CPT code 77423: Neutron beam treatment, complex delivery2026 Medicare rate & RVUs in Missouri
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 an office rate for 77423 in Missouri.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
Your location
On this page 9 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.
Where 77423 pays more and less in Missouri
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City, MO | Unavailable | Unavailable |
| Metropolitan St. Louis, MO | Unavailable | Unavailable |
| Rest of Missouri | Unavailable | Unavailable |
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. |
77423 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 77424Intraoperative radiationX-ray delivery
- 77424 describes intraoperative radiation delivery using x-rays. Use 77423 for complex neutron-beam delivery, not the intraoperative x-ray method.
- 77425Intraoperative radiationElectron beam
- 77425 describes intraoperative radiation delivery using electrons. It differs from the neutron-beam treatment reported with 77423.
- 77412Radiation deliveryComplex treatment
- 77412 is a level-based radiation treatment delivery code. 77423 identifies complex neutron-beam delivery specifically.
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
Fee sheets
Put 77423 and the rest of your codes on one sheet
Your codes at your locality, with payer contracts beside Medicare.
Build my fee sheet