Q90.1
Q90.1: Trisomy 21, mosaicism (mitotic nondisjunction)
Billable / specific codeICD-10-CMPOA exempt
Q90.1 is a billable, specific ICD-10-CM code for trisomy 21, mosaicism (mitotic nondisjunction). It is valid for submission on a claim.
Check Q90.1 with the rest of the claim: free scrubberRisk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
Q90.1 is named in 3 Medicare coverage policies: 3 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
- A56781Billing and Coding: Transthoracic Echocardiography (TTE)
- A57306Billing and Coding: Transthoracic Echocardiography (TTE)
Alphabetic index entries that lead here
- Down syndrome›mitotic nondisjunction
- Down syndrome›mosaicism
- Trisomy›21›mitotic nondisjunction
- Trisomy›21›mosaicism
- Syndrome›trisomy›21›mitotic nondisjunction
- Syndrome›trisomy›21›mosaicism
Code history
Unchanged in every release from FY2024 to FY2027.