ICD-10-CM · FY 2026 APRIL UPDATE
Q91
Trisomy 18 and Trisomy 13
Diagnosis reference
Nonbillable categoryThis entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.
Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification
Related entries
Up to 30 descendants in this category
| CODE | DESCRIPTION | TYPE |
|---|---|---|
| Q91.0 | Trisomy 18, nonmosaicism (meiotic nondisjunction) | Billable |
| Q91.1 | Trisomy 18, mosaicism (mitotic nondisjunction) | Billable |
| Q91.2 | Trisomy 18, translocation | Billable |
| Q91.3 | Trisomy 18, unspecified | Billable |
| Q91.4 | Trisomy 13, nonmosaicism (meiotic nondisjunction) | Billable |
| Q91.5 | Trisomy 13, mosaicism (mitotic nondisjunction) | Billable |
| Q91.6 | Trisomy 13, translocation | Billable |
| Q91.7 | Trisomy 13, unspecified | Billable |
Use the complete reference
This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.
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