CPT code 46604 denotes an anoscopy combined with dilation of the anal canal and is used for both diagnostic inspection and therapeutic enlargement of a narrowed anal opening. Nationally, this code captures a common minor procedural intervention in colorectal and general surgery practices, proctology clinics, and outpatient procedural units. Proper use of the code supports clinical documentation of procedural findings and the medical necessity of dilation.

Key payers included in the coverage context are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines payer coverage patterns, billing and coding considerations, typical sites of service, and clinical context for indications that commonly prompt anoscopic dilation.

Readers will find concise benchmarks for where this service is typically delivered, guidance on documentation elements to support coding, and a clinical summary describing when anoscopy with dilation is performed. Data not available in the input is noted where payer-specific policies or fee benchmarks would normally appear.