CPT code 77770: HDR brachytherapy, single channel, per fraction2026 Medicare rate & RVUs in Montana
Reports one fraction of remote afterloading high-dose-rate brachytherapy for interstitial or intracavitary treatment using a single channel.
In Montana, Medicare pays $349.36 for 77770 in the office.
Check a contract rate as a % of Medicare · 77770 nationwide
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 11 sections
What 77770 covers
A radiation oncologist uses a remote afterloader to send a radioactive source through an applicator or catheter into an interstitial or intracavitary treatment site. This code represents the single-channel service for one fraction; examples of treatment sites include gynecologic cavities and implanted interstitial catheters. The provider manages delivery of the planned HDR treatment fraction. Services are commonly furnished in a hospital radiation oncology department or an outpatient radiation treatment center.
Select this code when the fraction uses one channel, rather than the channel counts represented by 77771 or 77772. The record should support the treatment site, fraction delivered, remote afterloading method, and number of channels used. Report the global service without a component modifier, or report modifier 26 for the professional component and TC for the technical component when billing them separately. CMS lists both components as separately priced.
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 77770
Across 109 of 109 payment localities, the office rate for 77770 runs from $307.57 in Arkansas to $478.79 in San Benito County, CA. Montana pays $349.36. The RVUs are the same everywhere; the geographic indexes change the dollars.
- Montana · this page$349.36
- Los Angeles, CA · California$402.04+$52.68
- Washington, DC area · District of Columbia$403.41+$54.05
- Miami, FL · Florida$367.56+$18.20
- Chicago, IL · Illinois$356.85+$7.49
- Manhattan, NY · New York$401.59+$52.23
- Alaska · Alaska$397.46+$48.10
Other areas in Montana first, then benchmark localities. Bars start at $0.
Every other payment area
| Payment locality | Office | Facility |
|---|---|---|
| AlabamaAlabama | $312.29 | — |
| ArkansasArkansas | $307.57 | — |
| ArizonaArizona | $340.02 | — |
| Bakersfield, CACalifornia | $375.91 | — |
| Chico, CACalifornia | $375.47 | — |
| El Centro, CACalifornia | $375.49 | — |
| Fresno, CACalifornia | $375.47 | — |
| Hanford, CACalifornia | $375.47 | — |
| Madera, CACalifornia | $375.47 | — |
| Merced, CACalifornia | $375.47 | — |
| Modesto, CACalifornia | $375.47 | — |
| Napa, CACalifornia | $440.77 | — |
| Oxnard, CACalifornia | $400.76 | — |
| Redding, CACalifornia | $375.47 | — |
| Rest of CaliforniaCalifornia | $375.47 | — |
| Riverside, CACalifornia | $376.91 | — |
| Sacramento, CACalifornia | $395.54 | — |
| Salinas, CACalifornia | $394.10 | — |
| San Diego, CACalifornia | $404.48 | — |
| Marin County, CACalifornia | $468.50 | — |
| San Francisco, CACalifornia | $468.35 | — |
| San Benito County, CACalifornia | $478.79 | — |
| Santa Clara County, CACalifornia | $478.19 | — |
| San Luis Obispo, CACalifornia | $387.58 | — |
| Santa Cruz, CACalifornia | $409.23 | — |
| Santa Maria, CACalifornia | $395.88 | — |
| Santa Rosa, CACalifornia | $413.46 | — |
| Stockton, CACalifornia | $375.47 | — |
| Vallejo, CACalifornia | $440.56 | — |
| Visalia, CACalifornia | $375.47 | — |
| Yuba City, CACalifornia | $375.47 | — |
| ColoradoColorado | $367.20 | — |
| ConnecticutConnecticut | $373.24 | — |
| DelawareDelaware | $345.87 | — |
| Fort Lauderdale, FLFlorida | $356.54 | — |
| Rest of FloridaFlorida | $339.17 | — |
| Atlanta, GAGeorgia | $354.94 | — |
| Rest of GeorgiaGeorgia | $319.80 | — |
| Hawaii, Guam, HIHawaii | $386.12 | — |
| IowaIowa | $322.82 | — |
| IdahoIdaho | $324.56 | — |
| East St. Louis, ILIllinois | $331.25 | — |
| Rest of IllinoisIllinois | $327.32 | — |
| Suburban Chicago, ILIllinois | $360.77 | — |
| IndianaIndiana | $326.59 | — |
| KansasKansas | $320.19 | — |
| KentuckyKentucky | $317.75 | — |
| New Orleans, LALouisiana | $333.35 | — |
| Rest of LouisianaLouisiana | $316.81 | — |
| Metropolitan Boston, MAMassachusetts | $406.12 | — |
| Rest of MassachusettsMassachusetts | $364.43 | — |
| Baltimore area, MDMaryland | $371.97 | — |
| Rest of MarylandMaryland | $353.03 | — |
| Rest of MaineMaine | $325.21 | — |
| Southern Maine, MEMaine | $345.24 | — |
| Detroit, MIMichigan | $342.50 | — |
| Rest of MichiganMichigan | $325.44 | — |
| MinnesotaMinnesota | $354.48 | — |
| Metropolitan Kansas City, MOMissouri | $332.10 | — |
| Metropolitan St. Louis, MOMissouri | $335.87 | — |
| Rest of MissouriMissouri | $310.40 | — |
| MississippiMississippi | $309.10 | — |
| North CarolinaNorth Carolina | $328.94 | — |
| North DakotaNorth Dakota | $346.79 | — |
| NebraskaNebraska | $324.99 | — |
| New HampshireNew Hampshire | $360.38 | — |
| Northern New JerseyNew Jersey | $398.72 | — |
| Rest of New JerseyNew Jersey | $378.24 | — |
| New MexicoNew Mexico | $326.88 | — |
| NevadaNevada | $348.93 | — |
| NYC suburbs and Long Island, NYNew York | $410.37 | — |
| Poughkeepsie and northern NYC suburbs, NYNew York | $379.89 | — |
| Queens, NYNew York | $406.60 | — |
| Rest of New YorkNew York | $334.01 | — |
| OhioOhio | $324.91 | — |
| OklahomaOklahoma | $318.28 | — |
| Portland, OROregon | $380.53 | — |
| Rest of OregonOregon | $346.96 | — |
| Metropolitan Philadelphia, PAPennsylvania | $362.90 | — |
| Rest of PennsylvaniaPennsylvania | $326.05 | — |
| Puerto RicoPuerto Rico | $352.41 | — |
| Rhode IslandRhode Island | $359.40 | — |
| South CarolinaSouth Carolina | $327.32 | — |
| South DakotaSouth Dakota | $346.49 | — |
| TennesseeTennessee | $321.74 | — |
| Austin, TXTexas | $365.34 | — |
| Beaumont, TXTexas | $323.72 | — |
| Brazoria, TXTexas | $346.39 | — |
| Dallas, TXTexas | $348.20 | — |
| Fort Worth, TXTexas | $345.44 | — |
| Galveston, TXTexas | $347.16 | — |
| Houston, TXTexas | $349.54 | — |
| Rest of TexasTexas | $334.59 | — |
| UtahUtah | $332.04 | — |
| VirginiaVirginia | $343.31 | — |
| Virgin Islands, VIUnited States Virgin Islands | $352.41 | — |
| VermontVermont | $344.41 | — |
| Rest of WashingtonWashington | $364.08 | — |
| King County, WAWashington | $415.67 | — |
| WisconsinWisconsin | $334.54 | — |
| West VirginiaWest Virginia | $314.36 | — |
| WyomingWyoming | $348.24 | — |
77770 rates by state
Office rate range in each state. Select a state to see its payment localities.
Explore a state
Local rates. Clear comparisons.
Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.
$307.57
$427.13
Color shows the midpoint of each state’s locality range.
View every state and territory as a table
| State / territory | Office rate range | Localities |
|---|---|---|
| AK | $397.46 | 1 |
| AL | $312.29 | 1 |
| AR | $307.57 | 1 |
| AZ | $340.02 | 1 |
| CA | $375.47–$478.79 | 29 |
| CO | $367.20 | 1 |
| CT | $373.24 | 1 |
| DC | $403.41 | 1 |
| DE | $345.87 | 1 |
| FL | $339.17–$367.56 | 3 |
| GA | $319.80–$354.94 | 2 |
| GU | $386.12 | 1 |
| HI | $386.12 | 1 |
| IA | $322.82 | 1 |
| ID | $324.56 | 1 |
| IL | $327.32–$360.77 | 4 |
| IN | $326.59 | 1 |
| KS | $320.19 | 1 |
| KY | $317.75 | 1 |
| LA | $316.81–$333.35 | 2 |
| MA | $364.43–$406.12 | 2 |
| MD | $353.03–$403.41 | 3 |
| ME | $325.21–$345.24 | 2 |
| MI | $325.44–$342.50 | 2 |
| MN | $354.48 | 1 |
| MO | $310.40–$335.87 | 3 |
| MS | $309.10 | 1 |
| MT | $349.36 | 1 |
| NC | $328.94 | 1 |
| ND | $346.79 | 1 |
| NE | $324.99 | 1 |
| NH | $360.38 | 1 |
| NJ | $378.24–$398.72 | 2 |
| NM | $326.88 | 1 |
| NV | $348.93 | 1 |
| NY | $334.01–$410.37 | 5 |
| OH | $324.91 | 1 |
| OK | $318.28 | 1 |
| OR | $346.96–$380.53 | 2 |
| PA | $326.05–$362.90 | 2 |
| PR | $352.41 | 1 |
| RI | $359.40 | 1 |
| SC | $327.32 | 1 |
| SD | $346.49 | 1 |
| TN | $321.74 | 1 |
| TX | $323.72–$365.34 | 8 |
| UT | $332.04 | 1 |
| VA | $343.31–$403.41 | 2 |
| VI | $352.41 | 1 |
| VT | $344.41 | 1 |
| WA | $364.08–$415.67 | 2 |
| WI | $334.54 | 1 |
| WV | $314.36 | 1 |
| WY | $348.24 | 1 |
How the 77770 rate is calculated
Each of 77770’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 · 77770
RVUs × geographic indexes × conversion factor
Work1.90
1.90 RVUs× 1.000 GPCI
Practice expense8.43
8.43 RVUs× 1.000 GPCI
Malpractice0.13
0.13 RVUs× 1.000 GPCI
Adjusted RVUs
10.4600
Conversion factor
$33.4009
Medicare rate
$349.37
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
The exact Montana inputs and CMS source lines
PPRRVU2026_Oct_nonQPP.csv
9,160
- Code
- 77770
- Physician work
- 1.90
- Practice expense
- 8.43
- Malpractice
- 0.13
GPCI2026.csv
71
- Locality
- Montana
- Physician work
- 1.000
- Practice expense
- 1.000
- Malpractice
- 0.998
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 1.90 | × 1.000 | 1.9000 |
| Practice expense | 8.43 | × 1.000 | 8.4300 |
| Malpractice | 0.13 | × 0.998 | 0.1297 |
| Total RVUs | 10.4597 | ||
| Conversion factor | × 33.4009 | ||
Office rate, Montana$349.36
Office: (1.9 × 1 + 8.43 × 1 + 0.13 × 0.998) × $33.4009 = $349.36
Payment rules and modifiers for 77770
The CMS indicators that decide how 77770 is paid alongside other services.
CMS payment indicators · 77770
HDR brachytherapy, single channel, per fraction
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| 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
77770 without 26 · national office
$349.37
HDR brachytherapy, single channel, per fraction
77770-26 · Professional component
$101.87
Pays only the interpretation and report.
How 77770 has changed in Montana
77770 · Office / nonfacility
$349.36
Effective 2026-10-01
The base rate is $10.13 higher than on 2025-10-01, moving from $339.23 to $349.36 (3.0%).
It is unchanged from the immediately preceding available release, effective 2026-07-01.
One bar per available release, ordered by effective date. Missing rates remain gaps. These comparisons hold the code, setting and locality identifiers constant; they do not isolate which policy or input caused a change.
What changed, release by release
January 1, 2026
RVU26A
$339.23changed to$349.36
- Conversion factor 32.3465 changed to 33.4009
- Work RVU 1.95 changed to 1.90
- Practice expense RVU 8.42 changed to 8.43
- Malpractice RVU 0.12 changed to 0.13
- Malpractice GPCI 0.978 changed to 0.998
Held through RVU26B, RVU26C, RVU26D.
January 1, 2025
RVU25A
$347.75changed to$339.23
- Conversion factor 33.2875 changed to 32.3465
- Practice expense RVU 8.36 changed to 8.42
- Malpractice RVU 0.14 changed to 0.12
Held through RVU25B, RVU25C, RVU25D.
March 9, 2024
RVU24AR
$342.08changed to$347.75
- Conversion factor 32.7442 changed to 33.2875
Held through RVU24B, RVU24C, RVU24D.
January 1, 2024
RVU24A
$350.30changed to$342.08
- Conversion factor 33.8872 changed to 32.7442
- Practice expense RVU 8.27 changed to 8.36
- Malpractice RVU 0.12 changed to 0.14
January 1, 2023
RVU23A
$351.84changed to$350.30
- Conversion factor 34.6062 changed to 33.8872
- Practice expense RVU 8.09 changed to 8.27
- Malpractice RVU 0.13 changed to 0.12
- Malpractice GPCI 0.977 changed to 0.978
Held through RVU23B, RVU23C, RVU23D.
January 1, 2022
RVU22A
$353.38changed to$351.84
- Conversion factor 34.8931 changed to 34.6062
- Practice expense RVU 8.07 changed to 8.09
- Malpractice RVU 0.11 changed to 0.13
Held through RVU22B, RVU22C, RVU22D.
January 1, 2021
RVU21A
$344.64changed to$353.38
- Conversion factor 36.0896 changed to 34.8931
- Practice expense RVU 7.43 changed to 8.07
- Malpractice RVU 0.13 changed to 0.11
- Malpractice GPCI 1.304 changed to 0.977
Held through RVU21B, RVU21C, RVU21D.
January 1, 2020
RVU20A
$340.05changed to$344.64
- Conversion factor 36.0391 changed to 36.0896
- Practice expense RVU 7.29 changed to 7.43
- Malpractice RVU 0.12 changed to 0.13
- Malpractice GPCI 1.631 changed to 1.304
Held through RVU20B, RVU20C, RVU20D.
January 1, 2019
RVU19A
$337.16changed to$340.05
- Conversion factor 35.9996 changed to 36.0391
- Practice expense RVU 7.22 changed to 7.29
Held through RVU19B, RVU19C, RVU19D.
January 1, 2018
RVU18AR1
$328.43changed to$337.16
- Conversion factor 35.8887 changed to 35.9996
- Practice expense RVU 7.03 changed to 7.22
- Malpractice GPCI 1.429 changed to 1.631
Held through RVU18B, RVU18C, RVU18D.
January 1, 2017
RVU17A
$325.36changed to$328.43
- Conversion factor 35.8043 changed to 35.8887
- Practice expense RVU 6.99 changed to 7.03
- Malpractice GPCI 1.226 changed to 1.429
Held through RVU17B, RVU17C, RVU17D.
January 1, 2016
RVU16A
No ratechanged to$325.36
Held through RVU16B, RVU16C, RVU16D.
January 1, 2013
RVU13AR
Earliest loaded release: No rate
Held through RVU13B, RVU13C, RVU13D, RVU14A, RVU14B, RVU14C, RVU14D, RVU15A, RVU15B, RVU15C, RVU15D.
| Effective from | Office | Facility | CMS release |
|---|---|---|---|
| 2026-10-01 | $349.36 | Not available in this setting | RVU26D |
| 2026-07-01 | $349.36 | Not available in this setting | RVU26C |
| 2026-04-01 | $349.36 | Not available in this setting | RVU26B |
| 2026-01-01 | $349.36 | Not available in this setting | RVU26A |
| 2025-10-01 | $339.23 | Not available in this setting | RVU25D |
| 2025-07-01 | $339.23 | Not available in this setting | RVU25C |
| 2025-04-01 | $339.23 | Not available in this setting | RVU25B |
| 2025-01-01 | $339.23 | Not available in this setting | RVU25A |
| 2024-10-01 | $347.75 | Not available in this setting | RVU24D |
| 2024-07-01 | $347.75 | Not available in this setting | RVU24C |
| 2024-04-01 | $347.75 | Not available in this setting | RVU24B |
| 2024-03-09 | $347.75 | Not available in this setting | RVU24AR |
| 2024-01-01 | $342.08 | Not available in this setting | RVU24A |
| 2023-10-01 | $350.30 | Not available in this setting | RVU23D |
| 2023-07-01 | $350.30 | Not available in this setting | RVU23C |
| 2023-04-01 | $350.30 | Not available in this setting | RVU23B |
| 2023-01-01 | $350.30 | Not available in this setting | RVU23A |
| 2022-10-01 | $351.84 | Not available in this setting | RVU22D |
| 2022-07-01 | $351.84 | Not available in this setting | RVU22C |
| 2022-04-01 | $351.84 | Not available in this setting | RVU22B |
| 2022-01-01 | $351.84 | Not available in this setting | RVU22A |
| 2021-10-01 | $353.38 | Not available in this setting | RVU21D |
| 2021-07-01 | $353.38 | Not available in this setting | RVU21C |
| 2021-04-01 | $353.38 | Not available in this setting | RVU21B |
| 2021-01-01 | $353.38 | Not available in this setting | RVU21A |
| 2020-10-01 | $344.64 | Not available in this setting | RVU20D |
| 2020-07-01 | $344.64 | Not available in this setting | RVU20C |
| 2020-04-01 | $344.64 | Not available in this setting | RVU20B |
| 2020-01-01 | $344.64 | Not available in this setting | RVU20A |
| 2019-10-01 | $340.05 | Not available in this setting | RVU19D |
| 2019-07-01 | $340.05 | Not available in this setting | RVU19C |
| 2019-04-01 | $340.05 | Not available in this setting | RVU19B |
| 2019-01-01 | $340.05 | Not available in this setting | RVU19A |
| 2018-10-01 | $337.16 | Not available in this setting | RVU18D |
| 2018-07-01 | $337.16 | Not available in this setting | RVU18C |
| 2018-04-01 | $337.16 | Not available in this setting | RVU18B |
| 2018-01-01 | $337.16 | Not available in this setting | RVU18AR1 |
| 2017-10-01 | $328.43 | Not available in this setting | RVU17D |
| 2017-07-01 | $328.43 | Not available in this setting | RVU17C |
| 2017-04-01 | $328.43 | Not available in this setting | RVU17B |
| 2017-01-01 | $328.43 | Not available in this setting | RVU17A |
| 2016-10-01 | $325.36 | Not available in this setting | RVU16D |
| 2016-07-01 | $325.36 | Not available in this setting | RVU16C |
| 2016-04-01 | $325.36 | Not available in this setting | RVU16B |
| 2016-01-01 | $325.36 | Not available in this setting | RVU16A |
| 2015-10-01 | Not in this release | Not in this release | RVU15D |
| 2015-07-01 | Not in this release | Not in this release | RVU15C |
| 2015-04-01 | Not in this release | Not in this release | RVU15B |
| 2015-01-01 | Not in this release | Not in this release | RVU15A |
| 2014-10-01 | Not in this release | Not in this release | RVU14D |
| 2014-07-01 | Not in this release | Not in this release | RVU14C |
| 2014-04-01 | Not in this release | Not in this release | RVU14B |
| 2014-01-01 | Not in this release | Not in this release | RVU14A |
| 2013-10-01 | Not in this release | Not in this release | RVU13D |
| 2013-07-01 | Not in this release | Not in this release | RVU13C |
| 2013-04-01 | Not in this release | Not in this release | RVU13B |
| 2013-01-01 | Not in this release | Not in this release | RVU13AR |
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
77770 billing questions
How does 77770 differ from 77771 and 77772?
77770 represents a single channel per fraction. The sibling codes represent higher channel-count levels: 77771 for 2–12 channels and 77772 for more than 12.
Is 77770 reported per treatment course or per fraction?
It is reported for each qualifying treatment fraction, not once for the entire course. Documentation should identify the fraction delivered and channel count.
Which modifiers identify the professional and technical components?
Modifier 26 identifies the professional component, and modifier TC identifies the technical component. Without either modifier, the claim represents the global service.
What documentation supports choosing the single-channel level?
The treatment record should show remote afterloading HDR delivery and that one channel was used for the fraction. The treatment site and fraction should also be identifiable.
Is 77770 the code for surface HDR brachytherapy?
No. 77770 is for interstitial or intracavitary HDR treatment. Codes 77767 and 77768 describe HDR treatment of a skin surface.
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
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