ICD-10 code K35 for Acute appendicitis is a medical classification as listed by WHO under the range -Diseases of appendix .
ICD-10-CM Code K35: Acute appendicitis and Related Diagnosis Codes. The ICD-10-CM (the International Classification of Diseases, Tenth Revision, Clinical Modification) is a standardized coding system used when classifying diseases and medical conditions.
Listed below are all Medicare Accepted ICD-10 codes under K35 for Acute appendicitis. These codes can be used for all HIPAA-covered transactions. ICD-10 code K35 is based on the following Tabular structure: This abbreviation in the Tabular List represents “other specified”.
2025 ICD-10-CM Codes K35 – Acute appendicitis (K35) Codes Description K35.2 Acute appendicitis with generalized peritonitis K35.3
Here are some commonly used codes for appendicits (do note that these are just some examples because there are a lot of codes): Almost all of these codes are for acute appendicitis, which is the sudden inflammation of the appendix.
K35 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity from the list below for a diagnosis of acute appendicitis. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions.
K35.31 - Acute appendicitis with localized peritonitis and gangrene, without perforation K35.32 - Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
With approximately 250,000 cases of acute appendicitis diagnosed annually in the United States, coding updates were made to ensure high-specificity coding could be achieved when reporting these diagnoses.