ICD-10 Code K38 – Other diseases of appendix (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K38 – Other diseases of appendix
What it is
K38 identifies diseases of the appendix that are not classified elsewhere. Use it when the provider documents an appendiceal disorder, but the record does not support a more specific ICD-10-CM code.
Clinical signs
Clinical features vary; refer to documentation. Appendiceal disease may present with right lower quadrant pain, tenderness, fever, or other abdominal symptoms, depending on the specific condition involved.
When to use this code
Use K38 when the diagnosis is clearly an appendiceal condition and no more specific code applies. It is appropriate for documented disorders of the appendix that do not fit appendicitis, rupture, or other defined categories. If the chart names the condition but lacks detail, code the documented appendiceal disease rather than guessing.
Do not use for
Do not use K38 for acute appendicitis, perforated appendix, or postoperative complications with a different stated diagnosis. Check documentation if the provider specifies a more precise appendiceal disorder.
Coding tip
Look for the exact appendiceal diagnosis in the note; if a specific code exists, choose it instead of K38.