CPT 45500 Anorectal Stenosis Repair Reimbursement | OpenPayer

Summary & Overview

CPT 45500: Release of Anorectal Stenosis with Flap Repair

CPT code 45500 denotes a surgical repair to release anorectal stenosis by incising scar tissue and reconstructing the area with adjacent tissue flaps. This code represents a specialized anorectal reconstructive procedure used to relieve symptomatic narrowing of the anal canal that can impair bowel function. Nationally, accurate coding for this procedure matters for clinical tracking, care coordination, and payment consistency across surgical and ambulatory settings.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of the clinical context for 45500, expected sites of service, common modifiers used with surgical CPT codes, and what to expect in payer coverage discussions. The content outlines benchmarking and policy considerations relevant to hospitals, ambulatory surgical centers, and colorectal surgery practices.

This publication provides a practical reference for clinicians, coding professionals, and revenue cycle staff seeking clarity on when 45500 applies, typical clinical indications, and how the procedure fits into surgical service lines. Data not available in the input will be noted where necessary.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare45500CPTanorectal surgeryreconstructive surgerysurgical codingambulatory surgeryoperating roomcolorectal

Billing Code Overview

CPT code 45500 describes a surgical procedure to release an anorectal stenosis by incising scar tissue and repairing the defect using local tissue flaps. This procedure addresses narrowing or obstruction of the anorectal canal caused by scarring and is performed to restore patency and function.

Service type: Surgical — anorectal reconstructive procedure
Typical site of service: Operating room or ambulatory surgical center, under appropriate anesthesia

Clinical & Coding Specifications

Clinical Context

A typical patient is a 45–65-year-old adult with symptomatic anorectal stenosis presenting with progressive difficulty with defecation, painful or incomplete bowel movements, recurrent fecal impaction, perianal pain, and possible bleeding. Common antecedents include prior hemorrhoidectomy, fissure surgery, radiation therapy to the pelvis, Crohn disease with perianal surgery, or repeat anorectal procedures leading to cicatricial narrowing. The clinical workflow begins with history and focused anorectal examination, including anoscopy and digital rectal exam, and may include endoanal ultrasound or flexible sigmoidoscopy to assess stricture length and any concurrent pathology. Nonoperative measures (bowel regimen, dilators) are often attempted first. When conservative therapy fails or the stenosis is severe, the surgeon schedules operative release under appropriate anesthesia in an ambulatory surgery center or hospital operating room. In the procedure described by 45500, the surgeon incises scar tissue to release the stenosis and reconstructs the defect using adjacent tissue flaps to widen the anal canal and restore function. Postoperative care includes wound care, stool softeners, pain control, and follow-up to assess healing and function. Typical sites of service are the hospital outpatient operating room or ambulatory surgery center; inpatient admission is uncommon unless comorbidities or complications require it.

Coding Specifications

Modifier	Description	When to Use
`00`

CPT 45505: Excision of Prolapsed Rectal Mucosa with Flap Repair

CPT-45541-PERINEAL-RECTAL-PROLAPSE-REPAIR-MESH-SUTURES

CPT 45541: Perineal Rectal Prolapse Repair with Mesh and Sutures

CPT-45562-RECTAL-REPAIR-PRESACRAL-DRAINAGE

CPT 45562: Exploratory Rectal Repair with Presacral Drainage

CPT-45805-RECTOVESICAL-FISTULA-REPAIR-WITH-SIGMOID-COLOSTOMY

CPT 45805: Rectovesical Fistula Repair with Sigmoid Colostomy

CPT-45563-RECTAL-INJURY-REPAIR-SIGMOID-COLOSTOMY

CPT 45563: Rectal Injury Repair with Sigmoid Colostomy

CPT-45560-RECTOCELE-REPAIR-VAGINAL

CPT 45560: Rectocele Repair (Vaginal)

CPT-45550-RECTOPEXY-WITH-SIGMOID-RESECTION

CPT 45550: Open Rectopexy with Sigmoid Resection

CPT-45540-ABDOMINAL-RECTOPEXY-RECTAL-PROLAPSE-MESH-SUTURE

CPT 45540: Abdominal Rectopexy for Rectal Prolapse

CPT-45825-RECTOURETHRAL-FISTULA-CLOSURE-WITH-SIGMOID-COLOSTOMY

CPT 45825: Rectourethral Fistula Closure with Sigmoid Colostomy

CPT-45520-RECTAL-SCLEROTHERAPY-FOR-PROLAPSED-MUCOSA

CPT 45520: Injection of Sclerosant for Prolapsed Rectal Mucosa

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Taxonomy Code	Specialty	Notes
`207L00000X`	Colon and Rectal Surgery	Primary specialty performing anorectal reconstructive procedures.
`208000000X`	General Surgery	Common provider for anorectal stenosis release in many hospitals and ASCs.
`2086S0122X`	Gastroenterology Surgery (Surgical sub-specialty of gastroenterology)	Performs surgical anorectal procedures in some centers.
`207K00000X`	Proctology (subset of coloproctology)	Focused specialty in anorectal disease and reconstructive techniques.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K60.3`	Anal fissure, unspecified	Chronic fissure and prior operative treatment can lead to scarring and resultant stenosis.
`K62.5`	Anal stenosis	Direct diagnosis indicating narrowing of the anal canal and the primary indication for `45500`.
`K51.90`	Ulcerative colitis, unspecified, without complications	Inflammatory bowel disease with prior anorectal surgery or chronic inflammation can lead to scarring and stenosis.
`K50.90`	Crohn's disease, unspecified, without complications	Perianal Crohn disease and surgeries may result in cicatricial strictures requiring surgical release.
`Z98.890`	Other specified postprocedural states	Indicates prior anorectal procedures or surgical history relevant to stenosis formation.
`C79.5`	Secondary malignant neoplasm of large intestine and rectum	Prior pelvic malignancy and radiation therapy may cause radiation-induced strictures requiring flap reconstruction.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`45110`	Excision, lesion of perianal skin and subcutaneous tissue	Performed for local skin lesions or scar excision adjacent to a stenosis as part of exposure or debridement.
`45330`	Sigmoidoscopy, flexible; diagnostic, including collection of specimen by brushing or washing, when performed (separate procedure)	Used preoperatively to evaluate distal rectal mucosa and exclude other pathology prior to definitive stenosis repair.
`44140`	Colectomy, partial; with anastomosis	Rarely performed concurrently if extensive disease or stricture extends higher requiring segmental resection.
`46255`	Fistulectomy, complex, or fistulotomy with repair (note: example of perianal reconstruction)	Related reconstructive techniques for complex perianal disease that may coexist and require combined operative planning.
`99499`	Unlisted evaluation and management service	May be used for nonstandard preoperative or postoperative management not captured by established codes.

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