K65 vs N73.5
K65 (Peritonitis) compared with N73.5 (Female pelvic peritonitis, unspecified), 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. K65 carries an Excludes1 note covering N73.5: “pelvic peritonitis, female (N73.3-N73.5)”
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
| K65Peritonitis | N73.5Female pelvic peritonitis, unspecified | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Peritonitis is a non-billable ICD-10-CM category code (K65). | Female pelvic peritonitis, unspecified is a billable ICD-10-CM diagnosis code (N73.5). |
| Use additional code | code (B95-B97), to identify infectious agent, if known | code (B95-B97), to identify infectious agent. |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources