Q91.1
Q91.1: Trisomy 18, mosaicism (mitotic nondisjunction)
Billable / specific codeICD-10-CMPOA exempt
Q91.1 is a billable, specific ICD-10-CM code for trisomy 18, mosaicism (mitotic nondisjunction). It is valid for submission on a claim.
Check Q91.1 with the rest of the claim: free scrubberRisk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
Q91.1 is named in 3 Medicare coverage policies: 3 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56781Billing and Coding: Transthoracic Echocardiography (TTE)
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
- A57306Billing and Coding: Transthoracic Echocardiography (TTE)
Alphabetic index entries that lead here
- Trisomy›18›mitotic nondisjunction
- Trisomy›18›mosaicism
- Syndrome›trisomy›18›mitotic nondisjunction
- Syndrome›trisomy›18›mosaicism
Code history
Unchanged in every release from FY2024 to FY2027.