CPT 77790Radiology

Radiation handling

CPT code 77790 covers the professional work of handling radioactive materials used in radiation therapy treatments. This includes the safe preparation, measurement, and handling of radiation sources before they are used to treat cancer patients.

Showing rates for

National Average

Base Medicare rate

$18.44

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)

0.55

MP RVU

0.02

Total RVU

0.57

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

NCCI bundling edits

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Billing tips

Bill 77790 only once per treatment session regardless of the number of radiation sources handled, unless sources are used for completely separate and distinct treatment sites or fractions
Impact: Prevents overbilling denials and recoupment; ensures compliant billing that maintains the $18.44 reimbursement per appropriate handling session
Document the specific radioactive materials handled, including isotope type, activity level, and handling protocols followed in the medical record to support medical necessity
Impact: Reduces audit risk and denial rate by 30-40% through clear documentation of the technical service performed
Do not bill 77790 for handling of external beam radiation therapy equipment or sources that do not require direct radioactive material manipulation
Impact: Avoids inappropriate billing that results in 100% denial; this code is specific to radioactive source handling, not general radiation therapy setup
Verify that radiation handling is not already included in the global payment for brachytherapy application codes (77750-77778) before billing separately
Impact: Prevents bundling denials and ensures proper coding; incorrect unbundling can result in claim rejection and delay of $18.44 payment
Link 77790 to appropriate radiation therapy diagnosis codes that support medical necessity for radioactive material use, typically malignant neoplasm codes
Impact: Improves first-pass claim acceptance rate by 25-35% through proper diagnosis linkage supporting the radiation handling service
When billing for multiple fractions requiring separate handling, ensure each service is performed on a different date of service or use appropriate modifiers for same-day distinct services

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Related actions

Common denials

Bundled with brachytherapy application or radiation treatment delivery codes as inclusive service

How to appeal: Submit appeal with documentation showing handling was a separate, distinct service from the application procedure, including time stamps, personnel involved, and specific handling protocols. Cite CPT guidelines that 77790 may be reported separately when handling represents distinct technical work beyond the application procedure itself. Include radiation safety logs demonstrating separate handling session.

Insufficient documentation of radioactive material handling or lack of medical necessity

How to appeal: Provide detailed physics or dosimetry records showing specific radioactive sources handled, activity measurements, calibration data, and safety protocols followed. Include radiation safety officer sign-off and treatment planning documentation demonstrating the necessity of radioactive material use for the patient's treatment plan. Reference institutional radiation safety protocols and regulatory compliance requirements.

Duplicate billing when billed multiple times on same date of service without appropriate modifiers

How to appeal: Submit corrected claim with modifier 76 or 59 as appropriate, along with documentation explaining why multiple handling procedures were medically necessary on the same day. Provide treatment records showing separate treatment fractions, different radiation sources, or distinct anatomical sites requiring separate handling protocols. Include timeline of services demonstrating non-overlapping handling sessions.

Denied as not separately billable with external beam radiation therapy codes

How to appeal: Clarify that 77790 was used for handling of radioactive sources (brachytherapy or radiopharmaceuticals), not external beam therapy. Submit documentation distinguishing the radioactive material handling from external beam treatment setup. Include specific isotope information and handling protocols that demonstrate work beyond routine external beam therapy technical components.

Frequently asked questions

What is CPT code 77790 used for?

CPT code 77790 is used to bill for the professional handling of radioactive materials used in radiation therapy treatments. This includes preparation, measurement, calibration, and safe handling of radioactive sources such as brachytherapy seeds or radiopharmaceuticals according to radiation safety protocols. The 2025 Medicare reimbursement is $18.44 per handling session.

How much does Medicare pay for CPT 77790 in 2025?

Medicare pays $18.44 for CPT code 77790 in 2025 under both facility and non-facility settings. The code has a total RVU of 0.57 (0 work RVU, 0.55 practice expense RVU, and 0.02 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

Can CPT 77790 be billed with brachytherapy codes?

CPT 77790 can be billed with brachytherapy codes only when the radiation handling represents a separate, distinct service not included in the brachytherapy application procedure. Documentation must clearly demonstrate that handling work was performed separately from the application and was not an integral component of codes 77750-77778. Many payers consider handling bundled into brachytherapy application, so verify payer-specific policies before billing separately.

Who can perform and bill for radiation handling services under CPT 77790?

CPT 77790 must be performed by or under the direct supervision of a qualified radiation oncologist or medical physicist with appropriate state licensure and radiation safety certification. Personnel must be authorized to handle radioactive materials under institutional radiation safety protocols and hold valid NRC or Agreement State licenses for radioactive material handling.

How many times can 77790 be billed per patient per day?

CPT 77790 should generally be billed once per treatment session or handling event. Multiple units on the same day require clear documentation of separate, distinct handling procedures for different radiation sources, treatment fractions, or anatomical sites, and typically require modifier 76 (repeat procedure by same provider) or 59 (distinct procedural service) to prevent denial as duplicate billing.

What documentation is required to bill CPT code 77790?

Documentation must include the type and activity level of radioactive material handled, date and time of handling, name and credentials of the qualified professional, radiation safety protocols followed, calibration or measurement data, link to the associated treatment procedure, and evidence that handling was separate from any inclusive brachytherapy application. Radiation safety logs and quality assurance records strengthen documentation for audit defense.

Is CPT 77790 bundled with radiation treatment delivery codes?

CPT 77790 is typically bundled with external beam radiation treatment delivery codes, as handling of external beam equipment is considered inclusive. However, it may be separately billable when handling radioactive sources for brachytherapy or radiopharmaceutical therapy that requires distinct manipulation of unsealed or sealed radioactive materials. Always check the National Correct Coding Initiative (NCCI) edits and payer-specific bundling policies before billing separately with radiation delivery codes.