventive services furnished via telehealth in rural health clinics and federally qualified health centers during the covid-19 public health emergency	Cost share waiver covid-19
`CT`	Computed tomography services furnished using equipment that does not meet each of the attributes of the national electrical manufacturers association (nema) xr-29-2013 standard	Ct does not meet nema standa
`DA`	Oral health assessment by a licensed health professional other than a dentist	Oral health assess, not dent
`E1`	Upper left, eyelid	Upper left eyelid
`E2`	Lower left, eyelid	Lower left eyelid
`E3`	Upper right, eyelid	Upper right eyelid
`E4`	Lower right, eyelid	Lower right eyelid
`EA`	Erythropoietic stimulating agent (esa) administered to treat anemia due to anti-cancer chemotherapy	Esa, anemia, chemo-induced
`EB`	Erythropoietic stimulating agent (esa) administered to treat anemia due to anti-cancer radiotherapy	Esa, anemia, radio-induced
`EC`	Erythropoietic stimulating agent (esa) administered to treat anemia not due to anti-cancer radiotherapy or anti-cancer chemotherapy	Esa, anemia, non-chemo/radio
`ED`	Hematocrit level has exceeded 39% (or hemoglobin level has exceeded 13.0 g/dl) for 3 or more consecutive billing cycles immediately prior to and including the current cycle	Hct>39% or hgb>13g>=3 cycle
`EE`	Hematocrit level has not exceeded 39% (or hemoglobin level has not exceeded 13.0 g/dl) for 3 or more consecutive billing cycles immediately prior to and including the current cycle	Hct>39% or hgb>13g<3 cycle
`EJ`	Subsequent claims for a defined course of therapy, e.g., epo, sodium hyaluronate, infliximab	Subsequent claim
`EM`	Emergency reserve supply (for esrd benefit only)	Emer reserve supply (esrd)
`EP`	Service provided as part of medicaid early periodic screening diagnosis and treatment (epsdt) program	Medicaid epsdt program svc
`ER`	Items and services furnished by a provider-based, off-campus emergency department	Off-campus ed service
`ET`	Emergency services	Emergency services
`EX`	Expatriate beneficiary	Expatriate beneficiary
`EY`	No physician or other licensed health care provider order for this item or service	No md order for item/service
`F1`	Left hand, second digit	Left hand, second digit
`F2`	Left hand, third digit	Left hand, third digit
`F3`	Left hand, fourth digit	Left hand, fourth digit
`F4`	Left hand, fifth digit	Left hand, fifth digit
`F5`	Right hand, thumb	Right hand, thumb
`F6`	Right hand, second digit	Right hand, second digit
`F7`	Right hand, third digit	Right hand, third digit
`F8`	Right hand, fourth digit	Right hand, fourth digit
`F9`	Right hand, fifth digit	Right hand, fifth digit
`FA`	Left hand, thumb	Left hand, thumb
`FB`	Item provided without cost to provider, supplier or practitioner, or full credit received for replaced device (examples, but not limited to, covered under warranty, replaced due to defect, free samples)	Item provided without cost
`FC`	Partial credit received for replaced device	Part credit, replaced device
`FP`	Service provided as part of family planning program	Svc part of family plan pgm
`FQ`	The service was furnished using audio-only communication technology	Audio-only service
`FR`	The supervising practitioner was present through two-way, audio/video communication technology	Two-way a/v dir supervision
`FS`	Split (or shared) evaluation and management visit	Split or shared e/m visit
`FT`	Unrelated evaluation and management (e/m) visit on the same day as another e/m visit or during a global procedure (preoperative, postoperative period, or on the same day as the procedure, as applicable). (report when an e/m visit is furnished within the global period but is unrelated, or when one or more additional e/m visits furnished on the same day are unrelated)	Separate, unrelated e/m
`FX`	X-ray taken using film	X-ray taken using film
`FY`	X-ray taken using computed radiography technology/cassette-based imaging	Computed radiography x-ray
`G0`	Telehealth services for diagnosis, evaluation, or treatment, of symptoms of an acute stroke	Telestroke
`G1`	Most recent urr reading of less than 60	Urr reading of less than 60
`G2`	Most recent urr reading of 60 to 64.9	Urr reading of 60 to 64.9
`G3`	Most recent urr reading of 65 to 69.9	Urr reading of 65 to 69.9
`G4`	Most recent urr reading of 70 to 74.9	Urr reading of 70 to 74.9
`G5`	Most recent urr reading of 75 or greater	Urr reading of 75 or greater
`G6`	Esrd patient for whom less than six dialysis sessions have been provided in a month	Esrd patient <6 dialysis/mth
`G7`	Pregnancy resulted from rape or incest or pregnancy certified by physician as life threatening	Payment limits do not apply
`G8`	Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedure	Monitored anesthesia care
`G9`	Monitored anesthesia care for patient who has history of severe cardio-pulmonary condition	Mac for at risk patient
`GA`	Waiver of liability statement issued as required by payer policy, individual case	Liability waiver ind case
`GB`	Claim being re-submitted for payment because it is no longer covered under a global payment demonstration	Claim resubmitted
`GC`	This service has been performed in part by a resident under the direction of a teaching physician	Resident/teaching phys serv
`GE`	This service has been performed by a resident without the presence of a teaching physician under the primary care exception	Resident prim care exception
`GF`	Non-physician (e.g. nurse practitioner (np), certified registered nurse anesthetist (crna), certified registered nurse (crn), clinical nurse specialist (cns), physician assistant (pa)) services in a critical access hospital	Nonphysician serv c a hosp
`GG`	Performance and payment of a screening mammogram and diagnostic mammogram on the same patient, same day	Payment screen mam + diagmam
`GH`	Diagnostic mammogram converted from screening mammogram on same day	Diag mammo to screening mamo
`GJ`	"opt out" physician or practitioner emergency or urgent service	Opt out provider of er srvc
`GK`	Reasonable and necessary item/service associated with a ga or gz modifier	Actual item/service ordered
`GL`	Medically unnecessary upgrade provided instead of non-upgraded item, no charge, no advance beneficiary notice (abn)	Upgraded item, no charge
`GM`	Multiple patients on one ambulance trip	Multiple transports
`GN`	Services delivered under an outpatient speech language pathology plan of care	Op speech language service
`GO`	Services delivered under an outpatient occupational therapy plan of care	Op occupational therapy serv
`GP`	Services delivered under an outpatient physical therapy plan of care	Op pt services
`GQ`	Via asynchronous telecommunications system	Telehealth store and forward
`GR`	This service was performed in whole or in part by a resident in a department of veterans affairs medical center or clinic, supervised in accordance with va policy	Service by va resident
`GS`	Dosage of erythropoietin stimulating agent has been reduced and maintained in response to hematocrit or hemoglobin level	Epo/darbepoietin reduced 25%
`GT`	Via interactive audio and video telecommunication systems	Interactivetelecommunication
`GU`	Waiver of liability statement issued as required by payer policy, routine notice	Liability waiver rout notice
`GV`	Attending physician not employed or paid under arrangement by the patient's hospice provider	Attending phys not hospice
`GW`	Service not related to the hospice patient's terminal condition	Service unrelated to term co
`GX`	Notice of liability issued, voluntary under payer policy	Voluntary liability notice
`GY`	Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit	Statutorily excluded
`GZ`	Item or service expected to be denied as not reasonable and necessary	Not reasonable and necessary
`H9`	Court-ordered	Court-ordered
`HA`	Child/adolescent program	Child/adolescent program
`HB`	Adult program, non geriatric	Adult program non-geriatric
`HC`	Adult program, geriatric	Adult program geriatric
`HD`	Pregnant/parenting women's program	Pregnant/parenting program
`HE`	Mental health program	Mental health program
`HF`	Substance abuse program	Substance abuse program
`HG`	Opioid addiction treatment program	Opioid addiction tx program
`HH`	Integrated mental health/substance abuse program	Mental hlth/substance abs pr
`HI`	Integrated mental health and intellectual disability/developmental disabilities program	Men hlth intel/dev disab pgm
`HJ`	Employee assistance program	Employee assistance program
`HK`	Specialized mental health programs for high-risk populations	Spec hgh rsk mntl hlth pop p
`HL`	Intern	Intern
`HM`	Less than bachelor degree level	Less than bachelor degree lv
`HN`	Bachelors degree level	Bachelors degree level
`HO`	Masters degree level	Masters degree level
`HP`	Doctoral level	Doctoral level
`HQ`	Group setting	Group setting
`HR`	Family/couple with client present	Family/couple w client prsnt
`HS`	Family/couple without client present	Family/couple w/o client prs
`HT`	Multi-disciplinary team	Multi-disciplinary team
`HU`	Funded by child welfare agency	Child welfare agency funded
`HV`	Funded state addictions agency	Funded state addiction agncy
`HW`	Funded by state mental health agency	State mntl hlth agncy funded
`HX`	Funded by county/local agency	County/local agency funded
`HY`	Funded by juvenile justice agency	Funded by juvenile justice
`HZ`	Funded by criminal justice agency	Criminal justice agncy fund
`J1`	Competitive acquisition program no-pay submission for a prescription number	Cap no-pay for prescript num
`J2`	Competitive acquisition program, restocking of emergency drugs after emergency administration	Cap restock of emerg drugs
`J3`	Competitive acquisition program (cap), drug not available through cap as written, reimbursed under average sales price methodology	Cap drug unavail thru cap
`J4`	Dmepos item subject to dmepos competitive bidding program that is furnished by a hospital upon discharge	Dmepos comp bid furn by hosp
`J5`	Off-the-shelf orthotic subject to dmepos competitive bidding program that is furnished as part of a physical therapist or occupational therapist professional service	Dmepos comp bid fur by pt/ot
`JA`	Administered intravenously	Administered intravenously
`JB`	Administered subcutaneously	Administered subcutaneously
`JC`	Skin substitute used as a graft	Skin substitute graft
`JD`	Skin substitute not used as a graft	Skin sub not used as a graft
`JE`	Administered via dialysate	Administered via dialysate
`JK`	One month supply or less of drug or biological	Drug supply 1 month or less
`JL`	Three month supply of drug or biological	Drug 3 month supply
`JW`	Drug amount discarded/not administered to any patient	Discarded drug not administe
`JZ`	Zero drug amount discarded/not administered to any patient	Zero drug wasted
`K0`	Lower extremity prosthesis functional level 0 - does not have the ability or potential to ambulate or transfer safely with or without assistance and a prosthesis does not enhance their quality of life or mobility.	Lwr ext prost functnl lvl 0
`K1`	Lower extremity prosthesis functional level 1 - has the ability or potential to use a prosthesis for transfers or ambulation on level surfaces at fixed cadence. typical of the limited and unlimited household ambulator.	Lwr ext prost functnl lvl 1
`K2`	Lower extremity prosthesis functional level 2 - has the ability or potential for ambulation with the ability to traverse low level environmental barriers such as curbs, stairs or uneven surfaces. typical of the limited community ambulator.	Lwr ext prost functnl lvl 2
`K3`	Lower extremity prosthesis functional level 3 - has the ability or potential for ambulation with variable cadence. typical of the community ambulator who has the ability to transverse most environmental barriers and may have vocational, therapeutic, or exercise activity that demands prosthetic utilization beyond simple locomotion.	Lwr ext prost functnl lvl 3
`K4`	Lower extremity prosthesis functional level 4 - has the ability or potential for prosthetic ambulation that exceeds the basic ambulation skills, exhibiting high impact, stress, or energy levels, typical of the prosthetic demands of the child, active adult, or athlete.	Lwr ext prost functnl lvl 4
`KA`	Add on option/accessory for wheelchair	Wheelchair add-on option/acc
`KB`	Beneficiary requested upgrade for abn, more than 4 modifiers identified on claim	>4 modifiers on claim
`KC`	Replacement of special power wheelchair interface	Repl special pwr wc intrface
`KD`	Drug or biological infused through dme	Drug/biological dme infused
`KE`	Bid under round one of the dmepos competitive bidding program for use with non-competitive bid base equipment	Bid under round 1 dmepos cb
`KF`	Item designated by fda as class iii device	Fda class iii device
`KG`	Dmepos item subject to dmepos competitive bidding program number 1	Dmepos comp bid prgm no 1
`KH`	Dmepos item, initial claim, purchase or first month rental	Dmepos ini clm, pur/1 mo rnt
`KI`	Dmepos item, second or third month rental	Dmepos 2nd or 3rd mo rental
`KJ`	Dmepos item, parenteral enteral nutrition (pen) pump or capped rental, months four to fifteen	Dmepos pen pmp or 4-15mo rnt
`KK`	Dmepos item subject to dmepos competitive bidding program number 2	Dmepos comp bid prgm no 2
`KL`	Dmepos item delivered via mail	Dmepos mailorder comp bid
`KM`	Replacement of facial prosthesis including new impression/moulage	Rplc facial prosth new imp
`KN`	Replacement of facial prosthesis using previous master model	Rplc facial prosth old mod
`KO`	Single drug unit dose formulation	Single drug unit dose form
`KP`	First drug of a multiple drug unit dose formulation	First drug of multi drug u d
`KQ`	Second or subsequent drug of a multiple drug unit dose formulation	2nd/subsqnt drg multi drg ud
`KR`	Rental item, billing for partial month	Rental item partial month
`KS`	Glucose monitor supply for diabetic beneficiary not treated with insulin	Glucose monitor supply
`KT`	Beneficiary resides in a competitive bidding area and travels outside that competitive bidding area and receives a competitive bid item	Item from noncontract supply
`KU`	Dmepos item subject to dmepos competitive bidding program number 3	Dmepos comp bid prgm no 3
`KV`	Dmepos item subject to dmepos competitive bidding program that is furnished as part of a professional service	Dmepos item, profession serv
`KW`	Dmepos item subject to dmepos competitive bidding program number 4	Dmepos comp bid prgm no 4
`KX`	Requirements specified in the medical policy have been met	Documentation on file
`KY`	Dmepos item subject to dmepos competitive bidding program number 5	Dmepos comp bid prgm no 5
`KZ`	New coverage not implemented by managed care	New cov not implement by m+c
`LC`	Left circumflex coronary artery	Lft circum coronary artery
`LD`	Left anterior descending coronary artery	Left ant des coronary artery
`LL`	Lease/rental (use the 'll' modifier when dme equipment rental is to be applied against the purchase price)	Lease/rental (appld to pur)
`LM`	Left main coronary artery	Left main coronary artery
`LR`	Laboratory round trip	Laboratory round trip
`LS`	Fda-monitored intraocular lens implant	Fda-monitored iol implant
`LT`	Left side (used to identify procedures performed on the left side of the body)	Left side
`LU`	Fractionated payment	Fractionated payment
`M2`	Medicare secondary payer (msp)	Medicare secondary payer
`MS`	Six month maintenance and servicing fee for reasonable and necessary parts and labor which are not covered under any manufacturer or supplier warranty	6-mo maint/svc fee parts/lbr
`N1`	Group 1 oxygen coverage criteria met	Group 1 oxygen cov crit met
`N2`	Group 2 oxygen coverage criteria met	Group 2 oxygen cov crit met
`N3`	Group 3 oxygen coverage criteria met	Group 3 oxygen cov crit met
`NB`	Nebulizer system, any type, fda-cleared for use with specific drug	Drug specific nebulizer
`NR`	New when rented (use the 'nr' modifier when dme which was new at the time of rental is subsequently purchased)	New when rented
`NU`	New equipment	New equipment
`P1`	A normal healthy patient	Normal healthy patient
`P2`	A patient with mild systemic disease	Patient w/mild syst disease
`P3`	A patient with severe systemic disease	Patient w/severe sys disease
`P4`	A patient with severe systemic disease that is a constant threat to life	Pt w/sev sys dis threat life
`P5`	A moribund patient who is not expected to survive without the operation	Pt not expect surv w/o oper
`P6`	A declared brain-dead patient whose organs are being removed for donor purposes	Brain-dead pt organs removed
`PA`	Surgical or other invasive procedure on wrong body part	Surgery, wrong body part
`PB`	Surgical or other invasive procedure on wrong patient	Surgery, wrong patient
`PC`	Wrong surgery or other invasive procedure on patient	Wrong surgery on patient
`PD`	Diagnostic or related non diagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days	Inp admit w/in 3 days
`PI`	Positron emission tomography (pet) or pet/computed tomography (ct) to inform the initial treatment strategy of tumors that are biopsy proven or strongly suspected of being cancerous based on other diagnostic testing	Pet tumor init tx strat
`PL`	Progressive addition lenses	Progressive addition lenses
`PM`	Post mortem	Post mortem
`PN`	Non-excepted service provided at an off-campus, outpatient, provider-based department of a hospital	Non-excepted off-campus svc
`PO`	Excepted service provided at an off-campus, outpatient, provider-based department of a hospital	Excepted off-campus service
`PS`	Positron emission tomography (pet) or pet/computed tomography (ct) to inform the subsequent treatment strategy of cancerous tumors when the beneficiary's treating physician determines that the pet study is needed to inform subsequent anti-tumor strategy	Pet tumor subsq tx strategy
`PT`	Colorectal cancer screening test; converted to diagnostic test or other procedure	Clrctal screen to diagn
`Q0`	Investigational clinical service provided in a clinical research study that is in an approved clinical research study	Invest clinical research
`Q1`	Routine clinical service provided in a clinical research study that is in an approved clinical research study	Routine clinical research
`Q2`	Demonstration procedure/service	Demo procedure, service
`Q3`	Live kidney donor surgery and related services	Live donor surgery/services
`Q4`	Service for ordering/referring physician qualifies as a service exemption	Svc exempt - ordrg/rfrng md
`Q5`	Service furnished under a reciprocal billing arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area	Recip bill arr subs md or pt
`Q6`	Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area	Fee/time comp subst md or pt
`Q7`	One class a finding	One class a finding
`Q8`	Two class b findings	Two class b findings
`Q9`	One class b and two class c findings	1 class b & 2 class c fndngs
`QA`	Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts is less than 1 liter per minute (lpm)	Avg sta day/night o2 < 1 lpm
`QB`	Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts exceeds 4 liters per minute (lpm) and portable oxygen is prescribed	Avg day/nite o2 > 4 lpm/port
`QC`	Single channel monitoring	Single channel monitoring
`QD`	Recording and storage in solid state memory by a digital recorder	Rcrdg/strg in sld st memory
`QE`	Prescribed amount of stationary oxygen while at rest is less than 1 liter per minute (lpm)	Stationary o2 @ rest <1 lpm
`QF`	Prescribed amount of stationary oxygen while at rest exceeds 4 liters per minute (lpm) and portable oxygen is prescribed	Station o2 @ rest >4lpm/port
`QG`	Prescribed amount of stationary oxygen while at rest is greater than 4 liters per minute (lpm)	Station o2 @ rest > 4 lpm
`QH`	Oxygen conserving device is being used with an oxygen delivery system	Oxygen cnsrvg dvc w del sys
`QJ`	Services/items provided to a prisoner or patient in state or local custody, however the state or local government, as applicable, meets the requirements in 42 cfr 411.4 (b)	Patient in state/locl custod
`QK`	Medical direction of two, three, or four concurrent anesthesia procedures involving qualified individuals	Med dir 2-4 cncrnt anes proc
`QL`	Patient pronounced dead after ambulance called	Patient died after amb call
`QM`	Ambulance service provided under arrangement by a provider of services	Ambulance arr by provider
`QN`	Ambulance service furnished directly by a provider of services	Ambulance furn by provider
`QP`	Documentation is on file showing that the laboratory test(s) was ordered individually or ordered as a cpt-recognized panel other than automated profile codes 80002-80019, g0058, g0059, and g0060.	Individually ordered lab tst
`QR`	Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts is greater than 4 liters per minute (lpm)	Avg sta day/night o2 > 4 lpm
`QS`	Monitored anesthesia care service	Monitored anesthesia care
`QT`	Recording and storage on tape by an analog tape recorder	Rcrdg/strg tape analog recdr
`QW`	Clia waived test	Clia waived test
`QX`	Crna service: with medical direction by a physician	Crna svc w/ md med direction
`QY`	Medical direction of one certified registered nurse anesthetist (crna) by an anesthesiologist	Medically directed crna
`QZ`	Crna service: without medical direction by a physician	Crna svc w/o med dir by md
`RA`	Replacement of a dme, orthotic or prosthetic item	Replacement of dme item
`RB`	Replacement of a part of a dme, orthotic or prosthetic item furnished as part of a repair	Replacement part, dme item
`RC`	Right coronary artery	Right coronary artery
`RD`	Drug provided to beneficiary, but not administered "incident-to"	Drug admin not incident-to
`RE`	Furnished in full compliance with fda-mandated risk evaluation and mitigation strategy (rems)	Furnish full compliance rems
`RI`	Ramus intermedius coronary artery	Ramus intermedius cor artery
`RR`	Rental (use the 'rr' modifier when dme is to be rented)	Rental (dme)
`RT`	Right side (used to identify procedures performed on the right side of the body)	Right side
`SA`	Nurse practitioner rendering service in collaboration with a physician	Nurse practitioner w physici
`SB`	Nurse midwife	Nurse midwife
`SC`	Medically necessary service or supply	Medically necessary serv/sup
`SD`	Services provided by registered nurse with specialized, highly technical home infusion training	Serv by home infusion rn
`SE`	State and/or federally-funded programs/services	State/fed funded program/ser
`SF`	Second opinion ordered by a professional review organization (pro) per section 9401, p.l. 99-272 (100% reimbursement - no medicare deductible or coinsurance)	2nd opinion ordered by pro
`SG`	Ambulatory surgical center (asc) facility service	Asc facility service
`SH`	Second concurrently administered infusion therapy	2nd concurrent infusion ther
`SJ`	Third or more concurrently administered infusion therapy	3rd concurrent infusion ther
`SK`	Member of high risk population (use only with codes for immunization)	High risk population
`SL`	State supplied vaccine	State supplied vaccine
`SM`	Second surgical opinion	Second opinion
`SN`	Third surgical opinion	Third opinion
`SQ`	Item ordered by home health	Item ordered by home health
`SS`	Home infusion services provided in the infusion suite of the iv therapy provider	Hit in infusion suite
`ST`	Related to trauma or injury	Related to trauma or injury
`SU`	Procedure performed in physician's office (to denote use of facility and equipment)	Performed in phys office
`SV`	Pharmaceuticals delivered to patient's home but not utilized	Drugs delivered not used
`SW`	Services provided by a certified diabetic educator	Serv by cert diab educator
`SY`	Persons who are in close contact with member of high-risk population (use only with codes for immunization)	Contact w/high-risk pop
`T1`	Left foot, second digit	Left foot, second digit
`T2`	Left foot, third digit	Left foot, third digit
`T3`	Left foot, fourth digit	Left foot, fourth digit
`T4`	Left foot, fifth digit	Left foot, fifth digit
`T5`	Right foot, great toe	Right foot, great toe
`T6`	Right foot, second digit	Right foot, second digit
`T7`	Right foot, third digit	Right foot, third digit
`T8`	Right foot, fourth digit	Right foot, fourth digit
`T9`	Right foot, fifth digit	Right foot, fifth digit
`TA`	Left foot, great toe	Left foot, great toe
`TB`	Drug or biological acquired with 340b drug pricing program discount, reported for informational purposes	340b drug
`TC`	Technical component; under certain circumstances, a charge may be made for the technical component alone; under those circumstances the technical component charge is identified by adding modifier 'tc' to the usual procedure number; technical component charges are institutional charges and not billed separately by physicians; however, portable x-ray suppliers only bill for technical component and should utilize modifier tc; the charge data from portable x-ray suppliers will then be used to build customary and prevailing profiles	Technical component
`TD`	Rn	Rn
`TE`	Lpn/lvn	Lpn/lvn
`TF`	Intermediate level of care	Intermediate level of care
`TG`	Complex/high tech level of care	Complex/high tech level care
`TH`	Obstetrical treatment/services, prenatal or postpartum	Ob tx/srvcs prenatl/postpart
`TJ`	Program group, child and/or adolescent	Child/adolescent program gp
`TK`	Extra patient or passenger, non-ambulance	Extra patient or passenger
`TL`	Early intervention/individualized family service plan (ifsp)	Early intervention ifsp
`TM`	Individualized education program (iep)	Individualized ed prgrm(iep)
`TN`	Rural/outside providers' customary service area	Rural/out of service area
`TP`	Medical transport, unloaded vehicle	Med transprt unloaded vehicl
`TQ`	Basic life support transport by a volunteer ambulance provider	Bls by volunteer amb providr
`TR`	School-based individualized education program (iep) services provided outside the public school district responsible for the student	School-based iep out of dist
`TS`	Follow-up service	Follow-up service
`TT`	Individualized service provided to more than one patient in same setting	Additional patient
`TU`	Special payment rate, overtime	Overtime payment rate
`TV`	Special payment rates, holidays/weekends	Holiday/weekend payment rate
`TW`	Back-up equipment	Back-up equipment
`U1`	Medicaid level of care 1, as defined by each state	M/caid care lev 1 state def
`U2`	Medicaid level of care 2, as defined by each state	M/caid care lev 2 state def
`U3`	Medicaid level of care 3, as defined by each state	M/caid care lev 3 state def
`U4`	Medicaid level of care 4, as defined by each state	M/caid care lev 4 state def
`U5`	Medicaid level of care 5, as defined by each state	M/caid care lev 5 state def
`U6`	Medicaid level of care 6, as defined by each state	M/caid care lev 6 state def
`U7`	Medicaid level of care 7, as defined by each state	M/caid care lev 7 state def
`U8`	Medicaid level of care 8, as defined by each state	M/caid care lev 8 state def
`U9`	Medicaid level of care 9, as defined by each state	M/caid care lev 9 state def
`UA`	Medicaid level of care 10, as defined by each state	M/caid care lev 10 state def
`UB`	Medicaid level of care 11, as defined by each state	M/caid care lev 11 state def
`UC`	Medicaid level of care 12, as defined by each state	M/caid care lev 12 state def
`UD`	Medicaid level of care 13, as defined by each state	M/caid care lev 13 state def
`UE`	Used durable medical equipment	Used durable med equipment
`UF`	Services provided in the morning	Services provided, morning
`UG`	Services provided in the afternoon	Services provided, afternoon
`UH`	Services provided in the evening	Services provided, evening
`UJ`	Services provided at night	Services provided, night
`UK`	Services provided on behalf of the client to someone other than the client (collateral relationship)	Svc on behalf client-collat
`UN`	Two patients served	Two patients served
`UP`	Three patients served	Three patients served
`UQ`	Four patients served	Four patients served
`UR`	Five patients served	Five patients served
`US`	Six or more patients served	Six or more patients served
`V1`	Demonstration modifier 1	Demonstration modifier 1
`V2`	Demonstration modifier 2	Demonstration modifier 2
`V3`	Demonstration modifier 3	Demonstration modifier 3
`V4`	Demonstration modifier 4	Demonstration modifier 4
`V5`	Vascular catheter (alone or with any other vascular access)	Vascular catheter
`V6`	Arteriovenous graft (or other vascular access not including a vascular catheter)	Arteriovenous graft
`V7`	Arteriovenous fistula only (in use with two needles)	Arteriovenous fistula
`VM`	Medicare diabetes prevention program (mdpp) virtual make-up session	Mdpp virtual make-up session
`VP`	Aphakic patient	Aphakic patient
`X1`	Continuous/broad services: for reporting services by clinicians, who provide the principal care for a patient, with no planned endpoint of the relationship; services in this category represent comprehensive care, dealing with the entire scope of patient problems, either directly or in a care coordination role; reporting clinician service examples include, but are not limited to: primary care, and clinicians providing comprehensive care to patients in addition to specialty care	Continuous/broad services
`X2`	Continuous/focused services: for reporting services by clinicians whose expertise is needed for the ongoing management of a chronic disease or a condition that needs to be managed and followed with no planned endpoint to the relationship; reporting clinician service examples include but are not limited to: a rheumatologist taking care of the patient's rheumatoid arthritis longitudinally but not providing general primary care services	Continuous/focused services
`X3`	Episodic/broad services: for reporting services by clinicians who have broad responsibility for the comprehensive needs of the patient that is limited to a defined period and circumstance such as a hospitalization; reporting clinician service examples include but are not limited to the hospitalist's services rendered providing comprehensive and general care to a patient while admitted to the hospital	Episodic/broad services
`X4`	Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period	Episodic/focused services
`X5`	Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent and related services requested by another clinician; this modifier is reported for patient relationships that may not be adequately captured by the above alternative categories; reporting clinician service examples include but are not limited to, the radiologist's interpretation of an imaging study requested by another clinician	Svc req by another clinician
`XE`	Separate encounter, a service that is distinct because it occurred during a separate encounter	Separate encounter
`XP`	Separate practitioner, a service that is distinct because it was performed by a different practitioner	Separate practitioner
`XS`	Separate structure, a service that is distinct because it was performed on a separate organ/structure	Separate organ/structure
`XU`	Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service	Unusual separate service