CPT 77373Radiology

Strtctc bdy rad ther tx dlvr

CPT code 77373 covers the technical delivery of stereotactic body radiation therapy (SBRT), a highly precise form of radiation treatment that targets tumors with very focused, high-dose beams while minimizing damage to surrounding healthy tissue.

Showing rates for

National Average

Base Medicare rate

$949.37

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)

29.08

MP RVU

0.27

Total RVU

29.35

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

NCCI bundling edits

Loading bundling edits…

Billing tips

Bill 77373 only once per treatment session regardless of number of beams, arcs, or isocenters used during that fraction
Impact: Prevents automatic denials for duplicate billing; protects $949.37 per fraction payment
Ensure treatment planning codes (77295 for 3D planning or 77301 for IMRT planning) are billed separately during simulation phase, not on treatment delivery dates
Impact: Avoids unbundling denials and ensures proper payment for planning services (typically $300-800 additional)
Document respiratory gating, motion management, and image guidance systems used for each fraction to support medical necessity
Impact: Reduces audit risk and supports the high RVU value of 29.35 compared to conventional radiation delivery codes
Verify patient has received no more than the prescribed number of fractions in the SBRT course to prevent payment denials for exceeding treatment plan
Impact: Prevents recoupment of $949.37 per excess fraction during post-payment audits
Bill image guidance codes (77387 for guidance for localization) separately on same date as 77373 as they are not bundled
Impact: Captures additional $75-150 per fraction for required image guidance procedures
Confirm prior authorization requirements are met before initiating SBRT treatment course, as most payers require pre-approval for stereotactic delivery
Impact: Prevents denial of entire treatment course worth $949.37-4,746.85 depending on fractionation schedule

Live Field Datano reports yet

Real billers contribute denial patterns and appeal strategies for this code. Once 5+ reports come in, you’ll see live aggregated data here — the only place this exists, free.

Working with CPT 77373?

Get the free Revenue Protection Toolkit — the denial triggers, modifier pitfalls, and bundling conflicts that quietly cost you reimbursement. Instant download.

Help build the field knowledge

MedPayIQ gets smarter as billers contribute. If you've had this code denied, share what happened so others learn from it. Anonymous, no patient info.

Related actions

Frequently asked questions

What is the Medicare reimbursement rate for CPT 77373 in 2025?

The 2025 Medicare national average reimbursement for CPT 77373 is $949.37 for both facility and non-facility settings, based on 29.35 total RVUs and a conversion factor of 32.3465.

How many times can CPT 77373 be billed during an SBRT treatment course?

CPT 77373 is billed once per treatment fraction delivered. A typical SBRT course consists of 1-5 fractions depending on tumor site and size, so you would bill 77373 one time for each day the patient receives stereotactic radiation treatment delivery.

What is the difference between CPT 77373 and 77372?

CPT 77373 is for stereotactic body radiation therapy (SBRT) delivery to extracranial sites, while 77372 is for stereotactic radiosurgery (SRS) delivery to cranial (brain) lesions. The anatomic location determines which code to use, not the technique complexity.

Can CPT 77373 be billed with modifier TC for the technical component?

Yes, modifier TC can be appended when billing only the technical component in split-billing scenarios. However, since the work RVU for 77373 is 0.00, virtually all reimbursement ($949.37) represents the technical component, with minimal professional component value.

Does CPT 77373 include image guidance or is that billed separately?

Image guidance is billed separately using CPT 77387. While SBRT requires image guidance for precise targeting, it is not bundled into 77373 and should be reported as an additional line item on the same date of service.

What documentation is required to support billing CPT 77373?

Required documentation includes the radiation oncologist's SBRT prescription, daily treatment verification images, motion management records, physicist QA verification, treatment delivery parameters, immobilization device documentation, and image guidance records demonstrating stereotactic precision.

How do RVUs for CPT 77373 compare to conventional radiation therapy delivery?

CPT 77373 has 29.35 total RVUs, which is significantly higher than conventional IMRT delivery (77385 with 4.83 RVUs) or simple radiation treatment delivery (77402 with 1.82 RVUs), reflecting the specialized equipment, precision, and quality assurance required for stereotactic delivery.