K65 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Peritonitis.
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If applicable diverticular disease of intestine (K57.-)
Code (B95-B97), to identify infectious agent, if known
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.-)
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