No office rate
Use 61605 for extradural resection in the middle cranial fossa; use 61606 when the lesion is treated intradurally in that fossa.
On this page
CMS RVU26D · Effective 2026-10-01
61605 Skull-base resection Medicare reimbursement rates in Idaho
Reports surgical removal of a lesion in the extradural space of the middle cranial fossa, with dural repair included when performed. Compare 61605 office and facility rates across CMS payment localities in Idaho.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 61605 in Idaho?
Idaho has 1 payment locality in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the payment area shown below, using the same CMS release.
Office / nonfacility
No supported rate
Facility setting
$1761.24
1 of 1 localities have a supported rate.
Payment area: Idaho
One mapped payment locality.
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Neurosurgery
About 61605: Middle cranial fossa extradural lesion resection
Reports surgical removal of a lesion in the extradural space of the middle cranial fossa, with dural repair included when performed.
This service covers surgical resection or excision of a neoplastic, vascular, or infectious lesion in the middle cranial fossa when the operative work is extradural. A neurosurgeon, often working with a skull-base team, performs the procedure in an operating room. The operative report should identify the lesion’s location and document that the work was extradural; the diagnosis alone does not establish the anatomic site or surgical plane. Dural repair, with or without a graft, is part of the service.
Select this code for the middle cranial fossa extradural location, rather than a different cranial fossa or an intradural procedure. Medicare assigns a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. If multiple procedures are performed in the same session, the highest-valued procedure is paid in full and the others are subject to the standard 50% multiple-procedure reduction. An assistant at surgery may be paid; co-surgeon payment requires supporting documentation, and team surgery is permitted.
CMS billing rules for 61605
- Global period
- Major surgery with a 90-day global period: the day-before preoperative visit and 90 days of related postoperative care are included.
- Multiple procedures
- Standard multiple procedure reduction: the highest-valued procedure is paid in full and others at 50% when performed in the same session.
- Bilateral procedures
- Bilateral adjustment does not apply; the descriptor or anatomy makes modifier 50 inappropriate.
- Assistant at surgery
- Assistant at surgery may be paid.
- Co-surgeons
- Co-surgeons paid only with supporting documentation.
- Team surgery
- Team surgery permitted.
Where the value comes from
- Work RVU31.76 · 55%
- Practice expense (office) RVU19.93 · 35%
- Malpractice RVU5.57 · 10%
485
Medicare services in 2024 · #3596 by national volume
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.
61605 compared with similar codes
Office rates for Idaho, from the same CMS release.
No office rate
This code is for the middle cranial fossa. Code 61600 is the corresponding extradural lesion-resection service for the anterior cranial fossa.
No office rate
Both describe extradural lesion resection, but 61607 is for the posterior cranial fossa rather than the middle cranial fossa.
Compare 61605 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
1 of 1 payment localities
Idaho →
Office / nonfacility
Unavailable
Facility
$1761.24
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How this local rate is calculated
Each RVU component is multiplied by its own geographic practice cost index (GPCI). The three adjusted components are added, then multiplied by the conversion factor. These are the inputs used for 61605 in Idaho.
PPRRVU2026_Oct_nonQPP.csv
6,837
- Code
- 61605
- Physician work
- 31.76
- Practice expense
- 19.93
- Malpractice
- 5.57
GPCI2026.csv
47
- Locality
- Idaho
- Physician work
- 1.000
- Practice expense
- 0.920
- Malpractice
- 0.473
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 31.76 | × 1.000 | 31.7600 |
| Practice expense | 19.93 | × 0.920 | 18.3356 |
| Malpractice | 5.57 | × 0.473 | 2.6346 |
| Total RVUs | 52.7302 | ||
| Conversion factor | × 33.4009 | ||
Facility rate, Idaho$1761.24
Explore RVUs, geographic factors and the full formula
Facility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 31.76 | 1 |
| Practice expense | 19.93 | 0.92 |
| Malpractice | 5.57 | 0.473 |
(31.76 × 1 + 19.93 × 0.92 + 5.57 × 0.473) × $33.4009 = $1761.24
The office and facility calculations use their respective practice-expense RVUs. The facility amount here is the physician fee, not a separate hospital or facility bill.
61605 billing questions
How does this differ from code 61606?
Both concern a middle cranial fossa lesion, but 61605 is for extradural operative work and 61606 is for intradural work. The operative report should support the compartment treated.
Is dural repair separately reported?
Dural repair, with or without a graft, is included in this lesion-resection service. The operative note should document the repair as part of the procedure.
What documentation supports this code?
Document the lesion’s middle cranial fossa location, its pathology when known, and the extradural surgical plane. Describe the resection and any dural repair performed.
How does the multiple-procedure reduction work?
For multiple procedures in the same session, Medicare pays the highest-valued procedure in full and applies the standard 50% reduction to the others.
Can an assistant or co-surgeon be reported?
An assistant at surgery may be paid. Co-surgeon payment requires supporting documentation; team surgery is permitted.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
6,83461598,,Transpetrosal approach/skull,A,,35.62,34.60,NA,34.60,,15.04,85.26,85.26,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
6,83561600,,Resect/excise cranial lesion,A,,29.26,21.58,NA,21.58,,6.49,57.33,57.33,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
6,83661601,,Resect/excise cranial lesion,A,,30.36,29.56,NA,29.56,,11.95,71.87,71.87,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
6,83761605,,Resect/excise cranial lesion,A,,31.76,19.93,NA,19.93,,5.57,57.26,57.26,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
6,83861606,,Resect/excise cranial lesion,A,,41.00,26.61,NA,26.61,,14.07,81.68,81.68,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
6,83961607,,Resect/excise cranial lesion,A,,39.91,23.47,NA,23.47,,11.26,74.64,74.64,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
6,84061608,,Resect/excise cranial lesion,A,,44.40,32.16,NA,32.16,,18.09,94.65,94.65,0,090,0.11,0.76,0.13,2,0,2,1,2,9,,33.4009,09,0,99,0.00,0.00,0.00
4410212,GA,01,ATLANTA,1.003,1.016,1.201
4510212,GA,99,REST OF GEORGIA,1.000,0.892,1.192
4601212,HI,01,"HAWAII, GUAM",1.000,1.137,0.579
4702202,ID,00,IDAHO,1.000,0.920,0.473
4806102,IL,16,CHICAGO,1.007,1.005,2.295
4906102,IL,12,EAST ST. LOUIS,1.000,0.920,2.014
5006102,IL,15,SUBURBAN CHICAGO,1.007,1.027,1.772