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CPT code 77371: SRS delivery, multisource cobalt-602026 Medicare rate & RVUs

Reports technical delivery of a complete, one-session course of multisource cobalt-60 stereotactic radiosurgery for one or more cranial lesions.

CMS RVU26DEffective Oct 1, 2026109 payment localities103 Medicare services in 2024

Medicare rate · 77371

SRS delivery, multisource cobalt-60

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 77371 →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 77371 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 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

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

109 of 109 payment localities

77371 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

77371 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
77371 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 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

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 77371

The CMS indicators that decide how 77371 is paid alongside other services.

CMS payment indicators · 77371

SRS delivery, multisource cobalt-60

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.

77371 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • 77371

    SRS delivery, multisource cobalt-600 wRVU

    Not priced

  • 77372

    Stereotactic radiosurgery, linear accelerator, one session0 wRVU

    $933.89

  • 77373

    SBRT delivery, per fraction, up to five0 wRVU

    $978.65

  • 77432

    Stereotactic management, cranial, single-session course7.72 wRVU

    $424.19

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.

Codes related to 77371

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

Codes related to 77371
CodeHow it relatesNational office range
Used instead
77372Stereotactic radiosurgery, linear accelerator, one sessionCranial SRS delivered with a linear accelerator rather than a multisource cobalt-60 system.$799.80–$1,340.31
77373SBRT delivery, per fraction, up to fiveStereotactic body radiation therapy delivery rather than cranial SRS.$837.78–$1,403.64
Often billed with
77432Stereotactic management, cranial, single-session courseSeparately represents stereotactic radiation treatment management for cranial lesions when furnished.$393.73–$553.46

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.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates

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