Is Q91 a billable code?
No. Q91 is a header code that groups 8 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
Q91: Trisomy 18 and Trisomy 13
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
Q91 groups related diagnoses under trisomy 18 and trisomy 13. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under Q91
- Q91.0Trisomy 18, nonmosaicism (meiotic nondisjunction)
- Q91.1Trisomy 18, mosaicism (mitotic nondisjunction)
- Q91.2Trisomy 18, translocation
- Q91.3Trisomy 18, unspecified
- Q91.4Trisomy 13, nonmosaicism (meiotic nondisjunction)
- Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)
- Q91.6Trisomy 13, translocation
- Q91.7Trisomy 13, unspecified
Q91 questions
What does Q91 mean?
Q91 is the ICD-10-CM code for Trisomy 18 and Trisomy 13. 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.