K65Non-billableSave
K65 - Peritonitis
ICD-10-CM Chapter 11: Diseases of the digestive system · K65-K6A Diseases of peritoneum, retroperitoneum and pelvis (K65-K6A) · Top-level category · FY2027
Coding Guidance
K65 is a non-billable heading. Report one of the 7 more specific codes below.
Includes, Excludes and Coding Notes
Excludes 1 — Not Coded HereFrom K65
Mutually exclusive: these conditions are never reported together with this code.
- 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 CodeFrom K65
Add a secondary code to identify the associated condition or cause when it is documented.
- code (B95-B97), to identify infectious agent, if known
Code AlsoFrom K65
Report an additional code when both conditions apply.
- if applicable diverticular disease of intestine (K57.-)
Excludes 2 — Not Included HereFrom Chapter K00-K95
Not part of this code; report both codes when the patient has both conditions.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
More Specific Codes (7)
Related condition guides
Documentation requirements, coding pitfalls and FAQs for conditions coded with K65.
Chapter Information
Related ICD-10 Codes
More specific codes for K65
Other categories in this chapter
Codes at the same level as K65
- Disorders of tooth development and eruptionK00
- Embedded and impacted teethK01
- Dental cariesK02
- Other diseases of hard tissues of teethK03
- Diseases of pulp and periapical tissuesK04
- Gingivitis and periodontal diseasesK05
- Other disorders of gingiva and edentulous alveolar ridgeK06
- Other disorders of teeth and supporting structuresK08
- Cysts of oral region, not elsewhere classifiedK09
- Diseases of salivary glandsK11
- Stomatitis and related lesionsK12
- Other diseases of lip and oral mucosaK13
- Diseases of tongueK14
- EsophagitisK20
- Gastro-esophageal reflux diseaseK21
- Other diseases of esophagusK22
- Disorders of esophagus in diseases classified elsewhereK23
- Gastric ulcerK25
- Duodenal ulcerK26
- Peptic ulcer, site unspecifiedK27
- Gastrojejunal ulcerK28
- Gastritis and duodenitisK29
- Functional dyspepsiaK30
- Other diseases of stomach and duodenumK31
- Acute appendicitisK35
- Other appendicitisK36
- Unspecified appendicitisK37
- Other diseases of appendixK38
- Inguinal herniaK40
- Femoral herniaK41
- Umbilical herniaK42
- Ventral herniaK43
- Diaphragmatic herniaK44
- Other abdominal herniaK45
- Unspecified abdominal herniaK46
- Crohn's disease [regional enteritis]K50
- Ulcerative colitisK51
- Other and unspecified noninfective gastroenteritis and colitisK52
- Vascular disorders of intestineK55
- Paralytic ileus and intestinal obstruction without herniaK56
32 more in this chapter.