ICD-10-CM · Chapter 17 · Q00-QA1
Q99 Other chromosome abnormalities, not elsewhere classified
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Q99..0 | Chimera 46, XX/46, XY | Yes |
| Q99..1 | 46, XX true hermaphrodite | Yes |
| Q99..2 | Fragile X chromosome | Yes |
| Q99..8 | Other specified chromosome abnormalities | No |
| Q99..81 | Usher syndrome | No |
| Q99..811 | Usher syndrome, type 1 | Yes |
| Q99..812 | Usher syndrome, type 2 | Yes |
| Q99..813 | Usher syndrome, type 3 | Yes |
| Q99..818 | Other Usher syndrome | Yes |
| Q99..819 | Usher syndrome, unspecified | Yes |
| Q99..89 | Other specified chromosome abnormalities | Yes |
| Q99..9 | Chromosomal abnormality, unspecified | Yes |
Last reviewed: September 2026