CPT code 77301: IMRT planning, dose optimization and volume analysis2026 Medicare rate & RVUs

Medicare pays $1,960.30 for 77301 nationally in the office. Local office rates run $1,712.54–$2,719.18.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 77301 covers

This service covers development of a computerized intensity-modulated radiation therapy plan. The team shapes and optimizes radiation fields to deliver the prescribed dose to the target while assessing exposure to organs at risk, often using dose-volume analysis. A radiation oncologist directs and approves the plan, with work commonly performed by medical physicists and dosimetrists in a radiation oncology department or freestanding center. It is planning work, not delivery of the radiation treatment.

Report the code when the record supports an IMRT-specific optimized plan, including the target and critical-structure evaluation, rather than a conventional teletherapy isodose plan. Documentation should identify the treatment plan, prescription, dose evaluation, and physician approval. CMS recognizes professional and technical components: modifier 26 identifies the professional interpretation, modifier TC the equipment and staff, and no modifier represents the global service.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where 77301 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

77301 rates by state

Office rate range in each state. Select a state to see its payment localities.

How the 77301 rate is calculated

Each of 77301’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 77301

The CMS indicators that decide how 77301 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

77301 compared with similar codes

How to choose

77306Radiation planSimple teletherapy plan

This code describes a simple conventional teletherapy isodose plan. Choose 77301 when the service is IMRT-specific optimized planning with dose-volume evaluation.

77307Isodose planningComplex teletherapy plan

This code describes a complex conventional teletherapy isodose plan. It is not the IMRT planning code, even when the conventional plan is technically complex.

77300Dosimetry calculationBasic, per calculation

77300 is for a radiation dose calculation, not the comprehensive IMRT plan and dose-volume evaluation reported with 77301.

77338MLC designPer IMRT plan

77338 reports design of an IMRT multileaf collimator device; 77301 reports the treatment plan itself.

Codes related to 77301

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates