$2,099.52
Choose 77301 for the IMRT treatment dose plan; 77338 represents the MLC device design associated with that plan.
On this page
CMS RVU26D · Effective 2026-10-01
77338 MLC design Medicare reimbursement rates in Connecticut
Reports design of multileaf collimator devices that shape radiation fields for intensity-modulated radiation therapy, counted per IMRT plan. Compare 77338 office and facility rates across CMS payment localities in Connecticut.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 77338 in Connecticut?
Connecticut has 1 payment locality in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the payment area shown below, using the same CMS release.
Office / nonfacility
$504.69
1 of 1 localities have a supported rate.
Payment area: Connecticut
One mapped payment locality.
Facility setting
No supported rate
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Radiation oncology
About 77338: IMRT multileaf collimator design
Reports design of multileaf collimator devices that shape radiation fields for intensity-modulated radiation therapy, counted per IMRT plan.
This service covers planning the multileaf collimator (MLC) leaf positions needed to shape and modulate radiation fields for an intensity-modulated radiation therapy (IMRT) plan. A medical physicist or dosimetrist typically performs the technical design work as part of radiation treatment planning, with the radiation oncologist directing the treatment approach. The work supports delivery of the planned dose to the target while shaping radiation around nearby normal tissues.
Report the service per IMRT plan, not per treatment fraction. Documentation should connect the MLC design to the specific IMRT plan and identify the design work performed. CMS recognizes professional and technical components: modifier 26 identifies the professional component, modifier TC identifies the technical component, and an unmodified claim represents the global service. The IMRT dose plan itself is reported separately when supported; MLC device design is distinct from dose calculation and from design of other treatment aids.
CMS billing rules for 77338
- Professional and technical components
- Diagnostic test with a professional component (modifier 26, interpretation) and a technical component (modifier TC, equipment and staff); billing without a modifier is the global service.
Where the value comes from
- Work RVU4.18 · 29%
- Practice expense (office) RVU9.79 · 69%
- Malpractice RVU0.25 · 2%
211.7K
Medicare services in 2024 · #374 by national volume
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.
77338 compared with similar codes
Office rates for Connecticut, from the same CMS release.
$71.34
77300 represents a radiation dose calculation, not design of the MLC leaf pattern for an IMRT plan.
$43.18
77332 concerns a simple radiation treatment aid. 77338 is specific to MLC design for IMRT, rather than a general treatment aid.
Compare 77338 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
1 of 1 payment localities
Connecticut →
Office / nonfacility
$504.69
Facility
Unavailable
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How this local rate is calculated
Each RVU component is multiplied by its own geographic practice cost index (GPCI). The three adjusted components are added, then multiplied by the conversion factor. These are the inputs used for 77338 in Connecticut.
PPRRVU2026_Oct_nonQPP.csv
9,084
- Code
- 77338
- Physician work
- 4.18
- Practice expense
- 9.79
- Malpractice
- 0.25
GPCI2026.csv
38
- Locality
- Connecticut
- Physician work
- 1.020
- Practice expense
- 1.077
- Malpractice
- 1.210
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 4.18 | × 1.020 | 4.2636 |
| Practice expense | 9.79 | × 1.077 | 10.5438 |
| Malpractice | 0.25 | × 1.210 | 0.3025 |
| Total RVUs | 15.1099 | ||
| Conversion factor | × 33.4009 | ||
Office / nonfacility rate, Connecticut$504.69
Explore RVUs, geographic factors and the full formula
Office / nonfacility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 4.18 | 1.02 |
| Practice expense | 9.79 | 1.077 |
| Malpractice | 0.25 | 1.21 |
(4.18 × 1.02 + 9.79 × 1.077 + 0.25 × 1.21) × $33.4009 = $504.69
The office and facility calculations use their respective practice-expense RVUs. The facility amount here is the physician fee, not a separate hospital or facility bill.
77338 billing questions
How is 77338 distinguished from 77301?
77338 represents the MLC device design for an IMRT plan. 77301 represents the IMRT treatment planning work, including the dose plan; the services describe different parts of planning.
Is 77338 reported per treatment fraction or per plan?
Report it per IMRT plan, rather than once for each delivered fraction.
Which modifier identifies each component?
Use modifier 26 for the professional component and modifier TC for the technical component. Submit without a component modifier for the global service.
Does 77338 include the IMRT dose calculation?
No. It describes MLC device design; the dose-planning work is represented separately when applicable and documented.
What documentation supports 77338?
The record should identify the IMRT plan and show the MLC design work performed for that plan. It should support the per-plan unit reported.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
9,08177334,26,Radiation treatment aid(s),A,,1.12,0.63,,0.63,,0.05,1.80,1.80,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,08277334,TC,Radiation treatment aid(s),A,,0.00,1.97,,1.97,NA,0.01,1.98,1.98,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,08377336,,Radiation physics consult,A,,0.00,2.69,,2.69,NA,0.07,2.76,2.76,3,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,08477338,,Design mlc device for imrt,A,,4.18,9.79,,9.79,NA,0.25,14.22,14.22,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,08577338,26,Design mlc device for imrt,A,,4.18,2.38,,2.38,,0.18,6.74,6.74,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,08677338,TC,Design mlc device for imrt,A,,0.00,7.41,,7.41,NA,0.07,7.48,7.48,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,08777370,,Radiation physics consult,A,,0.00,4.37,,4.37,NA,0.15,4.52,4.52,3,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
3501112,CA,70,YUBA CITY,1.017,1.096,0.536
3601112,CA,75,REST OF CALIFORNIA,1.017,1.096,0.536
3704112,CO,01,COLORADO,1.012,1.064,0.781
3813102,CT,00,CONNECTICUT,1.020,1.077,1.210
3912202,DC,01,DC + MD/VA SUBURBS,1.054,1.178,1.113
4012102,DE,01,DELAWARE,1.005,0.988,0.899
4109102,FL,03,FORT LAUDERDALE,1.000,1.013,1.808