Coding and coverage · ICD-10-CM
K35.3 Acute appendicitis with localized peritonitis
Report one of the more specific codes below.
Codes under this one
- K35.30 Acute appendicitis with localized peritonitis, without perforation or gangrene
- K35.31 Acute appendicitis with localized peritonitis and gangrene, without perforation
- K35.32 Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
- K35.33 Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
Instructional notes
Chapter 11
Excludes2Not included here: the patient may have both; report both when both are present.
- 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)
Chapter 11: Diseases of the digestive system · K35-K38 Diseases of appendix (K35-K38)
Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.
Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.