CPT 77300Radiology

Radiation therapy dose plan

CPT code 77300 covers the basic planning work a radiation oncologist does to calculate the exact radiation dose a cancer patient needs. This is the foundational treatment plan before any radiation is delivered.

Showing rates for

National Average

Base Medicare rate

$65.34

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

0.62

PE RVU (NF)

1.36

MP RVU

0.04

Total RVU

2.02

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

NCCI bundling edits

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Billing tips

Bill 77300 only once per treatment course regardless of number of fractions planned. This is a one-time planning service per treatment area.
Impact: Prevents automatic denials for duplicate billing which account for 40% of 77300 rejections
Document the specific treatment volume, beam parameters, and dose calculations in the radiation oncology treatment plan before billing
Impact: Complete documentation reduces audit risk and supports the full $65.34 reimbursement versus downcoding to lower-level E/M services
Do not bill 77300 with higher-level planning codes 77301, 77306, 77307, or 77321 for the same treatment area during the same planning session
Impact: Unbundling violations trigger 100% claim denials and potential fraud investigations; use only the highest-level planning code applicable
Verify that the treatment area qualifies as 'simple' before using 77300; complex anatomy or multiple critical structures require higher-level planning codes
Impact: Upcoding to 77300 when 77262-77263 consultation codes are appropriate results in denials; correct initial coding prevents $40-90 in lost revenue from resubmissions
When re-planning is medically necessary during treatment, append modifier 76 and document anatomic changes, tumor response, or clinical reasons requiring new calculations
Impact: Properly documented re-planning with modifier 76 secures additional $65.34 payment that would otherwise be denied as duplicate
Submit 77300 with appropriate ICD-10 codes specifying the exact cancer site and treatment intent (curative vs palliative)
Specific diagnosis coding reduces Medical Director review delays by 60% and supports medical necessity for planning services

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 77300 in 2025?

The 2025 Medicare national average reimbursement for CPT 77300 is $65.34 for both facility and non-facility settings. This rate is based on 2.02 total RVUs multiplied by the 2025 conversion factor of 32.3465.

How many times can CPT 77300 be billed per patient?

CPT 77300 should be billed only once per treatment course for each distinct treatment area. If re-planning becomes medically necessary due to tumor changes or anatomic alterations during treatment, it may be billed again with modifier 76 and appropriate documentation of medical necessity.

What is the difference between CPT 77300 and 77301?

CPT 77300 is basic dose planning using simple techniques for straightforward cases, while 77301 represents teletherapy isodose planning for simple or complex treatment areas. 77301 involves more sophisticated isodose distribution calculations and typically reimburses at a higher rate. These codes should not be billed together for the same treatment area.

Can CPT 77300 be billed with simulation codes on the same day?

Yes, CPT 77300 can be billed with simulation codes (77280, 77285, 77295) on the same day as they represent distinct services. Simulation involves patient positioning and imaging, while 77300 represents the subsequent dose calculation and treatment planning based on simulation data.

What documentation is required to bill CPT 77300?

Required documentation includes the treatment plan with treatment site identification, beam parameters (energy, type, direction), dose calculations, treatment volume delineation, total prescribed dose, fractionation schedule, and radiation oncologist signature. The plan must reference the simulation or imaging used for planning.

What are the work RVUs for CPT code 77300?

CPT 77300 has 0.62 work RVUs, 1.36 practice expense RVUs (both facility and non-facility), and 0.04 malpractice RVUs, totaling 2.02 RVUs in 2025 according to the CMS Medicare Physician Fee Schedule.

When should I use a higher-level planning code instead of 77300?

Use higher-level codes when planning involves complex anatomy, multiple critical structures, 3D treatment planning (77295, 77306, 77307), intensity modulation (77301), or stereotactic planning (77370-77372). 77300 is appropriate only for simple, straightforward cases with basic dose calculations and single treatment volumes without complex dosimetry requirements.