N77 vs O23
N77 (Vulvovaginal ulceration and inflammation in diseases classified elsewhere) compared with O23 (Infections of genitourinary tract in pregnancy), 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. N77 carries an Excludes1 note covering O23: “pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)”
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
| N77Vulvovaginal ulceration and inflammation in diseases classified elsewhere | O23Infections of genitourinary tract in pregnancy | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Vulvovaginal ulceration and inflammation in diseases classified elsewhere is a non-billable ICD-10-CM category code (N77). | Infections of genitourinary tract in pregnancy is a non-billable ICD-10-CM category code (O23). |
| Use additional code | — | code to identify organism (B95.-, B96.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources