ICD-10 Code K38.8 – Other specified diseases of appendix (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K38.8 – Other specified diseases of appendix
What it is
K38.8 identifies appendix disorders that are documented but do not fit a more specific ICD-10 category. Use it when the provider names an unusual or otherwise specified appendiceal condition.
Clinical signs
Clinical features vary; refer to documentation. Findings may include right lower quadrant pain, tenderness, or imaging and operative descriptions showing an appendiceal abnormality that is not acute appendicitis.
When to use this code
Use K38.8 when the record clearly states a specific appendiceal disease and no more precise code exists. It may apply to pathology, surgical, or imaging reports that describe an appendix condition by name.
Choose this code only after confirming the documented diagnosis is not better represented by acute appendicitis, appendiceal abscess, or another established appendix code. Check documentation if the wording is vague.
Do not use for
Do not use K38.8 for acute appendicitis or appendiceal abscess, which have their own codes. Avoid it when the chart only says “appendix pain” or gives an unspecified abdominal complaint.
Coding tip
Code the exact appendix condition stated in the note, and query the provider if the documentation does not clearly identify a specific disease.