K65 vs P78.0
K65 (Peritonitis) compared with P78.0 (Perinatal intestinal perforation), 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 P78.0: “neonatal peritonitis (P78.0-P78.1)”
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 | P78.0Perinatal intestinal perforation | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96) |
| Definition | Peritonitis is a non-billable ICD-10-CM category code (K65). | Perinatal intestinal perforation is a billable ICD-10-CM diagnosis code (P78.0). |
| Includes | — | Meconium peritonitis |
| Use additional code | code (B95-B97), to identify infectious agent, if known | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources