M23 Internal derangement of knee

ICD-10-CM category M23 sits in Chapter 13 (Diseases of the musculoskeletal system and connective tissue, M00-M99). It contains 111 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Subcategories

M23.0 Cystic meniscusM23.00 Cystic meniscus, unspecified meniscusM23.01 Cystic meniscus, anterior horn of medial meniscusM23.02 Cystic meniscus, posterior horn of medial meniscusM23.03 Cystic meniscus, other medial meniscusM23.04 Cystic meniscus, anterior horn of lateral meniscusM23.05 Cystic meniscus, posterior horn of lateral meniscusM23.06 Cystic meniscus, other lateral meniscusM23.2 Derangement of meniscus due to old tear or injuryM23.20 Derangement of unsp meniscus due to old tear or injuryM23.21 Derang of ant horn of medial meniscus due to old tear/injM23.22 Derang of post horn of medial meniscus due to old tear/injM23.23 Derangement of oth medial meniscus due to old tear or injuryM23.24 Derang of anterior horn of lat mensc due to old tear/injM23.25 Derang of posterior horn of lat mensc due to old tear/injM23.26 Derangement of lateral meniscus due to old tear or injuryM23.3 Other meniscus derangementsM23.30 Other meniscus derangements, unspecified meniscusM23.31 Oth meniscus derangements, anterior horn of medial meniscusM23.32 Oth meniscus derangements, posterior horn of medial meniscusM23.33 Other meniscus derangements, other medial meniscusM23.34 Oth meniscus derangements, anterior horn of lateral meniscusM23.35 Oth meniscus derangements, posterior horn of lat menscM23.36 Other meniscus derangements, other lateral meniscusM23.4 Loose body in kneeM23.5 Chronic instability of kneeM23.6 Other spontaneous disruption of ligament(s) of kneeM23.60 Other spontaneous disruption of unspecified ligament of kneeM23.61 Oth spon disruption of anterior cruciate ligament of kneeM23.62 Oth spon disruption of posterior cruciate ligament of kneeM23.63 Oth spon disruption of medial collateral ligament of kneeM23.64 Oth spon disruption of lateral collateral ligament of kneeM23.67 Other spontaneous disruption of capsular ligament of kneeM23.8 Other internal derangements of kneeM23.8X Other internal derangements of kneeM23.9 Unspecified internal derangement of knee

Billable codes in M23

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