R99 Ill-defined and unknown cause of mortality
ICD-10-CM category R99 sits in Chapter 18 (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, R00-R99). It contains 1 billable code 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.
The category code
R99 itself is billable for FY2027: no more specific code exists under it.Billable codes in R99
| Code | Description |
|---|---|
R99 | Ill-defined and unknown cause of mortality |
Search within ICD-10-CM for R99 and related codes
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