Alphabetic Index · main term
Down syndrome
At the main termQ90.9
Down syndrome is a main term in the FY2027 ICD-10-CM Alphabetic Index (Index to Diseases and Injuries). The Index lists Q90.9 for the term on its own. It has 4 subterms and 5 code entries. First-level subterms include meiotic nondisjunction, mitotic nondisjunction, mosaicism, translocation. Confirm any code you find here in the Tabular List before you report it.