CPT code 61797: Cranial radiosurgery, each additional simple lesion2026 Medicare rate & RVUs in Bartlett, Illinois
CPT 61797: $238.54–$262.48 facility across 2 localities in Bartlett, IL in 2026 Medicare. Compare each area.
CMS doesn’t publish an office rate for 61797 in Bartlett, Illinois.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 6 sections
Where 61797 pays more and less in Bartlett, Illinois
Bartlett, Illinois maps to 2 Medicare payment localities in our Census-to-CMS crosswalk. A city name alone doesn’t confirm an address’s payment area.
| Payment locality | Office | Facility |
|---|---|---|
| Chicago, IL | Unavailable | $262.48 |
| Suburban Chicago, IL | Unavailable | $238.54 |
How payment areas work in Bartlett
City limits and Medicare payment areas are different maps. These are the payment areas that cover the city’s counties; the service ZIP decides which one applies.
- Chicago · Cook County
- Suburban Chicago · DuPage County, Kane County
City boundaries: 2026 Census geography · Census source · CMS county-to-locality definitions
How the 61797 rate is calculated
Each of 61797’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.
How the rate is built · 61797
RVUs × geographic indexes × conversion factor
Work3.39
3.39 RVUs× 1.000 GPCI
Practice expense1.18
1.18 RVUs× 1.000 GPCI
Malpractice1.42
1.42 RVUs× 1.000 GPCI
Adjusted RVUs
5.9900
Conversion factor
$33.4009
Medicare rate
$200.07
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 61797
The CMS indicators that decide how 61797 is paid alongside other services.
CMS payment indicators · 61797
Cranial radiosurgery, each additional simple lesion
| Rule | CMS value | What it means |
|---|---|---|
| Global period | ZZZ | Add-on code: falls within the primary procedure’s global period. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 2 | Paid. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
What modifiers do to the payment
Modifier 80 · payment effect
With and without the modifier
61797 without 80 · national facility
$200.07
Cranial radiosurgery, each additional simple lesion
61797-80 · Assistant: 16%
$32.01
A physician assistant at surgery is paid 16% of the surgeon’s fee schedule amount.
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
Show the CMS file lines behind this rate
Fee sheets · Coming soon
Put 61797 and the rest of your codes on one sheet
Your codes at your locality, with payer contracts beside Medicare.
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