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ICD-10-CM category

Q99: Other chromosome abnormalities, not elsewhere classified

12 subcodes · 10 billable · Look up any code with the ICD-10 search

Codes under Q99 (Other chromosome abnormalities, not elsewhere classified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

CodeDescriptionBillable
Q99.0Chimera 46, XX/46, XY✓
Q99.146, XX true hermaphrodite✓
Q99.2Fragile X chromosome✓
Q99.8Other specified chromosome abnormalities—
Q99.9Chromosomal abnormality, unspecified✓
Q99.81Usher syndrome—
Q99.89Other specified chromosome abnormalities✓
Q99.811Usher syndrome, type 1✓
Q99.812Usher syndrome, type 2✓
Q99.813Usher syndrome, type 3✓
Q99.818Other Usher syndrome✓
Q99.819Usher syndrome, unspecified✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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