Is Q99.8 a billable code?
No. Q99.8 is a header code that groups 6 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
Q99.8: Other specified chromosome abnormalities
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
Q99.8 groups related diagnoses under other specified chromosome abnormalities. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under Q99.8
- Q99.811Usher syndrome, type 1
- Q99.812Usher syndrome, type 2
- Q99.813Usher syndrome, type 3
- Q99.818Other Usher syndrome
- Q99.819Usher syndrome, unspecified
- Q99.89Other specified chromosome abnormalities
Other codes in Q99 Other chromosome abnormalities, not elsewhere classified
Q99.8 questions
What does Q99.8 mean?
Q99.8 is the ICD-10-CM code for Other specified chromosome abnormalities. It is in chapter 17, Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.