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Q90.0

Q90.0: Trisomy 21, nonmosaicism (meiotic nondisjunction)

Billable / specific codeICD-10-CMPOA exempt

Q90.0 is a billable, specific ICD-10-CM code for trisomy 21, nonmosaicism (meiotic nondisjunction). It is valid for submission on a claim.

Check Q90.0 with the rest of the claim: free scrubber

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

Q90.0 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›meiotic nondisjunction
  • Trisomy›21›meiotic nondisjunction
  • Syndrome›trisomy›21›meiotic nondisjunction

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under Q90

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.