CPT 77372Radiology

Srs linear based

CPT code 77372 covers stereotactic radiosurgery (SRS) treatment delivery using a linear accelerator, a highly precise radiation therapy technique that targets tumors or lesions with focused beams. This is the professional component for planning and supervising the actual radiation treatment session.

Showing rates for

National Average

Base Medicare rate

$904.08

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

PE RVU (NF)

27.74

MP RVU

0.21

Total RVU

27.95

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Verify that treatment planning codes (77295 for stereotactic treatment planning) were billed separately on the planning date, not bundled with 77372 on treatment delivery date
Impact: Prevents $1,200-$1,500 loss from unbilled planning services; planning and delivery are separately reportable on different dates
Bill 77372 for each treatment session/fraction delivered; for single-fraction SRS report once, for hypofractionated courses (3-5 fractions) report for each fraction delivered
Impact: Ensures capture of $904.08 per fraction; failing to bill each fraction in a hypofractionated course results in $2,712-$4,520 revenue loss
Do not bill 77372 with 77371 (Gamma Knife or particle beam SRS) as these are mutually exclusive delivery systems for the same date of service
Impact: Prevents automatic denial and 100% payment loss; use only the code matching the actual delivery technology used
Ensure image guidance codes (77387 for guidance for localization) are billed separately when IGRT is performed, as this is not included in 77372
Impact: Captures additional $50-$75 per session for image-guided patient positioning; represents 5-8% additional revenue per treatment
Document the specific anatomic target(s) treated and number of lesions in the treatment note, as Medicare may require this for medical necessity and multiple lesion billing
Impact: Prevents denials on audit; supports medical necessity and allows billing multiple units with modifier 59 when treating separate lesions (potentially $904+ additional revenue)
Verify that the facility has current ACR accreditation for stereotactic radiosurgery and that physicist QA documentation is complete before billing

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 77372 in 2025?

The 2025 Medicare national average reimbursement for CPT 77372 is $904.08 for both facility and non-facility settings. This rate is based on 27.95 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual reimbursement may vary based on geographic locality adjustments (GPCI).

How many times can you bill CPT 77372 for a stereotactic radiosurgery treatment course?

You can bill CPT 77372 once for each treatment session (fraction) delivered. For single-fraction SRS, bill once. For hypofractionated courses (typically 3-5 fractions), bill 77372 for each fraction delivered on separate dates. Medicare does not have a specific frequency limitation, but medical necessity must support the fractionation scheme.

What is the difference between CPT 77372 and 77371 for stereotactic radiosurgery?

CPT 77372 is for linear accelerator-based SRS delivery, while CPT 77371 is for Gamma Knife, particle beam, or other non-linear accelerator stereotactic radiosurgery systems. The codes are mutually exclusive and should be selected based on the actual treatment delivery technology used. Both have identical 2025 Medicare reimbursement of $904.08.

Does CPT 77372 include the treatment planning for stereotactic radiosurgery?

No, CPT 77372 only covers the actual treatment delivery session. Treatment planning must be billed separately using CPT 77295 (stereotactic body radiation therapy treatment planning). Planning is typically performed days before the treatment delivery and is separately reimbursed at approximately $1,200-$1,500.

Can you bill CPT 77372 with modifier 26 for professional component only?

While technically possible, it is rarely appropriate because 77372 has 0 work RVUs, meaning there is essentially no professional component value. The code is predominantly technical (27.74 PE RVUs). In split billing situations, modifier TC (technical component) is more commonly used by facilities, while physicians typically bill supervision codes or planning codes separately.

What documentation is required to bill CPT 77372 and avoid denials?

Required documentation includes: physician supervision notes, treatment delivery record with dose/date/time, patient positioning verification, image guidance confirmation, physicist QA approval, treatment timeout checklist, specific anatomic targets treated, monitor units delivered, and any deviations from plan. Missing any element increases audit risk and denial probability.

How do you bill for multiple brain metastases treated in one SRS session with CPT 77372?

For multiple lesions treated in a single treatment session, bill CPT 77372 once for the treatment delivery. The number of lesions is factored into the treatment planning code (77295) complexity, not the delivery code. However, if treating completely separate anatomic sites (e.g., brain and spine) on the same day, modifier 59 may be appropriate with documentation supporting distinct sessions.