Q90.0: Trisomy 21, nonmosaicism (meiotic nondisjunction)
Q90.0 is the billable ICD-10-CM diagnosis code for Trisomy 21, nonmosaicism (meiotic nondisjunction). It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code Q90.0?
Q90.0 is the ICD-10-CM diagnosis code for Trisomy 21, nonmosaicism (meiotic nondisjunction). It belongs to category Q90 (Down syndrome).
Is Q90.0 a billable code?
Yes. Q90.0 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does Q90.0 belong to?
Q90.0 is part of ICD-10-CM category Q90 — Down syndrome, which has 8 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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