Q91
Q91: Trisomy 18 and Trisomy 13
Non-billable headerICD-10-CM
Q91 is a non-billable header ICD-10-CM code for trisomy 18 and trisomy 13. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with Q91
Their own Excludes1 notes name this code, so the conflict is not listed above.
- Q92Other trisomies and partial trisomies of the autosomes, not elsewhere classified
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead Q91
8 child codes. Green means billable.
- 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