All ICD10 Codes

K65

Non-Billable
ChapterK00–K95
Rankcategory
Official Description

Peritonitis

Use a more specific code (7 billable)
K65.0Generalized (acute) peritonitisK65.1Peritoneal abscessK65.2Spontaneous bacterial peritonitisK65.3CholeperitonitisK65.4Sclerosing mesenteritisK65.8Other peritonitisK65.9Peritonitis, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 11: Diseases of the Digestive System (K00-K95).

CH11 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

Instructional Notes

Excludes1(Not coded here. Use a different 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.-)
Code Also
  • if applicable diverticular disease of intestine (K57.-)
Use Additional Code
  • code (B95-B97), to identify infectious agent, if known

Clinical Hierarchy

BillableHas subcodes
CH11Diseases of the digestive system (K00-K95)
K65-K68Diseases of peritoneum and retroperitoneum (K65-K68)
K65PeritonitisNot billable
K65.0Generalized (acute) peritonitisBillable
K65.1Peritoneal abscessBillable
K65.2Spontaneous bacterial peritonitisBillable
K65.3CholeperitonitisBillable
K65.4Sclerosing mesenteritisBillable
K65.8Other peritonitisBillable
K65.9Peritonitis, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to K65:

chapterCH11
Diseases of the digestive system (K00-K95)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Peritonitis.

Search PCS Codes