Q90.1

ICD-10Billable

Trisomy 21, mosaicism (mitotic nondisjunction)

Official ICD-10-CM descriptor (FY2026)

Trisomy 21, mosaicism (mitotic nondisjunction)

Q90.1 is valid for submission on a claim — CMS flags it as a billable, specific code.

Related codes in Q90

Where this code sits

Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0)
Block: Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Parent code: Q90

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.