CPT code 61108: Subdural drainage, twist-drill approach2026 Medicare rate & RVUs in Montana

In Montana, Medicare pays $928.57 for 61108 in a facility. There’s no office rate.

Check a contract rate as a % of Medicare · 61108 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 61108 covers

A neurosurgeon uses a twist drill to create a small opening in the skull and evacuates or drains a subdural hematoma. The service is commonly performed in a hospital operating room or other hospital setting for a patient whose subdural collection requires procedural treatment. The operative report should identify the hematoma and document the twist-drill approach and evacuation or drainage performed.

Choose this code for subdural hematoma treatment using twist-drill access, rather than a burr-hole approach or a procedure whose defining purpose is puncture or catheter placement. This major surgery has a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. When multiple procedures occur in the same session, the highest-valued procedure is paid in full and others are subject to the standard 50% reduction. 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 61108

Across 109 of 109 payment localities, the facility rate for 61108 runs from $798.74 in Arkansas to $1,179.05 in Miami, FL. Montana pays $928.57. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

61108 rates by state

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

See 61108 in every payment locality

How the 61108 rate is calculated

Each of 61108’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 61108

61108 has a 90-day global period: related visits in that window are included in the surgery payment.

What modifiers do to the payment

When to use modifier 51

Codes related to 61108

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

How 61108 has changed in Montana

Price 61108 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