Q51 vs Q99
Q51 (Congenital malformations of uterus and cervix) compared with Q99 (Other chromosome abnormalities, 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. Q51 carries an Excludes1 note covering Q99: “syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99)”
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
| Q51Congenital malformations of uterus and cervix | Q99Other chromosome abnormalities, 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 | Congenital malformations of uterus and cervix is a non-billable ICD-10-CM category code (Q51). | Other chromosome abnormalities, not elsewhere classified is a non-billable ICD-10-CM category code (Q99). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources