K65: Peritonitis
Codes under K65 (Peritonitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| K65.0 | Generalized (acute) peritonitis | ✓ |
| K65.0 | Generalized (acute) peritonitis | ✓ |
| K65.1 | Peritoneal abscess | ✓ |
| K65.1 | Peritoneal abscess | ✓ |
| K65.2 | Spontaneous bacterial peritonitis | ✓ |
| K65.2 | Spontaneous bacterial peritonitis | ✓ |
| K65.3 | Choleperitonitis | ✓ |
| K65.3 | Choleperitonitis | ✓ |
| K65.4 | Sclerosing mesenteritis | ✓ |
| K65.4 | Sclerosing mesenteritis | ✓ |
| K65.8 | Other peritonitis | ✓ |
| K65.8 | Other peritonitis | ✓ |
| K65.9 | Peritonitis, unspecified | ✓ |
| K65.9 | Peritonitis, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code K65?
K65 is an ICD-10-CM category covering Peritonitis. It contains 14 more specific diagnosis codes, 14 of which are billable.
Is K65 a billable code?
No — K65 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example K65.0 — Generalized (acute) peritonitis). 14 of the 14 codes under K65 are billable.
What codes fall under K65?
K65 includes K65.0, K65.0, K65.1, K65.1, K65.2, plus 9 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free