ICD-10-CM Alphabetic Index · FY 2026 38 Entries
Trisomy in the ICD-10-CM Index ICD-10-CM
The main term Trisomy (syndrome) carries 38 index entries pointing to 18 ICD-10-CM codes. The default entry is Q92.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
38
Index Entries
18
Codes Referenced
Q92.9
Default Code
T
Letter
38 of 38 shown
ICD-10-CM
Index Entries Under Trisomy 38 entries · 18 codes
Trisomy (syndrome) Q92.9
autosomes Q92.9
chromosome specified NEC Q92.8
partial Q92.2
due to unbalanced translocation Q92.5
whole (nonsex chromosome)
meiotic nondisjunction Q92.0
mitotic nondisjunction Q92.1
mosaicism Q92.1
specified NEC Q92.8
due to
dicentrics see Extra, marker chromosomes
extra rings see Extra, marker chromosomes
isochromosomes see Extra, marker chromosomes
specified NEC Q92.8
whole chromosome Q92.9
meiotic nondisjunction Q92.0
mitotic nondisjunction Q92.1
mosaicism Q92.1
partial Q92.9
specified NEC Q92.8
13 (partial) Q91.7
meiotic nondisjunction Q91.4
mitotic nondisjunction Q91.5
mosaicism Q91.5
translocation Q91.6
18 (partial) Q91.3
meiotic nondisjunction Q91.0
mitotic nondisjunction Q91.1
mosaicism Q91.1
translocation Q91.2
20 Q92.8
21 (partial) Q90.9
meiotic nondisjunction Q90.0
mitotic nondisjunction Q90.1
mosaicism Q90.1
translocation Q90.2
22 Q92.8
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
