ICD-10-CM diagnosis code
K35.210 Acute appendicitis with generalized peritonitis, without perforation, with abscess
- Billable
- Yes, a complete code (FY2026)
- Category
- K35 Acute appendicitis
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Other codes in K35
13 complete codes in this category.
- 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
- K35.210Acute 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
- K35.30Acute 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
- K35.80Unspecified acute appendicitis
- K35.890Other acute appendicitis without perforation or gangrene
Documentation tips
- Make sure the note supports every element of the title, “Acute appendicitis with generalized peritonitis, without perforation, with abscess”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to K35.
The international WHO ICD-10 also has K35, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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