CPT code 45391: Colonoscopy EUS, ultrasound examination only2026 Medicare rate & RVUs in Montana

In Montana, Medicare pays $226.09 for 45391 in a facility. There’s no office rate.

Check a contract rate as a % of Medicare · 45391 nationwide

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 45391 covers

A gastroenterologist or other qualified endoscopist advances a colonoscope to examine the colon and uses an ultrasound transducer during the procedure to assess bowel-wall layers and adjacent anatomy. Common reasons include evaluating a subepithelial lesion, characterizing a rectal mass, or assessing local rectal cancer extent. The procedure is typically performed in a hospital endoscopy unit or ambulatory endoscopy center.

Select this code when the colonoscopy includes endoscopic ultrasound examination without ultrasound-guided needle sampling; when EUS guides fine-needle aspiration or biopsy, compare 45392. The report should identify the findings and document the ultrasound examination. CMS assigns a 0-day global period, so same-day preoperative and postoperative care is included. When related endoscopies are performed together, endoscopy family pricing applies. Modifier 50 is inappropriate. Medicare does not pay an assistant at surgery for this service; co-surgeons and team surgery are not permitted.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

How Montana compares for 45391

Across 109 of 109 payment localities, the facility rate for 45391 runs from $209.90 in Arkansas to $298.08 in Alaska. Montana pays $226.09. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

45391 rates by state

Office rate range in each state. Select a state to see its payment localities.

See 45391 in every payment locality

How the 45391 rate is calculated

Each of 45391’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 45391

The CMS indicators that decide how 45391 is paid alongside other services.

What modifiers do to the payment

When to use modifier 51

Codes related to 45391

Related codes aren’t interchangeable: bill the code that matches the service performed.

How 45391 has changed in Montana

Price 45391 for an earlier date of service

Where the Montana rate applies

Montana is a Medicare payment area, not a city. Our Census mapping connects it to 497 cities and communities in Montana. Some span more than one payment area; confirm with the service ZIP.

• Absarokee
• Acton
• Alberton
• Alder
• Alzada
• Amsterdam
• Anaconda-Deer Lodge County
• Antelope

Browse all communities in Montana

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates