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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.

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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.

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CPT 45309: Proctosigmoidoscopy with Snare Excision of Lesion

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Billing Code Overview

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.
`22`	Increased procedural services	Use when the procedure required significantly greater effort, time, or technical difficulty than usual.
`52`	Reduced services	Use when the procedure was partially reduced or not completed as originally planned.
`53`	Discontinued procedure	Use when the procedure was started but terminated due to patient condition or unforeseen circumstances.
`59`	Distinct procedural service	Data not available in the input.
`62`	Two surgeons	Use when a second surgeon with distinct skills actively participates in the procedure.
`66`	Team surgical procedure	Use when a surgical team performs the procedure under a documented team model.
`73`	Discontinued outpatient facility procedure prior to anesthesia	Use when the procedure is discontinued before anesthesia induction.
`78`	Return to the OR for related procedure during postoperative period	Use when a related unplanned return to the operating room occurs.
`80`	Assistant surgeon	Use when a surgical assistant performs a defined assisting role.
`81`	Minimum assistant surgeon	Use when minimal assistant involvement is documented.
`26`	Professional component	Use when only the physician component of a service is billed separate from technical component.
`TC`	Technical component	Use when only the technical component (facility or equipment) is billed.
`52`	Reduced services	Use when circumstances require that the full service not be rendered (listed for emphasis).

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.

CPT 45300: Diagnostic Proctosigmoidoscopy, Rigid

CPT-45303-PROCTOSIGMOIDOSCOPY-WITH-STRICTURE-DILATION

CPT 45303: Proctosigmoidoscopy with Stricture Dilation

CPT-45305-PROCTOSIGMOIDOSCOPY-WITH-BIOPSY

CPT 45305: Proctosigmoidoscopy with Biopsy

CPT-45307-PROCTOSIGMOIDOSCOPY-LOWER-GI-ENDOSCOPY

CPT 45307: Lower GI Proctosigmoidoscopy

CPT-45308-PROCTOSIGMOIDOSCOPIC-LESION-REMOVAL

CPT 45308: Proctosigmoidoscopic Removal of Single Lesion

CPT-45315-PROCTOSIGMOIDOSCOPIC-POLYPECTOMY-MULTIPLE-LESIONS

CPT 45315: Proctosigmoidoscopic Removal of Multiple Lesions

CPT-45317-PROCTOSIGMOIDOSCOPY-WITH-HEMOSTASIS

CPT 45317: Proctosigmoidoscopy with Hemostasis

CPT-45320-PROCTOSIGMOIDOSCOPIC-LESION-ABLATION

CPT 45320: Rigid Proctosigmoidoscopic Lesion Ablation

CPT-45321-PROCTOSIGMOIDOSCOPIC-DECOMPRESSION-SIGMOID-VOLVULUS

CPT 45321: Proctosigmoidoscopic Decompression of Sigmoid Volvulus

CPT-45327-PROCTOSIGMOIDOSCOPIC-STENT-PLACEMENT-FOR-RECTAL-SIGMOID-STRICTURE

CPT 45327: Proctosigmoidoscopic Placement of Colorectal Stent

Showing 1–10 of 39

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`11`	Normal, typically expected performance	Use when the service is the standard primary procedure without complications.
`22`	Increased procedural services	Use when the procedure required significantly greater effort, time, or technical difficulty than usual.
`52`	Reduced services	Use when the procedure was partially reduced or not completed as originally planned.
`53`	Discontinued procedure	Use when the procedure was started but terminated due to patient condition or unforeseen circumstances.
`59`	Distinct procedural service	Data not available in the input.
`62`	Two surgeons	Use when a second surgeon with distinct skills actively participates in the procedure.
`66`	Team surgical procedure	Use when a surgical team performs the procedure under a documented team model.
`73`	Discontinued outpatient facility procedure prior to anesthesia	Use when the procedure is discontinued before anesthesia induction.
`78`	Return to the OR for related procedure during postoperative period	Use when a related unplanned return to the operating room occurs.
`80`	Assistant surgeon	Use when a surgical assistant performs a defined assisting role.
`81`	Minimum assistant surgeon	Use when minimal assistant involvement is documented.
`26`	Professional component	Use when only the physician component of a service is billed separate from technical component.
`TC`	Technical component	Use when only the technical component (facility or equipment) is billed.
`52`	Reduced services	Use when circumstances require that the full service not be rendered (listed for emphasis).

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.

CPT 45300: Diagnostic Proctosigmoidoscopy, Rigid

CPT-45303-PROCTOSIGMOIDOSCOPY-WITH-STRICTURE-DILATION

CPT 45303: Proctosigmoidoscopy with Stricture Dilation

CPT-45305-PROCTOSIGMOIDOSCOPY-WITH-BIOPSY

CPT 45305: Proctosigmoidoscopy with Biopsy

CPT-45307-PROCTOSIGMOIDOSCOPY-LOWER-GI-ENDOSCOPY

CPT 45307: Lower GI Proctosigmoidoscopy

CPT-45308-PROCTOSIGMOIDOSCOPIC-LESION-REMOVAL

CPT 45308: Proctosigmoidoscopic Removal of Single Lesion

CPT-45315-PROCTOSIGMOIDOSCOPIC-POLYPECTOMY-MULTIPLE-LESIONS

CPT 45315: Proctosigmoidoscopic Removal of Multiple Lesions

CPT-45317-PROCTOSIGMOIDOSCOPY-WITH-HEMOSTASIS

CPT 45317: Proctosigmoidoscopy with Hemostasis

CPT-45320-PROCTOSIGMOIDOSCOPIC-LESION-ABLATION

CPT 45320: Rigid Proctosigmoidoscopic Lesion Ablation

CPT-45321-PROCTOSIGMOIDOSCOPIC-DECOMPRESSION-SIGMOID-VOLVULUS

CPT 45321: Proctosigmoidoscopic Decompression of Sigmoid Volvulus

CPT-45327-PROCTOSIGMOIDOSCOPIC-STENT-PLACEMENT-FOR-RECTAL-SIGMOID-STRICTURE

CPT 45327: Proctosigmoidoscopic Placement of Colorectal Stent

Showing 1–10 of 39

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 45309: Proctosigmoidoscopy with Snare Excision of Lesion

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Billing Code Overview

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CPT 45309: Proctosigmoidoscopy with Snare Excision of Lesion

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

CPT 45309: Proctosigmoidoscopy with Snare Excision of Lesion

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Billing Code Overview

CPT 45309: Proctosigmoidoscopy with Snare Excision of Lesion

Sign up for cpt 45309 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What clinical service does CPT 45309 represent and where is it typically performed?

Which specialties commonly bill for CPT 45309?

Which billing modifiers are associated with CPT 45309 and when are they used?

What related CPT codes should I consider when coding cases involving CPT 45309?

Which diagnosis codes commonly support medical necessity for CPT 45309?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What clinical service does CPT 45309 represent and where is it typically performed?

Which specialties commonly bill for CPT 45309?

Which billing modifiers are associated with CPT 45309 and when are they used?

What related CPT codes should I consider when coding cases involving CPT 45309?

Which diagnosis codes commonly support medical necessity for CPT 45309?

References