K65
K65: Peritonitis
Non-billable headerICD-10-CM
K65 is a non-billable header ICD-10-CM code for peritonitis. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- 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
Add a secondary code to capture the detail described below.
Code also
Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.
- if applicable diverticular disease of intestine (K57.-)
Other codes that can never be billed with K65
Their own Excludes1 notes name this code, so the conflict is not listed above.
- K65.2Spontaneous bacterial peritonitis
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead K65
7 child codes. Green means billable.