CPT 45391 Colon EUS Reimbursement & Benchmarks | OpenPayer

Summary & Overview

CPT 45391: Colon Endoscopic Ultrasound (EUS)

CPT code 45391 represents an endoscopic ultrasound (EUS) of the colon, a diagnostic procedure that combines colonoscopy with intraluminal ultrasound to evaluate lesions and stage colorectal malignancies. Nationally, this procedure matters because it informs cancer staging and therapeutic planning, can alter management pathways, and has implications for imaging resource use and specialist procedural capacity.

Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The report summarizes payer coverage patterns, typical reimbursement structures, and common clinical contexts in which CPT code 45391 is used.

Readers will learn the clinical purpose and typical site of service for the procedure, common billing considerations, and how this code fits into colorectal cancer diagnostic workflows. The publication outlines benchmarks and policy-relevant issues that affect access to endoscopic ultrasound for colorectal evaluation, including payer coverage nuances and Medicare's role in defining national standards. Data not available in the input is noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare45391CPTendoscopic ultrasoundcolonoscopygastroenterologycolorectal cancerdiagnostic imagingambulatory surgery

Billing Code Overview

CPT code 45391 describes an endoscopic ultrasound (EUS) of the colon performed with a colonoscope. The provider examines the rectum, sigmoid, descending, transverse, or ascending colon and cecum using a long, flexible colonoscope equipped with a light and camera, introduces an ultrasound probe through the instrument channel, and performs an ultrasound evaluation of the colon.

Service type: Endoscopic ultrasound of the colon

Typical site of service: Endoscopy suite or ambulatory surgical center

Clinical & Coding Specifications

Clinical Context

A 62-year-old male with a recent positive fecal immunochemical test (FIT) and iron-deficiency anemia is referred to gastroenterology for diagnostic evaluation. The gastroenterologist schedules an endoscopic ultrasound (EUS) performed during colonoscopy using a colonoscope with an ultrasound probe inserted through the instrument channel to evaluate a suspicious colonic mass identified on prior imaging. The procedure is performed in an ambulatory endoscopy suite with moderate sedation, monitoring by nursing staff, and availability of anesthesia support if needed. The clinical workflow includes pre-procedure history and consent, bowel preparation assessment, intraprocedural real-time ultrasound assessment of lesion size, depth of invasion, and regional lymph nodes, targeted biopsy or fine-needle aspiration if indicated, post-procedure recovery with discharge instructions, and pathology correlation for staging and treatment planning. Typical payors for scheduling and billing include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician’s interpretation of the ultrasound portion separated from technical services.
`TC`

CPT 45392: Colonoscopic Endoscopic Ultrasound-Guided Fine Needle Biopsy

45331-SIGMOIDOSCOPY-FLX-WBIOPSY

CPT 45331: Flexible Sigmoidoscopy with Biopsy

CPT-45393-COLONOSCOPY-DECOMPRESSION-DILATED-COLON

CPT 45393: Flexible Colonoscopy with Colonic Decompression

CPT-45307-PROCTOSIGMOIDOSCOPY-LOWER-GI-ENDOSCOPY

CPT 45307: Lower GI Proctosigmoidoscopy

CPT-45308-PROCTOSIGMOIDOSCOPIC-LESION-REMOVAL

CPT 45308: Proctosigmoidoscopic Removal of Single Lesion

CPT-45335-FLEXIBLE-ENDOSCOPE-SUBMUCOSAL-INJECTION-SIGMOID-RECTUM

CPT 45335: Flexible Endoscope with Submucosal Injection, Rectum/Sigmoid

CPT-45390-FLEXIBLE-COLONOSCOPY-MUCOSAL-EXCISION

CPT 45390: Flexible Colonoscopy with Mucosal Excision

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

CPT 45382: Colonoscopy with Endoscopic Control of Colonic Bleeding

45385-COLONOSCOPY-FLEXIBLE-PROXIMAL-TO-SPLENIC-FLEXURE-WITH

CPT 45385: Colonoscopy with Snare Removal of Tumor, Polyp, or Lesion

45380-COLONOSCOPY-FLEXIBLE-PROXIMAL-TO-SPLENIC-FLEXURE-WITH

CPT 45380: Flexible Colonoscopy with Biopsy

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Taxonomy Code	Specialty	Notes
207LR0400X	Colon & Rectal Surgery	Surgeons performing diagnostic and staging endoscopic procedures of the colon.
207RG0100X	Gastroenterology	Primary specialty performing colonoscopic EUS for diagnosis and staging.
2080P0002X	General Surgery	General surgeons who may perform EUS in complex cases or intraoperative settings.
207RH0002X	Surgical Oncology	Surgical oncologists involved in staging colorectal malignancies.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C18.9`	Malignant neoplasm of colon, unspecified	Primary diagnosis when a colon mass is suspected and EUS is used for local staging.
`C19`	Malignant neoplasm of rectosigmoid junction	EUS assists in staging lesions at the rectosigmoid junction for treatment planning.
`D50.9`	Iron deficiency anemia, unspecified	Common presenting problem prompting evaluation that may lead to colonoscopy with EUS when mass suspected.
`K57.30`	Diverticulosis of large intestine without perforation or abscess without bleeding	Differential diagnosis for colonic symptoms; EUS may help characterize wall abnormalities when needed.
`K52.9`	Noninfective gastroenteritis and colitis, unspecified	Symptom-driven evaluation sometimes includes colonoscopic assessment; EUS used when focal lesion requires further local staging.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`45378`	Colonoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)	Common diagnostic colonoscopy performed when EUS is not required or prior to staging; may be performed in same session depending on findings.
`45380`	Colonoscopy with biopsy, single or multiple	Often performed with EUS when targeted mucosal biopsies are obtained in addition to ultrasound staging.
`43242`	Esophagogastroduodenoscopy, flexible, transoral; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)	May be performed in the same endoscopy suite for upper GI symptoms or synchronous evaluation when clinically indicated.
`76937`	Ultrasound guidance for biopsy, needle placement, or for aspiration, radiological supervision and interpretation	Used if ultrasound guidance is billed separately for fine-needle aspiration or biopsy of a lesion visualized during EUS.
`44203`	Laparoscopy, surgical; colectomy, partial, with anastomosis	Surgical resection code that may follow staging EUS if malignancy is confirmed and resection is planned.

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