K65

Non-billable

Peritonitis

K65 is the ICD-10-CM code for Peritonitis. It is a non-billable category code — use a more specific child code such as K65.0 for billing.

Status
Header (non-billable)
Chapter
K00-K95
Subcodes
7
Edition
FY2026

K00-K95 Diseases of the digestive system

Excludes1 — not coded here

  • 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

Notes

  • if applicable diverticular disease of intestine (K57.-)

Frequently asked questions

What is ICD-10 code K65?
K65 is the ICD-10-CM code for "Peritonitis". It falls under K00-K95 Diseases of the digestive system.
Is K65 a billable code?
No — K65 is a non-billable header code. Use a more specific child code (such as K65.0) for billing.
What are the subcodes of K65?
K65 has 7 more specific child codes, including K65.0, K65.1, K65.2.
What is excluded from K65?
Excludes1 (not coded here): acute appendicitis with generalized peritonitis (K35.2-); aseptic peritonitis (T81.6); benign paroxysmal peritonitis (E85.0); chemical peritonitis (T81.6).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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