CPT 45340 Flexible Sigmoidoscopy Reimbursement | OpenPayer

Summary & Overview

CPT 45340: Flexible Sigmoidoscopy with Balloon Dilation of Colonic Stricture

CPT code 45340 represents a flexible sigmoidoscopy with balloon dilation of a colonic stricture — a combined diagnostic and therapeutic endoscopic procedure used to evaluate and mechanically widen abnormal narrowing in the distal colon. Nationally, this procedure is an important intervention for patients with symptomatic colorectal strictures from benign or malignant causes and is commonly performed in outpatient endoscopy settings and ambulatory surgery centers.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, typical sites of service, and common billing considerations tied to this procedure. The publication provides benchmarks and payment context where available, summarizes relevant coding relationships and modifiers, and highlights policy updates or coverage nuances that affect billing and prior authorization workflows.

This analysis is intended to help billing managers, coders, and policy analysts understand how CPT code 45340 fits into endoscopy service lines, what documentation and clinical context support use of the code, and where payers commonly apply coverage or payment edits. Data not available in the input will be identified explicitly in relevant sections.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare45340CPTflexible sigmoidoscopycolonic dilationendoscopygastroenterologyoutpatient surgeryprocedure coding

Billing Code Overview

CPT code 45340 describes a diagnostic and therapeutic flexible sigmoidoscopy in which the provider examines the anus, rectum, and sigmoid colon with a flexible sigmoidoscope. During the procedure, a channel in the scope is used to introduce a balloon catheter and the balloon is inflated to dilate a stricture (an abnormal narrowing) of the colon.

Service type: Endoscopic therapeutic procedure (sigmoidoscopic dilation of colonic stricture)
Typical site of service: Ambulatory surgery center or hospital outpatient department; may also be performed in endoscopy suites where flexible sigmoidoscopy and dilation are performed.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult with progressive lower abdominal cramping, altered bowel habits, or obstructive symptoms such as bloating and reduced stool caliber. The patient has prior imaging (CT abdomen/pelvis or contrast enema) or colonoscopy suggesting a short segment colonic stricture in the distal sigmoid or rectosigmoid. The gastroenterologist schedules an elective flexible sigmoidoscopy with through-the-scope balloon dilation under moderate sedation in an endoscopy suite or ambulatory surgery center. On the day of service, the patient undergoes pre-procedure assessment, informed consent, and moderate sedation monitoring. The provider introduces a flexible sigmoidoscope, visualizes the anus, rectum, and sigmoid colon, and passes a balloon catheter through the scope to the stricture. The balloon is inflated to dilate the narrowed segment under direct visualization and fluoroscopic guidance when needed. Post-dilation, the scope is reintroduced to inspect for mucosal trauma, bleeding, or perforation. The patient is observed until recovery from sedation and discharged with post-procedure instructions and follow-up arranged with the gastroenterology team.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal, uncomplicated service	Use when the procedure is the primary, expected service without complications or unusual circumstances.

CPT 45347: Sigmoidoscopy with Endoscopic Stent Placement

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

CPT 45330: Flexible Sigmoidoscopy, Diagnostic Evaluation

CPT-45305-PROCTOSIGMOIDOSCOPY-WITH-BIOPSY

CPT 45305: Proctosigmoidoscopy with Biopsy

45331-SIGMOIDOSCOPY-FLX-WBIOPSY

CPT 45331: Flexible Sigmoidoscopy with Biopsy

CPT-45382-COLONOSCOPY-ENDOSCOPIC-CONTROL-OF-COLONIC-BLEEDING

CPT 45382: Colonoscopy with Endoscopic Control of Colonic Bleeding

CPT-45392-COLONOSCOPE-EUS-GUIDED-FNA-BIOPSY

CPT 45392: Colonoscopic Endoscopic Ultrasound-Guided Fine Needle Biopsy

CPT-45379-COLONOSCOPIC-FOREIGN-BODY-REMOVAL

CPT 45379: Colonoscopic Removal of Foreign Body

CPT-45349-FLEXIBLE-SIGMOIDOSCOPIC-MUCOSAL-RESECTION

CPT 45349: Flexible Sigmoidoscopic Mucosal Resection

CPT-45317-PROCTOSIGMOIDOSCOPY-WITH-HEMOSTASIS

CPT 45317: Proctosigmoidoscopy with Hemostasis

CPT-45307-PROCTOSIGMOIDOSCOPY-LOWER-GI-ENDOSCOPY

CPT 45307: Lower GI Proctosigmoidoscopy

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Taxonomy Code	Specialty	Notes
207RC0000X	Gastroenterology	Primary specialty performing sigmoidoscopy with balloon dilation.
2080P0001X	Colon and Rectal Surgery	Colorectal surgeons perform dilation for strictures not amenable to endoscopic-only techniques or when surgical expertise is needed.
2085R0200X	General Surgery	General surgeons with endoscopy privileges may perform therapeutic sigmoidoscopy in operative or endoscopy settings.
363L00000X	Anesthesiology	Provides monitored anesthesia care or general anesthesia when required for the procedure.
261QP2300X	Nurse Practitioner (Gastroenterology)	May perform or assist with pre- and post-procedure care and, where credentialed, perform endoscopic procedures under supervision.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K50.90`	Crohn's disease, unspecified, without complications	Crohn disease can cause inflammatory strictures in the sigmoid requiring endoscopic balloon dilation.
`K51.90`	Ulcerative colitis, unspecified, without complications	Chronic colitis may lead to segmental stricturing amenable to dilation after excluding active severe inflammation.
`K57.30`	Diverticulosis of large intestine without perforation or abscess	Diverticular disease can be associated with strictures from chronic inflammation or scarring in the sigmoid.
`K62.5`	Hemorrhage of anus and rectum	Bleeding may be encountered during dilation or as an indication for endoscopic evaluation of a symptomatic patient.
`K63.5`	Polyp of colon	Polyp-related scarring or prior polypectomy sites can produce localized narrowing treated with dilation.
`K63.8`	Other specified diseases of intestine	Includes benign strictures or postsurgical changes leading to symptomatic narrowing of the sigmoid.
`C18.7`	Malignant neoplasm of sigmoid colon	Malignancy can present with a malignant stricture; endoscopic dilation may be performed for palliation or to facilitate decompression, with careful documentation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`45330`	Sigmoidoscopy, flexible; diagnostic, with or without collection of specimen(s) by brushing or washing	Often performed before therapeutic dilation to visualize the stricture and evaluate mucosa; may be the diagnostic component of the encounter.
`45331`	Sigmoidoscopy, flexible; with biopsy, single or multiple	Performed when tissue sampling of the stricture or adjacent mucosa is needed to rule out malignancy or inflammation prior to or during dilation.
`45338`	Sigmoidoscopy, flexible; with directed submucosal injection(s), any substance	May be used when adjunctive injection is required (e.g., for hemostasis of bleeding after dilation).
`45380`	Colonoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed	Performed when a more proximal evaluation of the colon is clinically indicated either before or after a sigmoid dilation.
`45385`	Colonoscopy, flexible; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique	Performed if polyps or lesions are encountered during the same session and require removal; may change coding/bundling considerations.
`43239`	Endoscopy, dilatation of esophagus, by balloon (included as analogous therapeutic dilation CPT)	Listed for procedural similarity; illustrates coding of balloon dilation techniques in endoscopy workflows though anatomically distinct.

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