2022 ICD-10-CM Codes for Peritonitis (K65)

Instructional Notations

Code Also Code Also
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.

  • if applicable diverticular disease of intestine K57

Use Additional Code Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

Type 1 Excludes Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • 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