ICD-10-CM · Chapter 11 · K00-K95
K65 Peritonitis
Excludes 1 (cannot be coded together)
- acute appendicitis with generalized peritonitis (K35.2-)
- aseptic peritonitis (T81.6)
- benign paroxysmal peritonitis (E85.0)
- chemical peritonitis (T81.6)
- gonococcal peritonitis (A54.85)
- neonatal peritonitis (P78.0-P78.1)
- pelvic peritonitis, female (N73.3-N73.5)
- periodic familial peritonitis (E85.0)
- peritonitis due to talc or other foreign substance (T81.6)
- peritonitis in chlamydia (A74.81)
- peritonitis in diphtheria (A36.89)
- peritonitis in syphilis (late) (A52.74)
- peritonitis in tuberculosis (A18.31)
- peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0)
- peritonitis with or following appendicitis (K35.-)
- puerperal peritonitis (O85)
- retroperitoneal infections (K68.-)
Use Additional Code
- code (B95-B97), to identify infectious agent, if known
Code Also
- if applicable diverticular disease of intestine (K57.-)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| K65..0 | Generalized (acute) peritonitis | Yes |
| K65..1 | Peritoneal abscess | Yes |
| K65..2 | Spontaneous bacterial peritonitis | Yes |
| K65..3 | Choleperitonitis | Yes |
| K65..4 | Sclerosing mesenteritis | Yes |
| K65..8 | Other peritonitis | Yes |
| K65..9 | Peritonitis, unspecified | Yes |
Last reviewed: September 2026