ICD-10 Code K35.890 – Other acute appendicitis without perforation or gangrene (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K35.890 – Other acute appendicitis without perforation or gangrene
What it is
K35.890 identifies acute appendicitis that is not described by a more specific appendicitis code and has no perforation or gangrene. Use it when the record confirms acute appendicitis, but not rupture or tissue death.
Clinical signs
Typical findings include right lower quadrant abdominal pain, tenderness, and signs of acute abdominal inflammation. Clinical features vary; refer to documentation for the exact presentation and whether perforation or gangrene is absent.
When to use this code
Use this code when the provider documents acute appendicitis and specifically states it is other acute appendicitis without perforation or gangrene. It also fits when the chart does not support a more specific appendicitis subtype. Check documentation if the note mentions rupture, abscess, or gangrene.
Do not use for
Do not use K35.890 if the record shows perforation, gangrene, or a different appendicitis category. Do not assign it when documentation only says abdominal pain or suspected appendicitis without confirmation.
Coding tip
Match the code to the provider’s exact wording and confirm that perforation and gangrene are both ruled out.