CPT code 77771: HDR brachytherapy, interstitial or intracavitary, intermediate2026 Medicare rate & RVUs in Kentucky
Reports intermediate-complexity high-dose-rate brachytherapy delivery through interstitial catheters or an intracavitary applicator for a treatment session.
In Kentucky, Medicare pays $557.08 for 77771 in the office.
Check a contract rate as a % of Medicare · 77771 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 77771 covers
A radiation oncologist uses a remote afterloader to send a temporary high-dose-rate radioactive source through interstitial catheters or an intracavitary applicator. The source delivers radiation at planned positions and is withdrawn after treatment. Common clinical settings include gynecologic brachytherapy using an intracavitary applicator and interstitial treatment using implanted catheters. This code identifies the intermediate-complexity level of HDR delivery, rather than superficial skin treatment or permanent source implantation.
Select the intermediate level using the documented complexity of the delivery and the applicable CPT criteria; do not assign it solely from the treatment site or fraction count. The record should support the applicator or catheter arrangement, treatment delivery, and level selected. The service covers management of the HDR source as part of delivery. CMS lists separately priced professional and technical components: modifier 26 identifies the professional interpretation, modifier TC identifies equipment and staff, and billing without either modifier represents the global service.
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 Kentucky compares for 77771
Across 109 of 109 payment localities, the office rate for 77771 runs from $539.14 in Arkansas to $831.61 in San Benito County, CA. Kentucky pays $557.08. The RVUs are the same everywhere; the geographic indexes change the dollars.
- Kentucky · this page$557.08
- Los Angeles, CA · California$700.42+$143.34
- Washington, DC area · District of Columbia$703.69+$146.61
- Miami, FL · Florida$644.29+$87.21
- Chicago, IL · Illinois$625.84+$68.76
- Manhattan, NY · New York$701.55+$144.47
- Alaska · Alaska$699.88+$142.80
Other areas in Kentucky first, then benchmark localities. Bars start at $0.
Every other payment area
| Payment locality | Office | Facility |
|---|---|---|
| AlabamaAlabama | $547.24 | — |
| ArkansasArkansas | $539.14 | — |
| ArizonaArizona | $594.79 | — |
| Bakersfield, CACalifornia | $655.62 | — |
| Chico, CACalifornia | $654.71 | — |
| El Centro, CACalifornia | $654.75 | — |
| Fresno, CACalifornia | $654.71 | — |
| Hanford, CACalifornia | $654.71 | — |
| Madera, CACalifornia | $654.71 | — |
| Merced, CACalifornia | $654.71 | — |
| Modesto, CACalifornia | $654.71 | — |
| Napa, CACalifornia | $766.27 | — |
| Oxnard, CACalifornia | $697.96 | — |
| Redding, CACalifornia | $654.71 | — |
| Rest of CaliforniaCalifornia | $654.71 | — |
| Riverside, CACalifornia | $657.69 | — |
| Sacramento, CACalifornia | $689.09 | — |
| Salinas, CACalifornia | $686.56 | — |
| San Diego, CACalifornia | $704.17 | — |
| Marin County, CACalifornia | $813.76 | — |
| San Francisco, CACalifornia | $813.46 | — |
| San Benito County, CACalifornia | $831.61 | — |
| Santa Clara County, CACalifornia | $830.36 | — |
| San Luis Obispo, CACalifornia | $675.26 | — |
| Santa Cruz, CACalifornia | $712.08 | — |
| Santa Maria, CACalifornia | $689.53 | — |
| Santa Rosa, CACalifornia | $719.41 | — |
| Stockton, CACalifornia | $654.71 | — |
| Vallejo, CACalifornia | $765.82 | — |
| Visalia, CACalifornia | $654.71 | — |
| Yuba City, CACalifornia | $654.71 | — |
| ColoradoColorado | $641.00 | — |
| ConnecticutConnecticut | $652.08 | — |
| DelawareDelaware | $604.88 | — |
| Fort Lauderdale, FLFlorida | $624.40 | — |
| Rest of FloridaFlorida | $594.41 | — |
| Atlanta, GAGeorgia | $620.73 | — |
| Rest of GeorgiaGeorgia | $561.01 | — |
| Hawaii, Guam, HIHawaii | $672.59 | — |
| IowaIowa | $564.84 | — |
| IdahoIdaho | $567.91 | — |
| East St. Louis, ILIllinois | $581.81 | — |
| Rest of IllinoisIllinois | $574.40 | — |
| Suburban Chicago, ILIllinois | $631.64 | — |
| IndianaIndiana | $571.38 | — |
| KansasKansas | $560.54 | — |
| New Orleans, LALouisiana | $583.93 | — |
| Rest of LouisianaLouisiana | $555.56 | — |
| Metropolitan Boston, MAMassachusetts | $707.72 | — |
| Rest of MassachusettsMassachusetts | $636.39 | — |
| Baltimore area, MDMaryland | $649.91 | — |
| Rest of MarylandMaryland | $617.14 | — |
| Rest of MaineMaine | $569.26 | — |
| Southern Maine, MEMaine | $603.27 | — |
| Detroit, MIMichigan | $600.36 | — |
| Rest of MichiganMichigan | $570.48 | — |
| MinnesotaMinnesota | $618.41 | — |
| Metropolitan Kansas City, MOMissouri | $581.54 | — |
| Metropolitan St. Louis, MOMissouri | $587.98 | — |
| Rest of MissouriMissouri | $544.71 | — |
| MississippiMississippi | $542.11 | — |
| MontanaMontana | $610.88 | — |
| North CarolinaNorth Carolina | $575.62 | — |
| North DakotaNorth Dakota | $605.55 | — |
| NebraskaNebraska | $568.49 | — |
| New HampshireNew Hampshire | $629.37 | — |
| Northern New JerseyNew Jersey | $695.80 | — |
| Rest of New JerseyNew Jersey | $660.71 | — |
| New MexicoNew Mexico | $573.04 | — |
| NevadaNevada | $609.87 | — |
| NYC suburbs and Long Island, NYNew York | $716.90 | — |
| Poughkeepsie and northern NYC suburbs, NYNew York | $663.78 | — |
| Queens, NYNew York | $709.81 | — |
| Rest of New YorkNew York | $584.33 | — |
| OhioOhio | $569.39 | — |
| OklahomaOklahoma | $557.75 | — |
| Portland, OROregon | $663.63 | — |
| Rest of OregonOregon | $606.31 | — |
| Metropolitan Philadelphia, PAPennsylvania | $634.47 | — |
| Rest of PennsylvaniaPennsylvania | $571.21 | — |
| Puerto RicoPuerto Rico | $616.02 | — |
| Rhode IslandRhode Island | $628.06 | — |
| South CarolinaSouth Carolina | $573.22 | — |
| South DakotaSouth Dakota | $604.91 | — |
| TennesseeTennessee | $563.23 | — |
| Austin, TXTexas | $637.84 | — |
| Beaumont, TXTexas | $567.25 | — |
| Brazoria, TXTexas | $605.61 | — |
| Dallas, TXTexas | $608.83 | — |
| Fort Worth, TXTexas | $604.16 | — |
| Galveston, TXTexas | $607.00 | — |
| Houston, TXTexas | $611.94 | — |
| Rest of TexasTexas | $585.65 | — |
| UtahUtah | $581.30 | — |
| VirginiaVirginia | $600.13 | — |
| Virgin Islands, VIUnited States Virgin Islands | $616.02 | — |
| VermontVermont | $601.67 | — |
| Rest of WashingtonWashington | $635.69 | — |
| King County, WAWashington | $723.95 | — |
| WisconsinWisconsin | $584.59 | — |
| West VirginiaWest Virginia | $552.18 | — |
| WyomingWyoming | $608.56 | — |
77771 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.
$539.14
$743.16
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 | $699.88 | 1 |
| AL | $547.24 | 1 |
| AR | $539.14 | 1 |
| AZ | $594.79 | 1 |
| CA | $654.71–$831.61 | 29 |
| CO | $641.00 | 1 |
| CT | $652.08 | 1 |
| DC | $703.69 | 1 |
| DE | $604.88 | 1 |
| FL | $594.41–$644.29 | 3 |
| GA | $561.01–$620.73 | 2 |
| GU | $672.59 | 1 |
| HI | $672.59 | 1 |
| IA | $564.84 | 1 |
| ID | $567.91 | 1 |
| IL | $574.40–$631.64 | 4 |
| IN | $571.38 | 1 |
| KS | $560.54 | 1 |
| KY | $557.08 | 1 |
| LA | $555.56–$583.93 | 2 |
| MA | $636.39–$707.72 | 2 |
| MD | $617.14–$703.69 | 3 |
| ME | $569.26–$603.27 | 2 |
| MI | $570.48–$600.36 | 2 |
| MN | $618.41 | 1 |
| MO | $544.71–$587.98 | 3 |
| MS | $542.11 | 1 |
| MT | $610.88 | 1 |
| NC | $575.62 | 1 |
| ND | $605.55 | 1 |
| NE | $568.49 | 1 |
| NH | $629.37 | 1 |
| NJ | $660.71–$695.80 | 2 |
| NM | $573.04 | 1 |
| NV | $609.87 | 1 |
| NY | $584.33–$716.90 | 5 |
| OH | $569.39 | 1 |
| OK | $557.75 | 1 |
| OR | $606.31–$663.63 | 2 |
| PA | $571.21–$634.47 | 2 |
| PR | $616.02 | 1 |
| RI | $628.06 | 1 |
| SC | $573.22 | 1 |
| SD | $604.91 | 1 |
| TN | $563.23 | 1 |
| TX | $567.25–$637.84 | 8 |
| UT | $581.30 | 1 |
| VA | $600.13–$703.69 | 2 |
| VI | $616.02 | 1 |
| VT | $601.67 | 1 |
| WA | $635.69–$723.95 | 2 |
| WI | $584.59 | 1 |
| WV | $552.18 | 1 |
| WY | $608.56 | 1 |
How the 77771 rate is calculated
Each of 77771’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 · 77771
RVUs × geographic indexes × conversion factor
Work3.71
3.71 RVUs× 1.000 GPCI
Practice expense14.31
14.31 RVUs× 1.000 GPCI
Malpractice0.27
0.27 RVUs× 1.000 GPCI
Adjusted RVUs
18.2900
Conversion factor
$33.4009
Medicare rate
$610.90
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
The exact Kentucky inputs and CMS source lines
PPRRVU2026_Oct_nonQPP.csv
9,163
- Code
- 77771
- Physician work
- 3.71
- Practice expense
- 14.31
- Malpractice
- 0.27
GPCI2026.csv
55
- Locality
- Kentucky
- Physician work
- 1.000
- Practice expense
- 0.889
- Malpractice
- 0.915
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 3.71 | × 1.000 | 3.7100 |
| Practice expense | 14.31 | × 0.889 | 12.7216 |
| Malpractice | 0.27 | × 0.915 | 0.2471 |
| Total RVUs | 16.6786 | ||
| Conversion factor | × 33.4009 | ||
Office rate, Kentucky$557.08
Office: (3.71 × 1 + 14.31 × 0.889 + 0.27 × 0.915) × $33.4009 = $557.08
Payment rules and modifiers for 77771
The CMS indicators that decide how 77771 is paid alongside other services.
CMS payment indicators · 77771
HDR brachytherapy, interstitial or intracavitary, intermediate
| 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
77771 without 26 · national office
$610.90
HDR brachytherapy, interstitial or intracavitary, intermediate
77771-26 · Professional component
$199.40
Pays only the interpretation and report.
How 77771 has changed in Kentucky
77771 · Office / nonfacility
$557.08
Effective 2026-10-01
The base rate is $20.52 higher than on 2025-10-01, moving from $536.56 to $557.08 (3.8%).
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
$536.56changed to$557.08
- Conversion factor 32.3465 changed to 33.4009
- Work RVU 3.80 changed to 3.71
- Practice expense RVU 14.29 changed to 14.31
- Malpractice RVU 0.28 changed to 0.27
- Practice expense GPCI 0.877 changed to 0.889
- Malpractice GPCI 0.913 changed to 0.915
Held through RVU26B, RVU26C, RVU26D.
January 1, 2025
RVU25A
$546.32changed to$536.56
- Conversion factor 33.2875 changed to 32.3465
- Practice expense RVU 14.10 changed to 14.29
- Malpractice RVU 0.27 changed to 0.28
Held through RVU25B, RVU25C, RVU25D.
March 9, 2024
RVU24AR
$537.40changed to$546.32
- Conversion factor 32.7442 changed to 33.2875
Held through RVU24B, RVU24C, RVU24D.
January 1, 2024
RVU24A
$547.94changed to$537.40
- Conversion factor 33.8872 changed to 32.7442
- Practice expense RVU 13.90 changed to 14.10
- Practice expense GPCI 0.873 changed to 0.877
- Malpractice GPCI 0.870 changed to 0.913
January 1, 2023
RVU23A
$542.89changed to$547.94
- Conversion factor 34.6062 changed to 33.8872
- Practice expense RVU 13.48 changed to 13.90
- Malpractice RVU 0.21 changed to 0.27
- Practice expense GPCI 0.869 changed to 0.873
- Malpractice GPCI 0.827 changed to 0.870
Held through RVU23B, RVU23C, RVU23D.
January 1, 2022
RVU22A
$552.52changed to$542.89
- Conversion factor 34.8931 changed to 34.6062
- Practice expense RVU 13.63 changed to 13.48
- Malpractice RVU 0.23 changed to 0.21
Held through RVU22B, RVU22C, RVU22D.
January 1, 2021
RVU21A
$552.15changed to$552.52
- Conversion factor 36.0896 changed to 34.8931
- Practice expense RVU 12.95 changed to 13.63
- Malpractice RVU 0.22 changed to 0.23
- Practice expense GPCI 0.874 changed to 0.869
- Malpractice GPCI 0.823 changed to 0.827
Held through RVU21B, RVU21C, RVU21D.
January 1, 2020
RVU20A
$557.61changed to$552.15
- Conversion factor 36.0391 changed to 36.0896
- Practice expense RVU 13.05 changed to 12.95
- Malpractice RVU 0.23 changed to 0.22
- Practice expense GPCI 0.880 changed to 0.874
- Malpractice GPCI 0.819 changed to 0.823
Held through RVU20B, RVU20C, RVU20D.
January 1, 2019
RVU19A
$563.02changed to$557.61
- Conversion factor 35.9996 changed to 36.0391
- Practice expense RVU 13.24 changed to 13.05
Held through RVU19B, RVU19C, RVU19D.
January 1, 2018
RVU18AR1
$549.22changed to$563.02
- Conversion factor 35.8887 changed to 35.9996
- Practice expense RVU 12.92 changed to 13.24
- Practice expense GPCI 0.876 changed to 0.880
- Malpractice GPCI 0.807 changed to 0.819
Held through RVU18B, RVU18C, RVU18D.
January 1, 2017
RVU17A
$543.17changed to$549.22
- Conversion factor 35.8043 changed to 35.8887
- Practice expense RVU 12.83 changed to 12.92
- Practice expense GPCI 0.872 changed to 0.876
- Malpractice GPCI 0.795 changed to 0.807
Held through RVU17B, RVU17C, RVU17D.
January 1, 2016
RVU16A
No ratechanged to$543.17
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 | $557.08 | Not available in this setting | RVU26D |
| 2026-07-01 | $557.08 | Not available in this setting | RVU26C |
| 2026-04-01 | $557.08 | Not available in this setting | RVU26B |
| 2026-01-01 | $557.08 | Not available in this setting | RVU26A |
| 2025-10-01 | $536.56 | Not available in this setting | RVU25D |
| 2025-07-01 | $536.56 | Not available in this setting | RVU25C |
| 2025-04-01 | $536.56 | Not available in this setting | RVU25B |
| 2025-01-01 | $536.56 | Not available in this setting | RVU25A |
| 2024-10-01 | $546.32 | Not available in this setting | RVU24D |
| 2024-07-01 | $546.32 | Not available in this setting | RVU24C |
| 2024-04-01 | $546.32 | Not available in this setting | RVU24B |
| 2024-03-09 | $546.32 | Not available in this setting | RVU24AR |
| 2024-01-01 | $537.40 | Not available in this setting | RVU24A |
| 2023-10-01 | $547.94 | Not available in this setting | RVU23D |
| 2023-07-01 | $547.94 | Not available in this setting | RVU23C |
| 2023-04-01 | $547.94 | Not available in this setting | RVU23B |
| 2023-01-01 | $547.94 | Not available in this setting | RVU23A |
| 2022-10-01 | $542.89 | Not available in this setting | RVU22D |
| 2022-07-01 | $542.89 | Not available in this setting | RVU22C |
| 2022-04-01 | $542.89 | Not available in this setting | RVU22B |
| 2022-01-01 | $542.89 | Not available in this setting | RVU22A |
| 2021-10-01 | $552.52 | Not available in this setting | RVU21D |
| 2021-07-01 | $552.52 | Not available in this setting | RVU21C |
| 2021-04-01 | $552.52 | Not available in this setting | RVU21B |
| 2021-01-01 | $552.52 | Not available in this setting | RVU21A |
| 2020-10-01 | $552.15 | Not available in this setting | RVU20D |
| 2020-07-01 | $552.15 | Not available in this setting | RVU20C |
| 2020-04-01 | $552.15 | Not available in this setting | RVU20B |
| 2020-01-01 | $552.15 | Not available in this setting | RVU20A |
| 2019-10-01 | $557.61 | Not available in this setting | RVU19D |
| 2019-07-01 | $557.61 | Not available in this setting | RVU19C |
| 2019-04-01 | $557.61 | Not available in this setting | RVU19B |
| 2019-01-01 | $557.61 | Not available in this setting | RVU19A |
| 2018-10-01 | $563.02 | Not available in this setting | RVU18D |
| 2018-07-01 | $563.02 | Not available in this setting | RVU18C |
| 2018-04-01 | $563.02 | Not available in this setting | RVU18B |
| 2018-01-01 | $563.02 | Not available in this setting | RVU18AR1 |
| 2017-10-01 | $549.22 | Not available in this setting | RVU17D |
| 2017-07-01 | $549.22 | Not available in this setting | RVU17C |
| 2017-04-01 | $549.22 | Not available in this setting | RVU17B |
| 2017-01-01 | $549.22 | Not available in this setting | RVU17A |
| 2016-10-01 | $543.17 | Not available in this setting | RVU16D |
| 2016-07-01 | $543.17 | Not available in this setting | RVU16C |
| 2016-04-01 | $543.17 | Not available in this setting | RVU16B |
| 2016-01-01 | $543.17 | 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 Kentucky rate applies
Kentucky is a Medicare payment area, not a city. Our Census mapping connects it to 553 cities and communities in Kentucky. Some span more than one payment area; confirm with the service ZIP.
- Adairville
- Ages
- Albany
- Alexandria
- Allen
- Allensville
- Anchorage
- Annville
77771 billing questions
How does 77771 differ from 77770 and 77772?
These codes distinguish simple, intermediate, and complex HDR interstitial or intracavitary delivery. Use the level supported by the documented delivery complexity and CPT criteria, not an assumption based only on site.
Is 77771 reported per fraction?
The code covers delivery for one or more fractions. Follow the applicable CPT reporting instructions and document the treatment delivered; do not infer a separate unit for every fraction.
When should modifier 26 or TC be used?
Modifier 26 identifies the professional interpretation component, and TC identifies the technical equipment-and-staff component. Without either modifier, the claim represents the global service.
Does 77771 describe superficial skin brachytherapy?
No. It is for interstitial or intracavitary HDR delivery. Superficial skin HDR treatment is represented by the separate 77767–77768 code family.
What documentation supports the intermediate level?
Document the HDR delivery, the interstitial catheter or intracavitary applicator configuration, and the details that support intermediate rather than simple or complex delivery under CPT criteria.
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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