Q99.89 Other specified chromosome abnormalities

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Other specified chromosome abnormalities is Q99.89 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
Q90-Q99: Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Category Q99
13 codes (10 billable)
FY2026 Status
New code in FY2026

Official Coding Guidelines

POA indicator for congenital conditions/anomalies and Q00-Q99 exception

Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. Congenital conditions are always considered present on admission.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section III

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

Q99 Other chromosome abnormalities, not elsewhere classified

Related Codes in Q99

Q99 Other chromosome abnormalities, not elsewhere classified Q99.0 Chimera 46, XX/46, XY Q99.1 46, XX true hermaphrodite Q99.2 Fragile X chromosome Q99.8 Other specified chromosome abnormalities Q99.81 Usher syndrome 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 Q99.9 Chromosomal abnormality, unspecified
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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