HCPCS code G0121: Screening colonoscopy, not high risk2026 Medicare rate & RVUs in Montana

In Montana, Medicare pays $378.40 for G0121 in the office and $164.97 when it’s performed in a hospital or facility.

Check a contract rate as a % of Medicare · G0121 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 G0121 covers

G0121 represents a colonoscopy performed for colorectal cancer screening when the patient is not classified as high risk. A gastroenterologist, surgeon, or other qualified practitioner advances a colonoscope through the large bowel to examine the colon for abnormalities. The service may be performed in a physician office or a facility, such as an ambulatory surgery center or hospital outpatient department.

Select G0121 based on the screening indication and the patient’s risk classification, not simply because a colonoscopy occurred. The record should support screening intent and include the procedure findings and extent of examination. CMS assigns a 0-day global period, so same-day preoperative and postoperative care is included. Modifier 53 has separate pricing treatment. When multiple procedures occur in one session, the highest-valued procedure is paid in full and others at 50%. Do not report modifier 50; assistant-at-surgery payment is restricted, and 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 G0121

Across 109 of 109 payment localities, the office rate for G0121 runs from $335.22 in Arkansas to $497.73 in San Benito County, CA. Montana pays $378.40. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

G0121 rates by state

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

See G0121 in every payment locality

How the G0121 rate is calculated

Each of G0121’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 G0121

The CMS indicators that decide how G0121 is paid alongside other services.

What modifiers do to the payment

When to use modifier 51

Codes related to G0121

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

How G0121 has changed in Montana

Price G0121 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