Q91 vs Q92
Q91 (Trisomy 18 and Trisomy 13) compared with Q92 (Other trisomies and partial trisomies of the autosomes, not elsewhere classified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. Q92 carries an Excludes1 note covering Q91: “trisomies of chromosomes 13, 18, 21 (Q90-Q91)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| Q91Trisomy 18 and Trisomy 13 | Q92Other trisomies and partial trisomies of the autosomes, not elsewhere classified | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Trisomy 18 and Trisomy 13 is a non-billable ICD-10-CM category code (Q91). | Other trisomies and partial trisomies of the autosomes, not elsewhere classified is a non-billable ICD-10-CM category code (Q92). |
| Includes | — | unbalanced translocations and insertions |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources