CPT 77334Radiology

Radiation treatment aid(s)

CPT 77334 covers the creation of custom devices used to position and immobilize patients during radiation therapy, such as molds, casts, or blocks that help target radiation precisely while protecting healthy tissue.

Showing rates for

National Average

Base Medicare rate

$122.92

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

1.15

PE RVU (NF)

2.6

MP RVU

0.05

Total RVU

3.8

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

NCCI bundling edits

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Billing tips

Document the specific type and complexity of each treatment aid fabricated, including materials used (thermoplastic, foam, vacuum bag) and anatomic site, as simple vs. complex aids impact medical necessity justification
Impact: Reduces denial rate by 40-50% when specific fabrication details are documented; prevents downcoding or denials for lack of medical necessity
Bill 77334 only once per treatment course unless a new aid is required due to patient anatomy changes, aid malfunction, or treatment plan revision with documentation supporting medical necessity
Impact: Prevents automatic denials for duplicate services; when properly documented with modifier 76, allows additional $122.92 reimbursement for medically necessary refabrication
Verify that 77334 is billed before or concurrent with simulation services (77280-77295) but not after treatment has already begun, as aids must be ready for simulation and treatment planning
Impact: Ensures proper sequencing; billing after treatment start increases denial risk by 60% due to medical necessity and timing concerns
Use 77334 for custom-fabricated aids only; do not bill for standard commercial positioning devices or reusable equipment that are not patient-specific
Impact: Prevents upcoding audits and recoupment; improper use can trigger $122.92 refund per incident plus potential fraud investigation
When billing in the non-facility setting, ensure that all supplies and equipment costs are captured as the PE RVU (2.6) represents significant practice expense for materials and staff time
Impact: Maximizes legitimate reimbursement; proper cost tracking justifies the $122.92 payment and supports rate negotiations with commercial payers

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 77334 in 2025?

The 2025 Medicare national average reimbursement for CPT 77334 is $122.92 for both facility and non-facility settings. This rate is based on 3.8 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary based on geographic location and MAC-specific adjustments.

How many times can you bill CPT 77334 per radiation treatment course?

CPT 77334 is typically billed once per treatment course for the initial fabrication of treatment aids. Additional billing requires clear documentation of medical necessity, such as when a new aid is needed due to significant patient weight loss, tumor regression, treatment plan changes, or aid malfunction. Use modifier 76 for repeat services and document the specific clinical reason.

What is the difference between CPT 77334 and 77332 for radiation treatment aids?

CPT 77334 describes simple treatment aids (blocks, molds, immobilization devices), while 77332 describes more complex treatment devices including compensators and wedges requiring extensive design and fabrication. Code 77332 was deleted in recent CPT updates, and current practice uses 77334 for most treatment aids with documentation reflecting complexity.

Can CPT 77334 be billed with simulation codes on the same day?

Yes, CPT 77334 can be billed on the same day as simulation codes (77280-77295) as they represent distinct services. The treatment aid fabrication (77334) is separate from the simulation procedure itself. However, ensure documentation clearly distinguishes the two services and verify payer-specific bundling edits, as some commercial payers may have different policies.

What documentation is required to bill CPT 77334 and avoid denials?

Required documentation includes: physician order for the specific treatment aid, detailed description of the device type and materials used, anatomic site requiring immobilization, custom measurements or molding process, date of fabrication, physician verification of adequacy, and linkage to the treatment plan. Photos of the device and fitting notes strengthen medical necessity support.

Does CPT 77334 include the professional and technical components?

Yes, CPT 77334 is a global code including both professional (physician supervision and design) and technical (fabrication, materials, staff time) components. In non-facility settings, bill without modifiers for the full $122.92. In split billing arrangements, use modifier 26 for professional component only or TC for technical component only.

What are common examples of treatment aids billed under CPT 77334?

Common treatment aids include thermoplastic immobilization masks for head and neck cancer, custom body molds or alpha cradles for torso immobilization, breast boards for positioning breast cancer patients, vacuum-lock cushions for extremity immobilization, custom shielding blocks, tissue compensators, and bolus material customized to patient contours for dose modification.