CPT code 77371: SRS delivery, multisource cobalt-602026 Medicare rate & RVUs in Missouri
Reports technical delivery of a complete, one-session course of multisource cobalt-60 stereotactic radiosurgery for one or more cranial lesions.
CMS doesn’t publish an office rate for 77371 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.
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What 77371 covers
Code 77371 reports technical delivery of a complete course of stereotactic radiosurgery using a multisource cobalt-60 system for one or more cranial lesions. Radiation oncology teams use this approach for selected intracranial targets, such as brain tumors or arteriovenous malformations, after stereotactic planning and patient positioning. Focused beams treat the target without an incision. This differs from linear-accelerator SRS and stereotactic body radiation therapy.
Medicare lists 77371 as status C on the Physician Fee Schedule: CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim. The code covers technical treatment delivery; a separate code covers interpretation. Report the complete treatment course, not separate units for individual beams or targets. Code 77432 represents stereotactic radiation treatment management for cranial lesions when that service is furnished.
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 77371 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 77371 rate is calculated
Each of 77371’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 · 77371
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 77371
The CMS indicators that decide how 77371 is paid alongside other services.
CMS payment indicators · 77371
SRS delivery, multisource cobalt-60
| 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. |
77371 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 77372Stereotactic radiosurgeryLinear accelerator, one session
- Both describe cranial SRS delivery. Choose 77371 for a multisource cobalt-60 system and 77372 for a linear-accelerator system.
- 77373SBRT deliveryPer fraction, up to five
- 77371 is multisource cobalt-60 SRS for cranial lesions; 77373 is stereotactic body radiation therapy treatment delivery.
- 77432Stereotactic managementCranial, single-session course
- 77432 represents stereotactic radiation treatment management for cranial lesions. Code 77371 represents technical delivery of multisource cobalt-60 SRS.
77371 billing questions
When should 77371 be chosen instead of 77372?
Use 77371 for multisource cobalt-60 stereotactic radiosurgery. Code 77372 is for cranial SRS delivered with a linear accelerator.
How many units are reported for multiple targets or beams?
The code represents the complete course delivered in one session. Do not count individual beams or targets as separate units.
Does 77371 include the physician's interpretation?
No. It represents technical treatment delivery; a separate code covers interpretation. Code 77432 represents stereotactic treatment management for cranial lesions when that service is furnished.
Is 77371 the code for stereotactic treatment outside the cranium?
No. It describes multisource cobalt-60 SRS for cranial lesions. Code 77373 describes stereotactic body radiation therapy treatment delivery.
How does Medicare price 77371?
Its Physician Fee Schedule status is C. CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim.
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.
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