Summary & Overview
CPT 46604: Anoscopy with Anal Dilation
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.
Billing Code Overview
CPT code 46604 describes an anoscopy with dilation of the anal canal. The procedure involves examination of the anus using a small, rigid, tubular instrument called an anoscope, combined with dilation of any narrowing of the anal cavity using devices such as a balloon, guidewire, or bougie.
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Service type: Diagnostic and therapeutic anoscopy with anal dilation
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Typical site of service: Ambulatory surgical center, hospital outpatient department, or physician office procedural suite
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting to an outpatient colorectal clinic or gastroenterology office with symptoms of anorectal pain, bleeding, difficulty with defecation, or a history of anal stenosis following hemorrhoidectomy or radiation. The provider performs an anoscopy using a small rigid anoscope to directly visualize the anal canal and distal rectum. If a stricture or narrowing is identified, the provider mechanically dilates the anal canal using a bougie, balloon dilator, or guidewire-assisted technique under direct visualization. Local anesthesia or topical anesthetic may be applied; conscious sedation is uncommon but may be used for patient comfort. The workflow includes pre-procedure assessment and consent, position the patient in left lateral or prone jackknife position, perform anoscopy and inspection, therapeutically dilate any identified narrowing, document findings and dilation method, provide postprocedure instructions, and arrange follow-up care. Typical sites of service are outpatient clinic, ambulatory surgery center, or hospital outpatient department depending on patient comorbidities and need for sedation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Primary procedure | Use when 46604 is the main service performed during the encounter. |