N77 vs O00
N77 (Vulvovaginal ulceration and inflammation in diseases classified elsewhere) compared with O00 (Ectopic 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 O00: “abortion or ectopic or molar pregnancy (O00-O07, O08.0)”
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 | O00Ectopic 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). | Ectopic pregnancy is a non-billable ICD-10-CM category code (O00). |
| Includes | — | ruptured ectopic pregnancy |
| Use additional code | — | code from category O08 to identify any associated complication |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources