CPT code 77336: Physics review, per week of therapy2026 Medicare rate & RVUs in California
Reports a medical physicist’s recurring review of radiation treatment records and delivery parameters during a course of therapy, counted by week.
Medicare pays $99.73–$130.81 for 77336 in the office in California, from Chico, CA to San Benito County, CA. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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On this page 9 sections
What 77336 covers
A medical physicist performs this recurring technical review during external-beam radiation therapy. The work can include checking treatment documentation, patient-specific parameters, dosimetry, and quality assurance for treatment delivery. It is distinct from creating the initial treatment plan and from the radiation oncologist’s treatment-management service.
Report the service by week of therapy, rather than by treatment fraction or each chart item reviewed. Documentation should support the week’s review and identify the treatment records or parameters assessed. CMS classifies 77336 as technical-component-only, with no physician-work RVU; a separate code covers interpretation. The technical review and any separately reported physician service must represent distinct documented work.
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 77336 pays more and less in California
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
29 payment localities
$99.73 to $130.81
29 of 29 payment localities
| Payment locality | Office | Facility |
|---|---|---|
| Bakersfield, CA | $99.90 | Unavailable |
| Chico, CA | $99.73 | Unavailable |
| El Centro, CA | $99.74 | Unavailable |
| Fresno, CA | $99.73 | Unavailable |
| Hanford, CA | $99.73 | Unavailable |
| Los Angeles, CA | $107.84 | Unavailable |
| Madera, CA | $99.73 | Unavailable |
| Marin County, CA | $127.76 | Unavailable |
| Merced, CA | $99.73 | Unavailable |
| Modesto, CA | $99.73 | Unavailable |
| Napa, CA | $119.61 | Unavailable |
| Oxnard, CA | $107.66 | Unavailable |
| Redding, CA | $99.73 | Unavailable |
| Rest of California | $99.73 | Unavailable |
| Riverside, CA | $100.47 | Unavailable |
| Sacramento, CA | $105.75 | Unavailable |
| Salinas, CA | $105.39 | Unavailable |
| San Benito County, CA | $130.81 | Unavailable |
| San Diego, CA | $108.73 | Unavailable |
| San Francisco, CA | $127.68 | Unavailable |
| San Luis Obispo, CA | $103.59 | Unavailable |
| Santa Clara County, CA | $130.49 | Unavailable |
| Santa Cruz, CA | $110.42 | Unavailable |
| Santa Maria, CA | $106.02 | Unavailable |
| Santa Rosa, CA | $111.59 | Unavailable |
| Stockton, CA | $99.73 | Unavailable |
| Vallejo, CA | $119.49 | Unavailable |
| Visalia, CA | $99.73 | Unavailable |
| Yuba City, CA | $99.73 | Unavailable |
How the 77336 rate is calculated
Each of 77336’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 · 77336
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense2.69
2.69 RVUs× 1.000 GPCI
Malpractice0.07
0.07 RVUs× 1.000 GPCI
Adjusted RVUs
2.7600
Conversion factor
$33.4009
Medicare rate
$92.19
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 77336
The CMS indicators that decide how 77336 is paid alongside other services.
CMS payment indicators · 77336
Physics review, per week of therapy
| 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. |
77336 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 77370Radiation physics consultUnusual treatment circumstances
- Use 77336 for recurring weekly physics review during therapy. Use 77370 for a separately requested, case-specific physics consultation.
- 77300Dosimetry calculationBasic, per calculation
- 77300 represents a dose calculation; 77336 represents the physicist’s recurring review of treatment records and parameters.
- 77427Radiation treatment managementPer five treatment fractions
- 77427 represents the radiation oncologist’s treatment-management service. It is distinct from 77336’s technical physics review.
77336 billing questions
Is 77336 reported per treatment fraction?
No. It is reported per week of therapy, based on the documented weekly physics review rather than the number of fractions delivered.
How does 77336 differ from 77370?
77336 represents recurring physics review during treatment. 77370 is for a separately requested, special medical physics consultation addressing a specific problem.
Can 77336 be billed with radiation treatment management?
Yes, the weekly physics review is a distinct technical service from the radiation oncologist’s treatment-management service, reported separately when each service is performed and documented.
Should modifier 26 be appended to 77336?
No. CMS identifies 77336 as technical-component-only; a separate code covers interpretation.
What documentation supports 77336?
Record the week of therapy reviewed and the treatment documentation, parameters, dosimetry, or delivery quality checks assessed by the medical physicist.
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
Show the CMS file lines behind this rate
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