ICD-10-CM · Chapter 17 · Q00-QA1
Q90 Down syndrome
Use Additional Code
- code(s) to identify any associated degree of intellectual disabilities (F70-F79)
Code Also
- associated physical condition(s), such as atrioventricular septal defect (Q21.2-)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Q90..0 | Trisomy 21, nonmosaicism (meiotic nondisjunction) | Yes |
| Q90..1 | Trisomy 21, mosaicism (mitotic nondisjunction) | Yes |
| Q90..2 | Trisomy 21, translocation | Yes |
| Q90..9 | Down syndrome, unspecified | Yes |
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category Q90:
- Down Syndrome — Síndrome de Down
Last reviewed: September 2026