ICD-10 Code K35.31 - Acute appendicitis with localized peritonitis and gangrene, without perforation

ICD-10-CM Diagnosis Code K35.31

Diagnosis Code: K35.31 (Raw: K3531)

Description: Acute appendicitis with localized peritonitis and gangrene, without perforation

Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)

Fiscal Year: 2026

CMS Section 111 Status: Valid for reporting.

Overview & Clinical Details

ICD-10-CM code K35.31 is designated for Acute appendicitis with localized peritonitis and gangrene, without perforation. In medical documentation and insurance billing, this code is utilized to specify medical diagnosis for patient records, reimbursement workflows, and compliance under CMS Section 111 mandatory insurer reporting guidelines.