Diseases of appendix (K35-K38)
chapter 11: Diseases of the Digestive System
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
There are no chapter-specific rules for Chapter 11 yet, so the general rules in Section I.B apply.
All codes under K35-K38
K35-K38 can't be used on a claim. Pick a billable code below; grey headings group them.
- K35Acute appendicitis
- K35.2Acute appendicitis with generalized peritonitis
- K35.20Acute appendicitis with generalized peritonitis, without abscess
- K35.200Acute appendicitis with generalized peritonitis, without perforation or abscess
- K35.201Acute appendicitis with generalized peritonitis, with perforation, without abscess
- K35.209Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation
- K35.21Acute appendicitis with generalized peritonitis, with abscess
- K35.210Acute appendicitis with generalized peritonitis, without perforation, with abscess
- K35.211Acute appendicitis with generalized peritonitis, with perforation and abscess
- K35.219Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation
- K35.3Acute appendicitis with localized peritonitis
- K35.30Acute appendicitis with localized peritonitis, without perforation or gangrene
- K35.31Acute appendicitis with localized peritonitis and gangrene, without perforation
- K35.32Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
- K35.33Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
- K35.8Other and unspecified acute appendicitis
- K35.80Unspecified acute appendicitis
- K35.89Other acute appendicitis
- K35.890Other acute appendicitis without perforation or gangrene
- K35.891Other acute appendicitis without perforation, with gangrene
- K36Other appendicitis
- K37Unspecified appendicitis
- K38Other diseases of appendix
- K38.0Hyperplasia of appendix
- K38.1Appendicular concretions
- K38.2Diverticulum of appendix
- K38.3Fistula of appendix
- K38.8Other specified diseases of appendix
- K38.9Disease of appendix, unspecified
K35-K38 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Appendicitis
The appendix is a small, tube-like organ attached to the first part of the large intestine. It is located in the lower right part of the abdomen. It has no known function. A blockage inside of the appendix causes appendicitis. The blockage leads to increased pressure, problems with blood flow, and inflammation. If the blockage is not treated, the appendix can burst and spread infection into the abdomen. This causes a condition called peritonitis.
Read more about appendicitis on MedlinePlus