ICD-10 Code D13.91 – Familial adenomatous polyposis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D13.91 – Familial adenomatous polyposis
What it is
Familial adenomatous polyposis is an inherited condition that causes many adenomatous polyps to develop in the colon and rectum. It is a high-risk precancerous disorder and usually requires ongoing surveillance.
Clinical signs
Patients often have numerous colorectal polyps, a strong family history, or genetic confirmation of an APC-related syndrome. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents familial adenomatous polyposis, including classic or attenuated forms. You may also use it when the provider identifies FAP as the reason for surveillance, genetic counseling, or colorectal evaluation. Check documentation if the note only mentions a family history of polyps without a confirmed diagnosis.
Do not use for
Do not use this code for sporadic colorectal polyps, isolated adenomas, or nonspecific family history alone. If the diagnosis is uncertain or not stated, check documentation.
Coding tip
Code the confirmed hereditary disorder, not the screening procedure or family history, unless the provider documents FAP.