Q99 Other chromosome abnormalities, not elsewhere classified
ICD-10-CM category Q99 sits in Chapter 17 (Congenital malformations, deformations and chromosomal abnormalities, Q00-Q99). It contains 10 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
Q99.8 Other specified chromosome abnormalitiesQ99.81 Usher syndrome
Billable codes in Q99
| Code | Description |
|---|---|
Q99.0 | Chimera 46, XX/46, XY |
Q99.1 | 46, XX true hermaphrodite |
Q99.2 | Fragile X chromosome |
Q99.811 | Usher syndrome, type 1 |
Q99.812 | Usher syndrome, type 2 |
Q99.813 | Usher syndrome, type 3 |
Q99.818 | Other Usher syndrome |
Q99.819 | Usher syndrome, unspecified |
Q99.89 | Other specified chromosome abnormalities |
Q99.9 | Chromosomal abnormality, unspecified |
Search within ICD-10-CM for Q99 and related codes
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