CPT code 77300: Dosimetry calculation, basic, per calculation2026 Medicare rate & RVUs in Connecticut
A physician-prescribed radiation dose calculation, such as monitor units for a treatment beam, reported for each distinct calculation needed during treatment planning or delivery.
In Connecticut, Medicare pays $71.34 for 77300 in the office.
Check a contract rate as a % of Medicare · 77300 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 77300 covers
This service calculates a radiation dose parameter needed to deliver the physician's prescription, such as the monitor units or treatment time for a beam at a specified depth. Other examples include an off-axis factor, tissue inhomogeneity correction, or gap calculation between adjacent fields. A medical dosimetrist or medical physicist typically prepares the calculation in a hospital radiation oncology department or freestanding treatment center; the radiation oncologist reviews and approves the result.
Report a unit for each distinct physician-prescribed calculation, not automatically for each field. A later plan change supports another unit only when it requires a separately prescribed and documented calculation. Retain the prescription, calculation record, and physician approval. Calculations included in a teletherapy isodose plan or an IMRT plan are not separately reported as 77300 for that plan. CMS prices professional and technical components separately: modifier 26 identifies the physician's professional work, modifier TC identifies the equipment and staff component, and an unmodified claim represents both components.
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 Connecticut compares for 77300
Across 109 of 109 payment localities, the office rate for 77300 runs from $60.04 in Arkansas to $88.95 in San Benito County, CA. Connecticut pays $71.34. The RVUs are the same everywhere; the geographic indexes change the dollars.
- Connecticut · this page$71.34
- Los Angeles, CA · California$75.88+$4.54
- Washington, DC area · District of Columbia$76.51+$5.17
- Miami, FL · Florida$71.05−$0.29
- Chicago, IL · Illinois$69.24−$2.10
- Manhattan, NY · New York$76.61+$5.27
- Alaska · Alaska$79.53+$8.19
Other areas in Connecticut first, then benchmark localities. Bars start at $0.
Every other payment area
| Payment locality | Office | Facility |
|---|---|---|
| AlabamaAlabama | $60.84 | — |
| ArkansasArkansas | $60.04 | — |
| ArizonaArizona | $65.52 | — |
| Bakersfield, CACalifornia | $71.39 | — |
| Chico, CACalifornia | $71.25 | — |
| El Centro, CACalifornia | $71.26 | — |
| Fresno, CACalifornia | $71.25 | — |
| Hanford, CACalifornia | $71.25 | — |
| Madera, CACalifornia | $71.25 | — |
| Merced, CACalifornia | $71.25 | — |
| Modesto, CACalifornia | $71.25 | — |
| Napa, CACalifornia | $82.29 | — |
| Oxnard, CACalifornia | $75.52 | — |
| Redding, CACalifornia | $71.25 | — |
| Rest of CaliforniaCalifornia | $71.25 | — |
| Riverside, CACalifornia | $71.69 | — |
| Sacramento, CACalifornia | $74.70 | — |
| Salinas, CACalifornia | $74.41 | — |
| San Diego, CACalifornia | $76.09 | — |
| Marin County, CACalifornia | $87.08 | — |
| San Francisco, CACalifornia | $87.03 | — |
| San Benito County, CACalifornia | $88.95 | — |
| Santa Clara County, CACalifornia | $88.76 | — |
| San Luis Obispo, CACalifornia | $73.22 | — |
| Santa Cruz, CACalifornia | $76.77 | — |
| Santa Maria, CACalifornia | $74.67 | — |
| Santa Rosa, CACalifornia | $77.55 | — |
| Stockton, CACalifornia | $71.25 | — |
| Vallejo, CACalifornia | $82.23 | — |
| Visalia, CACalifornia | $71.25 | — |
| Yuba City, CACalifornia | $71.25 | — |
| ColoradoColorado | $70.01 | — |
| DelawareDelaware | $66.55 | — |
| Fort Lauderdale, FLFlorida | $68.81 | — |
| Rest of FloridaFlorida | $65.79 | — |
| Atlanta, GAGeorgia | $68.20 | — |
| Rest of GeorgiaGeorgia | $62.45 | — |
| Hawaii, Guam, HIHawaii | $72.84 | — |
| IowaIowa | $62.44 | — |
| IdahoIdaho | $62.77 | — |
| East St. Louis, ILIllinois | $64.83 | — |
| Rest of IllinoisIllinois | $63.91 | — |
| Suburban Chicago, ILIllinois | $69.54 | — |
| IndianaIndiana | $63.11 | — |
| KansasKansas | $62.08 | — |
| KentuckyKentucky | $61.94 | — |
| New Orleans, LALouisiana | $64.62 | — |
| Rest of LouisianaLouisiana | $61.82 | — |
| Metropolitan Boston, MAMassachusetts | $76.69 | — |
| Rest of MassachusettsMassachusetts | $69.61 | — |
| Baltimore area, MDMaryland | $71.11 | — |
| Rest of MarylandMaryland | $67.78 | — |
| Rest of MaineMaine | $62.97 | — |
| Southern Maine, MEMaine | $66.23 | — |
| Detroit, MIMichigan | $66.45 | — |
| Rest of MichiganMichigan | $63.33 | — |
| MinnesotaMinnesota | $67.52 | — |
| Metropolitan Kansas City, MOMissouri | $64.31 | — |
| Metropolitan St. Louis, MOMissouri | $64.94 | — |
| Rest of MissouriMissouri | $60.79 | — |
| MississippiMississippi | $60.43 | — |
| MontanaMontana | $67.13 | — |
| North CarolinaNorth Carolina | $63.59 | — |
| North DakotaNorth Dakota | $66.34 | — |
| NebraskaNebraska | $62.78 | — |
| New HampshireNew Hampshire | $68.84 | — |
| Northern New JerseyNew Jersey | $75.81 | — |
| Rest of New JerseyNew Jersey | $72.28 | — |
| New MexicoNew Mexico | $63.61 | — |
| NevadaNevada | $66.96 | — |
| NYC suburbs and Long Island, NYNew York | $78.21 | — |
| Poughkeepsie and northern NYC suburbs, NYNew York | $72.67 | — |
| Queens, NYNew York | $77.34 | — |
| Rest of New YorkNew York | $64.45 | — |
| OhioOhio | $63.17 | — |
| OklahomaOklahoma | $61.94 | — |
| Portland, OROregon | $72.19 | — |
| Rest of OregonOregon | $66.56 | — |
| Metropolitan Philadelphia, PAPennsylvania | $69.63 | — |
| Rest of PennsylvaniaPennsylvania | $63.31 | — |
| Puerto RicoPuerto Rico | $67.62 | — |
| Rhode IslandRhode Island | $68.88 | — |
| South CarolinaSouth Carolina | $63.46 | — |
| South DakotaSouth Dakota | $66.25 | — |
| TennesseeTennessee | $62.35 | — |
| Austin, TXTexas | $69.68 | — |
| Beaumont, TXTexas | $62.92 | — |
| Brazoria, TXTexas | $66.59 | — |
| Dallas, TXTexas | $66.94 | — |
| Fort Worth, TXTexas | $66.50 | — |
| Galveston, TXTexas | $66.75 | — |
| Houston, TXTexas | $67.48 | — |
| Rest of TexasTexas | $64.67 | — |
| UtahUtah | $64.25 | — |
| VirginiaVirginia | $65.97 | — |
| Virgin Islands, VIUnited States Virgin Islands | $67.62 | — |
| VermontVermont | $66.02 | — |
| Rest of WashingtonWashington | $69.50 | — |
| King County, WAWashington | $78.28 | — |
| WisconsinWisconsin | $64.29 | — |
| West VirginiaWest Virginia | $61.72 | — |
| WyomingWyoming | $66.79 | — |
77300 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.
$60.04
$80.10
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 | $79.53 | 1 |
| AL | $60.84 | 1 |
| AR | $60.04 | 1 |
| AZ | $65.52 | 1 |
| CA | $71.25–$88.95 | 29 |
| CO | $70.01 | 1 |
| CT | $71.34 | 1 |
| DC | $76.51 | 1 |
| DE | $66.55 | 1 |
| FL | $65.79–$71.05 | 3 |
| GA | $62.45–$68.20 | 2 |
| GU | $72.84 | 1 |
| HI | $72.84 | 1 |
| IA | $62.44 | 1 |
| ID | $62.77 | 1 |
| IL | $63.91–$69.54 | 4 |
| IN | $63.11 | 1 |
| KS | $62.08 | 1 |
| KY | $61.94 | 1 |
| LA | $61.82–$64.62 | 2 |
| MA | $69.61–$76.69 | 2 |
| MD | $67.78–$76.51 | 3 |
| ME | $62.97–$66.23 | 2 |
| MI | $63.33–$66.45 | 2 |
| MN | $67.52 | 1 |
| MO | $60.79–$64.94 | 3 |
| MS | $60.43 | 1 |
| MT | $67.13 | 1 |
| NC | $63.59 | 1 |
| ND | $66.34 | 1 |
| NE | $62.78 | 1 |
| NH | $68.84 | 1 |
| NJ | $72.28–$75.81 | 2 |
| NM | $63.61 | 1 |
| NV | $66.96 | 1 |
| NY | $64.45–$78.21 | 5 |
| OH | $63.17 | 1 |
| OK | $61.94 | 1 |
| OR | $66.56–$72.19 | 2 |
| PA | $63.31–$69.63 | 2 |
| PR | $67.62 | 1 |
| RI | $68.88 | 1 |
| SC | $63.46 | 1 |
| SD | $66.25 | 1 |
| TN | $62.35 | 1 |
| TX | $62.92–$69.68 | 8 |
| UT | $64.25 | 1 |
| VA | $65.97–$76.51 | 2 |
| VI | $67.62 | 1 |
| VT | $66.02 | 1 |
| WA | $69.50–$78.28 | 2 |
| WI | $64.29 | 1 |
| WV | $61.72 | 1 |
| WY | $66.79 | 1 |
How the 77300 rate is calculated
Each of 77300’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 · 77300
RVUs × geographic indexes × conversion factor
Work0.60
0.60 RVUs× 1.000 GPCI
Practice expense1.37
1.37 RVUs× 1.000 GPCI
Malpractice0.04
0.04 RVUs× 1.000 GPCI
Adjusted RVUs
2.0100
Conversion factor
$33.4009
Medicare rate
$67.14
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
The exact Connecticut inputs and CMS source lines
PPRRVU2026_Oct_nonQPP.csv
9,047
- Code
- 77300
- Physician work
- 0.60
- Practice expense
- 1.37
- Malpractice
- 0.04
GPCI2026.csv
38
- Locality
- Connecticut
- Physician work
- 1.020
- Practice expense
- 1.077
- Malpractice
- 1.210
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 0.60 | × 1.020 | 0.6120 |
| Practice expense | 1.37 | × 1.077 | 1.4755 |
| Malpractice | 0.04 | × 1.210 | 0.0484 |
| Total RVUs | 2.1359 | ||
| Conversion factor | × 33.4009 | ||
Office rate, Connecticut$71.34
Office: (0.6 × 1.02 + 1.37 × 1.077 + 0.04 × 1.21) × $33.4009 = $71.34
Payment rules and modifiers for 77300
The CMS indicators that decide how 77300 is paid alongside other services.
CMS payment indicators · 77300
Dosimetry calculation, basic, per calculation
| 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
77300 without 26 · national office
$67.14
Dosimetry calculation, basic, per calculation
77300-26 · Professional component
$32.73
Pays only the interpretation and report.
How 77300 has changed in Connecticut
77300 · Office / nonfacility
$71.34
Effective 2026-10-01
The base rate is $1.29 higher than on 2025-10-01, moving from $70.05 to $71.34 (1.8%).
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
$70.05changed to$71.34
- Conversion factor 32.3465 changed to 33.4009
- Work RVU 0.62 changed to 0.60
- Practice expense RVU 1.36 changed to 1.37
- Work GPCI 1.022 changed to 1.020
- Practice expense GPCI 1.091 changed to 1.077
- Malpractice GPCI 1.207 changed to 1.210
Held through RVU26B, RVU26C, RVU26D.
January 1, 2025
RVU25A
$70.64changed to$70.05
- Conversion factor 33.2875 changed to 32.3465
- Practice expense RVU 1.32 changed to 1.36
Held through RVU25B, RVU25C, RVU25D.
March 9, 2024
RVU24AR
$69.48changed to$70.64
- Conversion factor 32.7442 changed to 33.2875
Held through RVU24B, RVU24C, RVU24D.
January 1, 2024
RVU24A
$72.00changed to$69.48
- Conversion factor 33.8872 changed to 32.7442
- Practice expense RVU 1.30 changed to 1.32
- Malpractice RVU 0.05 changed to 0.04
- Work GPCI 1.030 changed to 1.022
- Practice expense GPCI 1.102 changed to 1.091
- Malpractice GPCI 1.070 changed to 1.207
January 1, 2023
RVU23A
$71.79changed to$72.00
- Conversion factor 34.6062 changed to 33.8872
- Practice expense RVU 1.26 changed to 1.30
- Malpractice RVU 0.03 changed to 0.05
- Work GPCI 1.037 changed to 1.030
- Practice expense GPCI 1.114 changed to 1.102
- Malpractice GPCI 0.934 changed to 1.070
Held through RVU23B, RVU23C, RVU23D.
January 1, 2022
RVU22A
$73.17changed to$71.79
- Conversion factor 34.8931 changed to 34.6062
- Practice expense RVU 1.28 changed to 1.26
Held through RVU22B, RVU22C, RVU22D.
January 1, 2021
RVU21A
$73.62changed to$73.17
- Conversion factor 36.0896 changed to 34.8931
- Practice expense RVU 1.23 changed to 1.28
- Work GPCI 1.029 changed to 1.037
- Practice expense GPCI 1.113 changed to 1.114
- Malpractice GPCI 1.094 changed to 0.934
Held through RVU21B, RVU21C, RVU21D.
January 1, 2020
RVU20A
$73.92changed to$73.62
- Conversion factor 36.0391 changed to 36.0896
- Malpractice RVU 0.04 changed to 0.03
- Work GPCI 1.021 changed to 1.029
- Practice expense GPCI 1.112 changed to 1.113
- Malpractice GPCI 1.255 changed to 1.094
Held through RVU20B, RVU20C, RVU20D.
January 1, 2019
RVU19A
$74.64changed to$73.92
- Conversion factor 35.9996 changed to 36.0391
- Practice expense RVU 1.25 changed to 1.23
Held through RVU19B, RVU19C, RVU19D.
January 1, 2018
RVU18AR1
$73.86changed to$74.64
- Conversion factor 35.8887 changed to 35.9996
- Practice expense RVU 1.23 changed to 1.25
- Work GPCI 1.023 changed to 1.021
- Practice expense GPCI 1.117 changed to 1.112
- Malpractice GPCI 1.244 changed to 1.255
Held through RVU18B, RVU18C, RVU18D.
January 1, 2017
RVU17A
$73.46changed to$73.86
- Conversion factor 35.8043 changed to 35.8887
- Practice expense RVU 1.22 changed to 1.23
- Work GPCI 1.024 changed to 1.023
- Practice expense GPCI 1.121 changed to 1.117
- Malpractice GPCI 1.232 changed to 1.244
Held through RVU17B, RVU17C, RVU17D.
January 1, 2016
RVU16A
$69.30changed to$73.46
- Conversion factor 35.9335 changed to 35.8043
- Practice expense RVU 1.11 changed to 1.22
Held through RVU16B, RVU16C, RVU16D.
July 1, 2015
RVU15C
$68.95changed to$69.30
- Conversion factor 35.7547 changed to 35.9335
Held through RVU15D.
January 1, 2015
RVU15A
$73.28changed to$68.95
- Conversion factor 35.8228 changed to 35.7547
- Practice expense RVU 1.22 changed to 1.11
- Practice expense GPCI 1.116 changed to 1.121
- Malpractice GPCI 1.234 changed to 1.232
Held through RVU15B.
January 1, 2014
RVU14A
$72.38changed to$73.28
- Conversion factor 34.0230 changed to 35.8228
- Practice expense RVU 1.30 changed to 1.22
- Practice expense GPCI 1.110 changed to 1.116
- Malpractice GPCI 1.235 changed to 1.234
Held through RVU14B, RVU14C, RVU14D.
January 1, 2013
RVU13AR
Earliest loaded release: $72.38
Held through RVU13B, RVU13C, RVU13D.
| Effective from | Office | Facility | CMS release |
|---|---|---|---|
| 2026-10-01 | $71.34 | Not available in this setting | RVU26D |
| 2026-07-01 | $71.34 | Not available in this setting | RVU26C |
| 2026-04-01 | $71.34 | Not available in this setting | RVU26B |
| 2026-01-01 | $71.34 | Not available in this setting | RVU26A |
| 2025-10-01 | $70.05 | Not available in this setting | RVU25D |
| 2025-07-01 | $70.05 | Not available in this setting | RVU25C |
| 2025-04-01 | $70.05 | Not available in this setting | RVU25B |
| 2025-01-01 | $70.05 | Not available in this setting | RVU25A |
| 2024-10-01 | $70.64 | Not available in this setting | RVU24D |
| 2024-07-01 | $70.64 | Not available in this setting | RVU24C |
| 2024-04-01 | $70.64 | Not available in this setting | RVU24B |
| 2024-03-09 | $70.64 | Not available in this setting | RVU24AR |
| 2024-01-01 | $69.48 | Not available in this setting | RVU24A |
| 2023-10-01 | $72.00 | Not available in this setting | RVU23D |
| 2023-07-01 | $72.00 | Not available in this setting | RVU23C |
| 2023-04-01 | $72.00 | Not available in this setting | RVU23B |
| 2023-01-01 | $72.00 | Not available in this setting | RVU23A |
| 2022-10-01 | $71.79 | Not available in this setting | RVU22D |
| 2022-07-01 | $71.79 | Not available in this setting | RVU22C |
| 2022-04-01 | $71.79 | Not available in this setting | RVU22B |
| 2022-01-01 | $71.79 | Not available in this setting | RVU22A |
| 2021-10-01 | $73.17 | Not available in this setting | RVU21D |
| 2021-07-01 | $73.17 | Not available in this setting | RVU21C |
| 2021-04-01 | $73.17 | Not available in this setting | RVU21B |
| 2021-01-01 | $73.17 | Not available in this setting | RVU21A |
| 2020-10-01 | $73.62 | Not available in this setting | RVU20D |
| 2020-07-01 | $73.62 | Not available in this setting | RVU20C |
| 2020-04-01 | $73.62 | Not available in this setting | RVU20B |
| 2020-01-01 | $73.62 | Not available in this setting | RVU20A |
| 2019-10-01 | $73.92 | Not available in this setting | RVU19D |
| 2019-07-01 | $73.92 | Not available in this setting | RVU19C |
| 2019-04-01 | $73.92 | Not available in this setting | RVU19B |
| 2019-01-01 | $73.92 | Not available in this setting | RVU19A |
| 2018-10-01 | $74.64 | Not available in this setting | RVU18D |
| 2018-07-01 | $74.64 | Not available in this setting | RVU18C |
| 2018-04-01 | $74.64 | Not available in this setting | RVU18B |
| 2018-01-01 | $74.64 | Not available in this setting | RVU18AR1 |
| 2017-10-01 | $73.86 | Not available in this setting | RVU17D |
| 2017-07-01 | $73.86 | Not available in this setting | RVU17C |
| 2017-04-01 | $73.86 | Not available in this setting | RVU17B |
| 2017-01-01 | $73.86 | Not available in this setting | RVU17A |
| 2016-10-01 | $73.46 | Not available in this setting | RVU16D |
| 2016-07-01 | $73.46 | Not available in this setting | RVU16C |
| 2016-04-01 | $73.46 | Not available in this setting | RVU16B |
| 2016-01-01 | $73.46 | Not available in this setting | RVU16A |
| 2015-10-01 | $69.30 | Not available in this setting | RVU15D |
| 2015-07-01 | $69.30 | Not available in this setting | RVU15C |
| 2015-04-01 | $68.95 | Not available in this setting | RVU15B |
| 2015-01-01 | $68.95 | Not available in this setting | RVU15A |
| 2014-10-01 | $73.28 | Not available in this setting | RVU14D |
| 2014-07-01 | $73.28 | Not available in this setting | RVU14C |
| 2014-04-01 | $73.28 | Not available in this setting | RVU14B |
| 2014-01-01 | $73.28 | Not available in this setting | RVU14A |
| 2013-10-01 | $72.38 | Not available in this setting | RVU13D |
| 2013-07-01 | $72.38 | Not available in this setting | RVU13C |
| 2013-04-01 | $72.38 | Not available in this setting | RVU13B |
| 2013-01-01 | $72.38 | Not available in this setting | RVU13AR |
Where the Connecticut rate applies
Connecticut is a Medicare payment area, not a city. Our Census mapping connects it to 215 cities and communities in Connecticut. Some span more than one payment area; confirm with the service ZIP.
- Ansonia
- Ball Pond
- Baltic
- Bantam
- Bethel
- Bethlehem Village
- Bigelow Corners
- Blue Hills
77300 billing questions
How many units can be reported?
Report one unit per distinct calculation prescribed by the physician, not automatically one per treatment field or beam. A later plan change supports another unit when a new calculation is prescribed and documented.
Can this be billed with an isodose plan such as 77306 or 77307?
Do not separately report calculations included in the teletherapy isodose plan. A calculation outside that plan must be separately prescribed and documented.
Is it separately reportable with IMRT planning?
No, not for calculations included in the IMRT plan reported with 77301. Do not add units of 77300 for that plan's beams.
Which modifier applies when the hospital bills the technical side?
The hospital reports its technical component with modifier TC; the physician reports the professional component with modifier 26. An entity furnishing both components reports the global service without either modifier.
What documentation supports the claim?
Keep the physician's prescription or order, a worksheet or planning-system record identifying each distinct calculation, and the physician's approval of the results.
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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