K65
Non-billablePeritonitis
Peritonitis
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- •acute appendicitis with generalized peritonitisK35.2
- •aseptic peritonitisT81.6
- •benign paroxysmal peritonitisE85.0
- •chemical peritonitisT81.6
- •gonococcal peritonitisA54.85
- •neonatal peritonitisP78.0-P78.1
- •pelvic peritonitis, femaleN73.3-N73.5
- •periodic familial peritonitisE85.0
- •peritonitis due to talc or other foreign substanceT81.6
- •peritonitis in chlamydiaA74.81
- •peritonitis in diphtheriaA36.89
- •peritonitis in syphilis (late)A52.74
- •peritonitis in tuberculosisA18.31
- •peritonitis with or following abortion or ectopic or molar pregnancy,O00-O07, O08.0
- •peritonitis with or following appendicitisK35
- •puerperal peritonitisO85
- •retroperitoneal infectionsK68
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
Use Additional Code
Additional codes that should follow this code
Code Also
A second code may be required; sequencing depends on circumstances
Child Codes (7)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(7)
Frequently Asked Questions
What is the ICD-10 code for peritonitis?
The ICD-10-CM code for peritonitis is K65. The full clinical description is "Peritonitis". K65 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code K65 mean?
ICD-10-CM code K65 represents “Peritonitis”. It is classified under Chapter 11: Diseases of the Digestive System and is a non-billable header code. Use a more specific child code for billing purposes.
Is K65 a billable code?
No, K65 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 7 child codes under K65.
What chapter is K65 in?
K65 is in Chapter 11: Diseases of the Digestive System (codes K00-K95).
What codes cannot be used with K65?
K65 has Excludes1 notes indicating codes that cannot be used together with it, including: acute appendicitis with generalized peritonitis (K35.2-); aseptic peritonitis (T81.6); benign paroxysmal peritonitis (E85.0); and 14 more.
What are the subcategories under K65?
K65 has 7 child codes, including: K65.0 (Generalized (acute) peritonitis), K65.1 (Peritoneal abscess), K65.2 (Spontaneous bacterial peritonitis), K65.3 (Choleperitonitis), and 3 more.
Are additional codes required with K65?
Yes, when using K65, also report: code (B95-B97), to identify infectious agent, if known.
What are the UMLS CUIs for K65?
K65 is linked to 1 UMLS Concept Unique Identifier: C0031154. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does K65 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like peritonitis affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of K65?
K65 maps to the ICD-11 code: DC50.Z (Peritonitis, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.