AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2023 Issue 4; New/Revised ICD-10-CM Codes

Familial Adenomatous Polyposis and Benign Neoplasm of Ill-Defined Sites of Digestive System

Code D13.9, Benign neoplasm of ill-defined sites within the digestive system, was expanded to create codes D13.91, Familial adenomatous polyposis, and D13.99, Benign neoplasm of ill-defined sites within the digestive system.Familial adenomatous polyposis (FAP) is a rare inherited cancer predisposition syndrome characterized by hundreds to thousands of precancerous colorectal polyps (adenomatous polyps). There are three types of FAP: classic, attenuated, and autosomal recessive. The classic and attenuated types are caused by mutations in the adenomatous polyposis coli (APC) gene. The autosomal recessive type is caused by mutations in the MUTYH gene, which is also known...

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