Q90

ICD-10Non-billable category

Down syndrome

Official ICD-10-CM descriptor (FY2026)

Down syndrome

Q90 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Use additional code

Report an additional code to identify the associated condition.

code(s) to identify any associated degree of intellectual disabilities (F70-F79)

Code also

Two codes may be needed; sequencing depends on the reason for the encounter.

associated physical condition(s), such as atrioventricular septal defect (Q21.2-)

More specific codes under 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)

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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.