CPT code 77778: Interstitial brachytherapy, complex source application2026 Medicare rate & RVUs in Bartlett, Illinois
CPT 77778: $961.39–$965.79 office across 2 localities in Bartlett, IL in 2026 Medicare. Compare each area.
Medicare pays $961.39–$965.79 for 77778 in the office in Bartlett, Illinois, from Chicago, IL to Suburban Chicago, IL. Which amount applies depends on the service address.
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 77778 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 | $961.39 | Unavailable |
| Suburban Chicago, IL | $965.79 | Unavailable |
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 77778 rate is calculated
Each of 77778’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 · 77778
RVUs × geographic indexes × conversion factor
Work8.56
8.56 RVUs× 1.000 GPCI
Practice expense18.83
18.83 RVUs× 1.000 GPCI
Malpractice0.54
0.54 RVUs× 1.000 GPCI
Adjusted RVUs
27.9300
Conversion factor
$33.4009
Medicare rate
$932.89
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 77778
The CMS indicators that decide how 77778 is paid alongside other services.
CMS payment indicators · 77778
Interstitial brachytherapy, complex source application
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 000 | Same-day global: pre- and post-op care on the day of the procedure is included. |
| 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) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 1 | Diagnostic test with separate professional (26) and technical (TC) components. |
What modifiers do to the payment
Modifier 26 · payment effect
With and without the modifier
77778 without 26 · national office
$932.89
Interstitial brachytherapy, complex source application
77778-26 · Professional component
$459.93
Pays only the interpretation and report.
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 77778 and the rest of your codes on one sheet
Your codes at your locality, with payer contracts beside Medicare.
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