CPT code 77423: Neutron beam treatment, complex delivery2026 Medicare rate & RVUs in South Carolina
Reports complex technical delivery of neutron-beam radiation, a specialized treatment used for selected malignancies such as salivary-gland adenoid cystic carcinoma.
CMS doesn’t publish a rate for 77423 in South Carolina.
Check a contract rate as a % of Medicare · 77423 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 77423 covers
This code identifies complex radiation treatment delivered with a neutron beam. Neutron therapy is used for selected malignancies, including adenoid cystic carcinoma of the salivary glands. It is provided at specialized radiation oncology centers equipped for neutron treatment. The radiation oncologist directs the treatment course, while the facility’s radiation therapy team delivers the planned beam and reports the technical service.
Medicare assigns this CPT code physician fee schedule status C, or carrier priced: CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim. The code covers the technical component only; a separate code covers interpretation. It represents neutron-beam delivery, not the physician’s interpretation or radiation treatment management.
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 South Carolina compares for 77423
- South Carolina · this pageUnavailable
- Los Angeles, CA · CaliforniaUnavailable
- Washington, DC area · District of ColumbiaUnavailable
- Miami, FL · FloridaUnavailable
- Chicago, IL · IllinoisUnavailable
- Manhattan, NY · New YorkUnavailable
- Alaska · AlaskaUnavailable
Other areas in South Carolina first, then benchmark localities. Bars start at $0.
Every other payment area
77423 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.
View every state and territory as a table
| State / territory | Office rate range | Localities |
|---|---|---|
| AK | No published base rate | 1 |
| AL | No published base rate | 1 |
| AR | No published base rate | 1 |
| AZ | No published base rate | 1 |
| CA | No published base rate | 29 |
| CO | No published base rate | 1 |
| CT | No published base rate | 1 |
| DC | No published base rate | 1 |
| DE | No published base rate | 1 |
| FL | No published base rate | 3 |
| GA | No published base rate | 2 |
| GU | No published base rate | 1 |
| HI | No published base rate | 1 |
| IA | No published base rate | 1 |
| ID | No published base rate | 1 |
| IL | No published base rate | 4 |
| IN | No published base rate | 1 |
| KS | No published base rate | 1 |
| KY | No published base rate | 1 |
| LA | No published base rate | 2 |
| MA | No published base rate | 2 |
| MD | No published base rate | 3 |
| ME | No published base rate | 2 |
| MI | No published base rate | 2 |
| MN | No published base rate | 1 |
| MO | No published base rate | 3 |
| MS | No published base rate | 1 |
| MT | No published base rate | 1 |
| NC | No published base rate | 1 |
| ND | No published base rate | 1 |
| NE | No published base rate | 1 |
| NH | No published base rate | 1 |
| NJ | No published base rate | 2 |
| NM | No published base rate | 1 |
| NV | No published base rate | 1 |
| NY | No published base rate | 5 |
| OH | No published base rate | 1 |
| OK | No published base rate | 1 |
| OR | No published base rate | 2 |
| PA | No published base rate | 2 |
| PR | No published base rate | 1 |
| RI | No published base rate | 1 |
| SC | No published base rate | 1 |
| SD | No published base rate | 1 |
| TN | No published base rate | 1 |
| TX | No published base rate | 8 |
| UT | No published base rate | 1 |
| VA | No published base rate | 2 |
| VI | No published base rate | 1 |
| VT | No published base rate | 1 |
| WA | No published base rate | 2 |
| WI | No published base rate | 1 |
| WV | No published base rate | 1 |
| WY | No published base rate | 1 |
How the 77423 rate is calculated
Each of 77423’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 · 77423
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense0.00
0.00 RVUs× 1.000 GPCI
Malpractice0.00
0.00 RVUs× 1.000 GPCI
Adjusted RVUs
0.0000
Conversion factor
$33.4009
Medicare rate
$0.00
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 77423
The CMS indicators that decide how 77423 is paid alongside other services.
CMS payment indicators · 77423
Neutron beam treatment, complex delivery
| 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 | 3 | Technical component only. |
How 77423 has changed in South Carolina
77423 · Office / nonfacility
Rate unavailable
Effective 2026-10-01
A rate is unavailable in one of these releases, so a change cannot be calculated.
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, 2016
RVU16A
$59.83changed toNo rate
Held through RVU16B, RVU16C, RVU16D, RVU17A, RVU17B, RVU17C, RVU17D, RVU18AR1, RVU18B, RVU18C, RVU18D, RVU19A, RVU19B, RVU19C, RVU19D, RVU20A, RVU20B, RVU20C, RVU20D, RVU21A, RVU21B, RVU21C, RVU21D, RVU22A, RVU22B, RVU22C, RVU22D, RVU23A, RVU23B, RVU23C, RVU23D, RVU24A, RVU24AR, RVU24B, RVU24C, RVU24D, RVU25A, RVU25B, RVU25C, RVU25D, RVU26A, RVU26B, RVU26C, RVU26D.
July 1, 2015
RVU15C
$59.53changed to$59.83
- Conversion factor 35.7547 changed to 35.9335
Held through RVU15D.
January 1, 2015
RVU15A
$45.26changed to$59.53
- Conversion factor 35.8228 changed to 35.7547
- Practice expense RVU 1.38 changed to 1.81
- Malpractice RVU 0.01 changed to 0.02
- Practice expense GPCI 0.911 changed to 0.912
- Malpractice GPCI 0.618 changed to 0.715
Held through RVU15B.
January 1, 2014
RVU14A
$261.82changed to$45.26
- Conversion factor 34.0230 changed to 35.8228
- Practice expense RVU 8.46 changed to 1.38
- Practice expense GPCI 0.909 changed to 0.911
- Malpractice GPCI 0.520 changed to 0.618
Held through RVU14B, RVU14C, RVU14D.
January 1, 2013
RVU13AR
Earliest loaded release: $261.82
Held through RVU13B, RVU13C, RVU13D.
| Effective from | Office | Facility | CMS release |
|---|---|---|---|
| 2026-10-01 | Contractor-priced | Contractor-priced | RVU26D |
| 2026-07-01 | Contractor-priced | Contractor-priced | RVU26C |
| 2026-04-01 | Contractor-priced | Contractor-priced | RVU26B |
| 2026-01-01 | Contractor-priced | Contractor-priced | RVU26A |
| 2025-10-01 | Contractor-priced | Contractor-priced | RVU25D |
| 2025-07-01 | Contractor-priced | Contractor-priced | RVU25C |
| 2025-04-01 | Contractor-priced | Contractor-priced | RVU25B |
| 2025-01-01 | Contractor-priced | Contractor-priced | RVU25A |
| 2024-10-01 | Contractor-priced | Contractor-priced | RVU24D |
| 2024-07-01 | Contractor-priced | Contractor-priced | RVU24C |
| 2024-04-01 | Contractor-priced | Contractor-priced | RVU24B |
| 2024-03-09 | Contractor-priced | Contractor-priced | RVU24AR |
| 2024-01-01 | Contractor-priced | Contractor-priced | RVU24A |
| 2023-10-01 | Contractor-priced | Contractor-priced | RVU23D |
| 2023-07-01 | Contractor-priced | Contractor-priced | RVU23C |
| 2023-04-01 | Contractor-priced | Contractor-priced | RVU23B |
| 2023-01-01 | Contractor-priced | Contractor-priced | RVU23A |
| 2022-10-01 | Contractor-priced | Contractor-priced | RVU22D |
| 2022-07-01 | Contractor-priced | Contractor-priced | RVU22C |
| 2022-04-01 | Contractor-priced | Contractor-priced | RVU22B |
| 2022-01-01 | Contractor-priced | Contractor-priced | RVU22A |
| 2021-10-01 | Contractor-priced | Contractor-priced | RVU21D |
| 2021-07-01 | Contractor-priced | Contractor-priced | RVU21C |
| 2021-04-01 | Contractor-priced | Contractor-priced | RVU21B |
| 2021-01-01 | Contractor-priced | Contractor-priced | RVU21A |
| 2020-10-01 | Contractor-priced | Contractor-priced | RVU20D |
| 2020-07-01 | Contractor-priced | Contractor-priced | RVU20C |
| 2020-04-01 | Contractor-priced | Contractor-priced | RVU20B |
| 2020-01-01 | Contractor-priced | Contractor-priced | RVU20A |
| 2019-10-01 | Contractor-priced | Contractor-priced | RVU19D |
| 2019-07-01 | Contractor-priced | Contractor-priced | RVU19C |
| 2019-04-01 | Contractor-priced | Contractor-priced | RVU19B |
| 2019-01-01 | Contractor-priced | Contractor-priced | RVU19A |
| 2018-10-01 | Contractor-priced | Contractor-priced | RVU18D |
| 2018-07-01 | Contractor-priced | Contractor-priced | RVU18C |
| 2018-04-01 | Contractor-priced | Contractor-priced | RVU18B |
| 2018-01-01 | Contractor-priced | Contractor-priced | RVU18AR1 |
| 2017-10-01 | Contractor-priced | Contractor-priced | RVU17D |
| 2017-07-01 | Contractor-priced | Contractor-priced | RVU17C |
| 2017-04-01 | Contractor-priced | Contractor-priced | RVU17B |
| 2017-01-01 | Contractor-priced | Contractor-priced | RVU17A |
| 2016-10-01 | Contractor-priced | Contractor-priced | RVU16D |
| 2016-07-01 | Contractor-priced | Contractor-priced | RVU16C |
| 2016-04-01 | Contractor-priced | Contractor-priced | RVU16B |
| 2016-01-01 | Contractor-priced | Contractor-priced | RVU16A |
| 2015-10-01 | $59.83 | Not available in this setting | RVU15D |
| 2015-07-01 | $59.83 | Not available in this setting | RVU15C |
| 2015-04-01 | $59.53 | Not available in this setting | RVU15B |
| 2015-01-01 | $59.53 | Not available in this setting | RVU15A |
| 2014-10-01 | $45.26 | Not available in this setting | RVU14D |
| 2014-07-01 | $45.26 | Not available in this setting | RVU14C |
| 2014-04-01 | $45.26 | Not available in this setting | RVU14B |
| 2014-01-01 | $45.26 | Not available in this setting | RVU14A |
| 2013-10-01 | $261.82 | Not available in this setting | RVU13D |
| 2013-07-01 | $261.82 | Not available in this setting | RVU13C |
| 2013-04-01 | $261.82 | Not available in this setting | RVU13B |
| 2013-01-01 | $261.82 | Not available in this setting | RVU13AR |
Where the South Carolina rate applies
South Carolina is a Medicare payment area, not a city. Our Census mapping connects it to 475 cities and communities in South Carolina. Some span more than one payment area; confirm with the service ZIP.
- Abbeville
- Abney Crossroads
- Adams Run
- Aiken
- Alcolu
- Allendale
- Anderson
- Andrews
77423 billing questions
How is this different from radiation delivery levels 1, 2, and 3?
This code is for complex neutron-beam delivery. Codes 77402, 77407, and 77412 identify radiation treatment delivery by level rather than neutron-beam treatment.
Does this code include the physician’s interpretation?
No. It covers the technical component only; interpretation is reported separately.
How does Medicare determine payment?
The physician fee schedule status is C, or carrier priced. The Medicare Administrative Contractor sets payment for each claim; CMS publishes no national payment.
Is radiation treatment management included?
This code reports technical neutron-beam delivery, not radiation treatment management. Code 77427 describes radiation treatment management in five-treatment increments.
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
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