CPT 45309 Proctosigmoidoscopy — Reimbursement | OpenPayer

Summary & Overview

CPT 45309: Proctosigmoidoscopy with Snare Excision of Lesion

CPT code 45309 covers proctosigmoidoscopy with snare removal of a tumor, polyp, or other lesion using a rigid proctosigmoidoscope. Nationally, this code captures a common minimally invasive colorectal procedure used for diagnosis and therapeutic excision of distal colorectal lesions. Its use affects facility and physician billing patterns, care pathways for colorectal disease, and utilization of ambulatory surgery and endoscopy resources.

Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and common billing considerations. The publication summarizes benchmarks for utilization and reimbursement where available, notes coding and policy updates that affect coverage and payment, and outlines the clinical scope of the service to help coding, compliance, and revenue teams align documentation with billing.

This summary is intended for a national audience of clinicians, coders, and payer policy analysts seeking a clear reference on the clinical intent and billing implications of CPT code 45309. Data not available in the input.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 45309proctosigmoidoscopyendoscopycolorectal lesion removalsnare polypectomyambulatory surgeryphysician billingendoscopy suite

Billing Code Overview

CPT code 45309 describes a diagnostic and therapeutic proctosigmoidoscopy using a short rigid proctosigmoidoscope with visualization to the sigmoid colon, during which a tumor, polyp, or other lesion is removed using a snare technique. The procedure involves direct inspection of the anus, rectum, and sigmoid colon and an endoscopic excision of a lesion.

Service type: Endoscopic lesion removal (proctosigmoidoscopic snare excision)
Typical site of service: Ambulatory surgical center or hospital outpatient department; may also be performed in an endoscopy suite or physician office equipped for rigid proctosigmoidoscopy.

Clinical & Coding Specifications

Clinical Context

A 58-year-old patient with intermittent rectal bleeding and change in bowel habits is referred to colorectal surgery. After flexible sigmoidoscopy or anoscopic evaluation identifies a polyp or small neoplastic lesion within the distal sigmoid colon, rectum, or anal canal, the patient is scheduled for a proctosigmoidoscopy with transanal snare polypectomy (CPT 45309). The procedure is usually performed in an outpatient endoscopy suite or ambulatory surgical center under monitored anesthesia care or light general anesthesia. The provider introduces a rigid proctosigmoidoscope to visualize the distal rectum and sigmoid, identifies the lesion, deploys a snare via the instrument, and transects and retrieves the polyp or tumor for histopathology. Typical workflow steps include pre-procedure evaluation and informed consent, bowel preparation as indicated, anesthesia assessment, the endoscopic procedure with lesion removal, specimen labeling and submission to pathology, brief post-anesthesia recovery, and discharge with follow-up instructions and pathology review.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal, typically expected performance	Use when the service is the standard primary procedure without complications.

CPT 45337: Flexible Sigmoidoscopy with Decompression for Volvulus/Megacolon

CPT-45320-PROCTOSIGMOIDOSCOPIC-LESION-ABLATION

CPT 45320: Rigid Proctosigmoidoscopic Lesion Ablation

CPT-45307-PROCTOSIGMOIDOSCOPY-LOWER-GI-ENDOSCOPY

CPT 45307: Lower GI Proctosigmoidoscopy

45384-COLONOSCOPY-FLEXIBLE-PROXIMAL-TO-SPLENIC-FLEXURE-WITH

CPT 45384: Colonoscopy with Removal of Lesion by Hot Biopsy or Cautery

CPT-45346-FLEXIBLE-SIGMOIDOSCOPY-WITH-LESION-ABLATION

CPT 45346: Flexible Sigmoidoscopy with Lesion Ablation

CPT-45393-COLONOSCOPY-DECOMPRESSION-DILATED-COLON

CPT 45393: Flexible Colonoscopy with Colonic Decompression

45330-SIGMOIDOSCOPY-FLEXIBLE-DIAGNOSTIC-INCLUDING-COLLECTION-OF

CPT 45330: Flexible Sigmoidoscopy, Diagnostic Evaluation

CPT-45303-PROCTOSIGMOIDOSCOPY-WITH-STRICTURE-DILATION

CPT 45303: Proctosigmoidoscopy with Stricture Dilation

CPT-45347-SIGMOIDOSCOPY-WITH-ENDOSCOPIC-STENT-PLACEMENT

CPT 45347: Sigmoidoscopy with Endoscopic Stent Placement

CPT-45390-FLEXIBLE-COLONOSCOPY-MUCOSAL-EXCISION

CPT 45390: Flexible Colonoscopy with Mucosal Excision

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Taxonomy Code	Specialty	Notes
207X00000X	Colon & Rectal Surgery	Colorectal surgeons commonly perform transanal snare polypectomy for distal lesions.
208000000X	General Surgery	General surgeons with endoscopic skills perform proctosigmoidoscopy and polypectomy.
207L00000X	Gastroenterology	Gastroenterologists perform endoscopic lesion removal in the distal colon/rectum.
363L00000X	Surgical Oncology	Surgical oncologists may perform lesion excision when malignancy is suspected.
2086S0124X	Family Medicine with Obstetrics	Data not available in the input.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K62.5`	Hemorrhage of anus and rectum	Indicates rectal bleeding prompting evaluation and possible polypectomy.
`K62.0`	Anal fissure	May be a concurrent anorectal symptom leading to proctologic evaluation.
`K62.3`	Rectal prolapse	May require visual assessment of distal rectum during proctosigmoidoscopy.
`K63.5`	Polyp of colon	Direct indication for polypectomy of distal colonic or rectal polyps.
`D12.6`	Benign neoplasm of rectum	Benign tumor resection target for snare polypectomy.
`C20`	Malignant neoplasm of rectum	Lesions suspicious for malignancy may be biopsied or removed for pathology.
`K50.90`	Crohn's disease, unspecified, without complications	Inflammatory conditions may produce lesions or polyps requiring evaluation.
`K51.90`	Ulcerative colitis, unspecified, without complications	Chronic colitis surveillance may include removal of dysplastic polyps.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`45330`	Flexible sigmoidoscopy, with biopsy, when performed	Often used for diagnosis or surveillance prior to rigid proctosigmoidoscopic snare removal.
`45380`	Colonoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)	Performed when more proximal colonic evaluation is needed in the same episode of care.
`45385`	Colonoscopy with removal of tumor(s), polyp(s), or other lesion(s) by snare technique	Analogous snare polypectomy for more proximal lesions using flexible colonoscope.
`45320`	Anoscopy; diagnostic, including collection of specimen(s) by brushing or washing	Often performed as an initial shorter exam for anorectal complaints before `CPT 45309`.
`99024`	Postoperative follow-up visit, related to the procedure during the global period	Used for routine post-procedure follow-up and pathology review.

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