ICD-10 Code K38.0 – Hyperplasia of appendix (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K38.0 – Hyperplasia of appendix
What it is
K38.0 identifies hyperplasia of the appendix, meaning an abnormal increase in tissue growth within the appendix. Use it when documentation specifically states this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may be incidental or associated with appendiceal enlargement, but the code is based on the documented diagnosis rather than symptoms alone.
When to use this code
Use K38.0 when the provider documents hyperplasia of the appendix as the confirmed condition. It may appear in pathology, imaging, or operative documentation when the appendix is described as hyperplastic. If the record only says appendiceal abnormality or mass, check documentation before coding.
Do not use for
Do not use this code for acute appendicitis, appendiceal neoplasm, or nonspecific abdominal pain. If the chart does not clearly identify hyperplasia, check documentation.
Coding tip
Code K38.0 only when the provider explicitly documents hyperplasia of appendix.