CPT 79101Radiology

Nuclear rx iv admin

CPT 79101 covers the intravenous administration of radioactive materials (radiopharmaceuticals) for therapeutic treatment of diseases like thyroid conditions or certain cancers. This is the actual delivery of nuclear medicine therapy into the patient's bloodstream, not the imaging or diagnostic procedures.

Showing rates for

National Average

Base Medicare rate

$141.03

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

1.96

PE RVU (NF)

2.32

MP RVU

0.08

Total RVU

4.36

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

NCCI bundling edits

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Billing tips

Bill the radiopharmaceutical supply separately using appropriate HCPCS codes (A9xxx series) or CPT 79900 series codes; 79101 covers only the administration service
Impact: Failing to bill the radiopharmaceutical separately can result in loss of $1,000-$50,000+ depending on the specific isotope used (e.g., Lu-177 DOTATATE is extremely expensive)
Document exact time of administration, dose calibration verification, radiation safety protocols followed, and patient consent for therapeutic nuclear medicine
Impact: Comprehensive documentation reduces audit risk and supports the full $141.03 reimbursement; missing radiation safety documentation is a top audit trigger
Verify that the ordering physician has documented medical necessity for IV route specifically; some payers require justification why oral route (79005) is not appropriate
Impact: Prevents denials for lack of medical necessity; oral radioiodine (79005) reimburses at $56.03, so ensuring IV route is justified protects the additional $85.00 in revenue
Do not bundle with same-day diagnostic nuclear medicine studies without modifier 59 if both diagnostic and therapeutic administrations occur
Impact: Using modifier 59 appropriately can prevent loss of the $141.03 payment due to bundling edits with diagnostic imaging codes
Ensure NRC or state radioactive materials license number is on file and current; some Medicare contractors audit nuclear medicine codes for licensure compliance
Impact: Expired licenses can trigger recoupment of all nuclear medicine payments, potentially thousands of dollars per provider annually
Bill on the date of administration, not the date of dose preparation or prescription; timing must match documented infusion start time

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 79101 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 79101 is $141.03 for both facility and non-facility settings. This rate is based on 4.36 total RVUs multiplied by the 2025 conversion factor of 32.3465.

Does CPT 79101 include the cost of the radiopharmaceutical?

No, CPT 79101 covers only the professional service of administering the radiopharmaceutical intravenously. The radiopharmaceutical itself must be billed separately using appropriate HCPCS codes (A9xxx series) or supply codes from the CPT 79900 series.

What is the difference between CPT 79101 and 79005?

CPT 79101 is for intravenous administration of therapeutic radiopharmaceuticals, while 79005 is for oral administration. The route of administration determines which code to use, with IV administration (79101) reimbursing at $141.03 compared to oral administration (79005) which has a lower rate.

Can CPT 79101 be billed with diagnostic nuclear medicine scans on the same day?

Yes, but modifier 59 may be required to indicate that the therapeutic administration is a distinct service from any diagnostic imaging performed the same day. Documentation must clearly show separate clinical purposes and distinguish the therapeutic administration from diagnostic procedures.

Who can perform and bill for CPT 79101?

CPT 79101 must be performed by or under the direct supervision of a physician authorized to handle radioactive materials per NRC or state regulations. Typically billed by nuclear medicine physicians, radiation oncologists, or other specialists with appropriate radioactive materials licensure and institutional privileges.

What documentation is required to bill CPT 79101?

Required documentation includes physician prescription, dose calibration verification, patient identification and consent, IV access documentation, time-out procedure records, administration times, radiation safety protocols followed, and post-administration patient instructions. Missing radiation safety documentation is a common audit trigger.

How many RVUs is CPT code 79101 worth in 2025?

CPT 79101 has 4.36 total RVUs in 2025, composed of 1.96 work RVUs, 2.32 practice expense RVUs, and 0.08 malpractice RVUs. The work RVU reflects the physician effort involved in safely administering therapeutic radioactive materials.