CPT 46505 Anal Sphincter Chemodenervation Reimbursement | OpenPayer

Summary & Overview

CPT 46505: Anal Sphincter Chemodenervation

CPT code 46505 denotes chemodenervation of the anal sphincter, a targeted injectable procedure used to interrupt neural signaling and relieve sphincter spasm. Nationally, this code represents a specialized therapeutic intervention in colorectal and proctologic care that affects ambulatory surgical and outpatient procedural billing. The code is relevant to hospital outpatient departments, ambulatory surgical centers, and clinic-based procedural billing pathways.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise briefing on clinical context, common sites of service, and the administrative framing of the procedure. The publication provides benchmarks and coding context for reimbursement and utilization, highlights typical payer considerations and coding nuances, and summarizes implications for practice workflows and administrative review.

The report outlines: the clinical purpose of CPT code 46505, typical settings where the procedure occurs, payer coverage patterns and benchmarks, and any recent policy or coding considerations that affect billing and claims adjudication. Data not available in the input will be noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare46505CPTchemodenervationanal sphincterprocedural codingcolorectal procedureoutpatient surgeryinjectable therapy

Billing Code Overview

CPT code 46505 describes a chemodenervation of the anal sphincter, a procedure in which a provider injects a therapeutic agent into the anal sphincter muscle to interrupt nerve signaling and relieve sphincter spasm. The procedure is delivered to the anal sphincter, a muscular ring surrounding the tip of the anus.

Service type: Therapeutic chemodenervation (injective procedure)
Typical site of service: Ambulatory surgical center or outpatient procedure room (office or clinic-based procedure)

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult presenting to an outpatient colorectal surgery or gastroenterology clinic with chronic internal anal sphincter hypertonicity or persistent anal fissure refractory to conservative therapy. The patient reports severe anal pain with bowel movements despite stool softeners, topical nitrates or calcium channel blockers, and Sitz baths. After clinical assessment and exclusion of infection, inflammatory bowel disease, or malignancy, the provider recommends chemodenervation of the internal anal sphincter to reduce resting tone and promote fissure healing.

The clinical workflow: the patient is scheduled in an ambulatory procedure room or endoscopy suite. Pre-procedure evaluation includes consent, review of anticoagulation, and brief history and focused exam. The provider administers local anesthesia as needed, then injects botulinum toxin into one or more quadrants of the anal sphincter under direct visualization or palpation. The patient is monitored briefly for adverse effects and discharged with post-procedure instructions and follow-up to assess symptom improvement and wound healing. Typical site of service is an ambulatory surgical center or physician office procedure room.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal, postoperative care included	Use when the service is the usual, expected service by the performing provider without unusual circumstances.

CPT 46500: Injection Sclerotherapy for Hemorrhoid

Taxonomy Code	Specialty	Notes
`207P00000X`	Colon and Rectal Surgery	Most common specialty performing anal sphincter chemodenervation.
`208000000X`	Gastroenterology	Performs chemodenervation in clinic or endoscopy suite for fissures and sphincter spasm.
`2086S0122X`	Family Medicine	May perform injection in office settings when trained.
`207L00000X`	General Surgery	Performs procedure as part of anorectal surgical care.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K60.2`	Anal fissure, chronic	Primary indication for anal sphincter chemodenervation to reduce sphincter hypertonicity and promote fissure healing.
`K60.0`	Acute anal fissure	May be treated with conservative measures first; chemodenervation considered for persistent symptoms.
`K62.5`	Fissure and fistula of anal and rectal regions, unspecified	Clinical relevance when fissure persists and conservative therapy fails; further evaluation required.
`I84.9`	Hemorrhoids, unspecified	Coexisting anorectal pain or spasm may prompt assessment; treatment pathways differ but may coincide in evaluation.
`R15.9`	Full incontinence of feces, unspecified	Sphincter dysfunction assessment is necessary; chemodenervation typically contraindicated in major incontinence but relevant in differential diagnosis.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`46600`	Examination of anus and rectum, anoscopy; diagnostic	Performed before or during evaluation to visualize fissure or sphincter pathology.
`45330`	Flexible endoscopy of the colon; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)	May be performed in diagnostic workup if distal colon or inflammatory disease needs evaluation prior to intervention.
`99152`	Moderate sedation services provided by the same physician performing the procedure, initial 15 minutes (Note: example of conscious sedation reporting; check payer guidance)	Used when moderate sedation is provided during the procedure and must be reported per payer rules.
`99070`	Supplies and materials (except for drugs, devices, and biologicals) provided by the physician over and above those usually included with the procedure	Used to report additional disposable supplies or specialized injectables when payer allows.
`J0585`	Injection, onabotulinumtoxinA, 1 unit	Reported for billing the specific botulinum toxin units used for chemodenervation when applicable and supported by payer policy.

OpenPayer