$66.55
77300 represents routine radiation dose calculation. Choose 77331 when specialized measurement, such as TLD or microdosimetry, is performed.
On this page
CMS RVU26D · Effective 2026-10-01
77331 Radiation dosimetry Medicare reimbursement rates in Delaware
Reports specialized radiation dose measurement, such as TLD-based dosimetry, when a radiation oncology team needs more than routine treatment-planning calculations. Compare 77331 office and facility rates across CMS payment localities in Delaware.
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 77331 in Delaware?
Delaware 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
$64.68
1 of 1 localities have a supported rate.
Payment area: Delaware
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 77331: Special radiation dose measurement
Reports specialized radiation dose measurement, such as TLD-based dosimetry, when a radiation oncology team needs more than routine treatment-planning calculations.
This service covers specialized measurement of radiation dose, including methods such as thermoluminescent dosimetry (TLD) or microdosimetry. A radiation oncology physicist typically performs or interprets the work, with technical staff and measurement equipment supporting the test. It may be used when the team needs a patient-specific dose measurement or verification beyond routine dose calculations in a radiation treatment plan.
Select the code for the specialized measurement actually performed, not simply because a treatment plan includes dose calculations. Documentation should identify the measurement method, its clinical purpose, and the findings or interpretation. CMS treats the service as having professional and technical components: report modifier 26 for the interpretation, modifier TC for the equipment and staff, or neither modifier when billing the global service. The record should support the component billed and show that the specialized measurement was performed.
CMS billing rules for 77331
- 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 RVU0.85 · 44%
- Practice expense (office) RVU1.05 · 54%
- Malpractice RVU0.05 · 3%
23.6K
Medicare services in 2024 · #1072 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.
77331 compared with similar codes
Office rates for Delaware, from the same CMS release.
$93.77
77321 is for a special teletherapy port plan. It addresses treatment planning, while 77331 represents specialized dose measurement.
$148.71
77370 represents a special radiation physics consultation. Use 77331 for a specialized dose measurement, not merely a physics review or consultation.
Compare 77331 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
Delaware →
Office / nonfacility
$64.68
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 77331 in Delaware.
PPRRVU2026_Oct_nonQPP.csv
9,071
- Code
- 77331
- Physician work
- 0.85
- Practice expense
- 1.05
- Malpractice
- 0.05
GPCI2026.csv
40
- Locality
- Delaware
- Physician work
- 1.005
- Practice expense
- 0.988
- Malpractice
- 0.899
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 0.85 | × 1.005 | 0.8542 |
| Practice expense | 1.05 | × 0.988 | 1.0374 |
| Malpractice | 0.05 | × 0.899 | 0.0450 |
| Total RVUs | 1.9366 | ||
| Conversion factor | × 33.4009 | ||
Office / nonfacility rate, Delaware$64.68
Explore RVUs, geographic factors and the full formula
Office / nonfacility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 0.85 | 1.005 |
| Practice expense | 1.05 | 0.988 |
| Malpractice | 0.05 | 0.899 |
(0.85 × 1.005 + 1.05 × 0.988 + 0.05 × 0.899) × $33.4009 = $64.68
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.
77331 billing questions
How is this different from 77300?
Use 77300 for routine radiation dose calculations. Report 77331 when specialized measurement, such as TLD or microdosimetry, is performed rather than relying only on those calculations.
Which modifier identifies the interpretation?
Append modifier 26 for the professional interpretation. Modifier TC identifies the technical component, including equipment and staff; billing without either modifier represents the global service.
What documentation supports reporting 77331?
Document the specialized measurement method, why it was needed, and the measured results or interpretation. The record should make clear that the work was more than routine treatment-planning calculation.
Can 77331 be reported with a radiation dose plan?
It may accompany a dose-planning service when the specialized measurement is a distinct service actually performed. The record should distinguish the measurement from the plan's routine calculations.
Does this code describe a radiation treatment aid?
No. It describes specialized dose measurement; codes 77332–77334 describe radiation treatment aids, such as devices used to shape or support treatment delivery.
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.
9,06877321,,Special teletx port plan,A,,0.93,1.85,,1.85,NA,0.05,2.83,2.83,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,06977321,26,Special teletx port plan,A,,0.93,0.52,,0.52,,0.04,1.49,1.49,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,07077321,TC,Special teletx port plan,A,,0.00,1.33,,1.33,NA,0.01,1.34,1.34,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,07177331,,Special radiation dosimetry,A,,0.85,1.05,,1.05,NA,0.05,1.95,1.95,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,07277331,26,Special radiation dosimetry,A,,0.85,0.48,,0.48,,0.04,1.37,1.37,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,07377331,TC,Special radiation dosimetry,A,,0.00,0.57,,0.57,NA,0.01,0.58,0.58,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
9,07477332,,Radiation treatment aid(s),A,,0.44,0.75,,0.75,NA,0.03,1.22,1.22,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
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
4209102,FL,04,MIAMI,1.000,1.041,2.529
4309102,FL,99,REST OF FLORIDA,1.000,0.956,1.503