Q55 vs Q99
Q55 (Other congenital malformations of male genital organs) 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. Q55 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
| Q55Other congenital malformations of male genital organs | 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 | Other congenital malformations of male genital organs is a non-billable ICD-10-CM category code (Q55). | 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