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CPT code 77423: Neutron beam treatment, complex delivery2026 Medicare rate & RVUs

Reports complex technical delivery of neutron-beam radiation, a specialized treatment used for selected malignancies such as salivary-gland adenoid cystic carcinoma.

CMS RVU26DEffective Oct 1, 2026109 payment localities

Medicare rate · 77423

Neutron beam treatment, complex delivery

Office or facility?

Work RVUs
0
Total RVUs
0.00
Global days
XXX

National rate · 2026

—

Not priced in the facility setting.

See every locality for 77423 →Billed by an NP, PA or therapist? →

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

Medicare pays by the payment locality where the service is performed.

On this page 10 sections
  1. Medicare rate
  2. What 77423 covers
  3. By payment locality
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Similar codes
  8. Related codes
  9. Billing questions
  10. Sources

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

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

77423 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailableUnavailable
AlaskaUnavailableUnavailable
ArizonaUnavailableUnavailable
ArkansasUnavailableUnavailable
Atlanta, GAUnavailableUnavailable
Austin, TXUnavailableUnavailable
Bakersfield, CAUnavailableUnavailable
Baltimore area, MDUnavailableUnavailable
Beaumont, TXUnavailableUnavailable
Brazoria, TXUnavailableUnavailable

77423 rates by state

Office rate range in each state. Select a state to see its payment localities.

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

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
77423 office rate range by state
State / territoryOffice rate rangeLocalities
AKNo published base rate1
ALNo published base rate1
ARNo published base rate1
AZNo published base rate1
CANo published base rate29
CONo published base rate1
CTNo published base rate1
DCNo published base rate1
DENo published base rate1
FLNo published base rate3
GANo published base rate2
GUNo published base rate1
HINo published base rate1
IANo published base rate1
IDNo published base rate1
ILNo published base rate4
INNo published base rate1
KSNo published base rate1
KYNo published base rate1
LANo published base rate2
MANo published base rate2
MDNo published base rate3
MENo published base rate2
MINo published base rate2
MNNo published base rate1
MONo published base rate3
MSNo published base rate1
MTNo published base rate1
NCNo published base rate1
NDNo published base rate1
NENo published base rate1
NHNo published base rate1
NJNo published base rate2
NMNo published base rate1
NVNo published base rate1
NYNo published base rate5
OHNo published base rate1
OKNo published base rate1
ORNo published base rate2
PANo published base rate2
PRNo published base rate1
RINo published base rate1
SCNo published base rate1
SDNo published base rate1
TNNo published base rate1
TXNo published base rate8
UTNo published base rate1
VANo published base rate2
VINo published base rate1
VTNo published base rate1
WANo published base rate2
WINo published base rate1
WVNo published base rate1
WYNo published base rate1

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

Office or facility?

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

RuleCMS valueWhat it means
Global periodXXXThe global surgery concept doesn’t apply.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)0Not paid without supporting documentation.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical3Technical component only.

77423 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • 77423

    Neutron beam treatment, complex delivery0 wRVU

    Not priced

  • 77424

    Intraoperative radiation, X-ray delivery0 wRVU

    Not priced

  • 77425

    Intraoperative radiation, electron beam0 wRVU

    Not priced

  • 77412

    Radiation delivery, complex treatment0 wRVU

    $443.56

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.

Codes related to 77423

Related codes aren’t interchangeable: bill the code that matches the service performed.

Codes related to 77423
CodeHow it relatesNational office range
Used instead
77402Radiation delivery, level 1Radiation treatment delivery level 1; distinguishes level-based delivery from complex neutron-beam treatment.$70.35–$117.88
77407Radiation delivery, level 2Radiation treatment delivery level 2; not the complex neutron-beam delivery service.$265.57–$445.15
77412Radiation delivery, complex treatmentRadiation treatment delivery level 3; identifies level-based delivery rather than neutron-beam treatment.$380.22–$637.50

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

Open CMS sourceHow we calculate rates

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