CPT code 77307 – Complex teletherapy isodose plan

Key takeaways

CPT code 77307 reports a complex teletherapy isodose plan for external beam radiation, and it includes basic dosimetry calculations.

A plan is complex when it covers multiple treatment areas or uses tangential ports, wedges, blocking, rotational beam or special beam considerations.

Use 77306 for one or two unmodified ports aimed at a single area, and use 77316 to 77318 for brachytherapy isodose plans.

Only one teletherapy isodose plan is reported per course of therapy to a specific treatment area.

In 2026, the Medicare national global payment for 77307 is about $290 to $292, depending on the conversion factor that applies.

CPT code 77307: Official descriptor and definition

CPT code 77307 is the code for a complex teletherapy isodose plan. The official AMA descriptor is quoted below.

Teletherapy isodose plan; complex (multiple treatment areas, tangential ports, the use of wedges, blocking, rotational beam, or special beam considerations), includes basic dosimetry calculation(s).

Teletherapy is external beam radiation, delivered from a machine outside the body. The isodose plan maps how the prescribed dose spreads through the patient, shown as lines joining points of equal dose. The radiation oncologist reviews and approves the plan before treatment starts.

The American Medical Association (AMA) maintains the CPT code set. It places 77307 in the radiation oncology section, among the medical radiation physics, dosimetry, treatment device and special service codes (77300-77370).

• Service type: Global service with separate professional (modifier 26) and technical (modifier TC) components
• Code family: Teletherapy isodose plans, 77306 (simple) and 77307 (complex)
• Who performs it: The dosimetrist or medical physicist builds the plan, and the radiation oncologist approves it
• What it includes: Basic dosimetry calculations, so 77300 is not reported separately for the same plan
• What it excludes: Brachytherapy planning, 3D and IMRT planning, treatment devices, radiation delivery and treatment management

What makes a teletherapy isodose plan complex: 77307 vs 77306

The choice between 77306 and 77307 depends on the plan’s beam arrangement, not the diagnosis or the number of fractions. If any complexity factor from the 77307 descriptor is present, the plan is complex.

A pair of parallel-opposed fields to one area, with no wedges or blocks, is a simple plan. Add wedges, blocking or a second treatment area, and the same course needs 77307.

77307 vs brachytherapy isodose plans 77316, 77317 and 77318

CPT code 77307 is an external beam code, so it never describes a brachytherapy plan. Brachytherapy places radioactive sources inside or next to the tumor, and it has its own isodose plan codes based on source or channel count.

Both families share the word complex, which is how brachytherapy plans end up wrongly coded as 77307. Match the code to the modality first, then to the complexity level, as the decision path below shows.

Related radiation planning codes and how they interact with 77307

An external beam course usually generates several planning, physics and device CPT codes. Knowing which ones absorb 77307 keeps radiation oncology billing accurate.

For more on the two neighboring codes, see the guides to CPT code 77300 and CPT code 77295.

How often CPT code 77307 can be billed

CPT guidance allows only one teletherapy isodose plan per course of therapy to a specific treatment area. A course to a second, separate treatment area can support its own plan.

77307 is not a per-fraction code. A 25-fraction course to one area still carries a single isodose plan, whether it is simple or complex.

Payer policies differ on replanning during a course, such as after a large weight change or a boost to a new volume. Check the payer’s written policy before reporting a second plan, and document the clinical reason for the new plan.

Documentation requirements for CPT code 77307

The record has to show that the plan exists and that it meets the complex level. A clean claim for 77307 rests on these elements:

• Physician-approved isodose plan: the plan signed and dated by the radiation oncologist
• Isodose distribution: the dose display from the treatment planning system for the treated volume
• Complexity factors: the treatment areas, tangential ports, wedges, blocks or rotational beams that make the plan complex
• Treatment area and course: the site being treated, so the one-plan-per-area rule can be checked
• Radiation prescription: the treating physician’s dose and fractionation for the course
• Diagnosis: an ICD-10-CM code that supports the medical need for radiation therapy

Use the date the physician approves the plan as the date of service, and keep the signature date on the plan so the two match. A plan signed after treatment begins invites questions on review.

Medicare reimbursement and RVU values for CPT code 77307

Medicare pays 77307 under the Physician Fee Schedule, with a status indicator of A (active). The figures below come from the CMS 2026 national RVU file, October release.

For 2026, CMS uses two conversion factors. Clinicians who are qualifying APM participants (QPs) use $33.5675, and all others use $33.4009. National payment is the total RVU multiplied by the conversion factor.

The facility and non-facility totals are the same for 77307, because the professional and technical split carries the site difference. Local payment changes with each locality’s geographic adjustment. Check your locality in the CMS Physician Fee Schedule lookup tool.

For comparison, the 2026 global non-QP rate is $150.30 for 77306 and $462.94 for the complex brachytherapy plan, 77318.

Modifiers for CPT code 77307

Modifier choice for 77307 follows who owns the equipment and who employs the planning staff.

Where an NCCI edit allows a modifier, modifier 59 or XS can apply when the documentation shows a separate treatment area or plan. Never add one only to get past an edit.

NCCI edits and bundling rules for CPT code 77307

The Medicare NCCI practitioner procedure-to-procedure (PTP) edits, version 32.3 (effective October 1, 2026), list these active pairs for 77307. Check each quarter’s file on the CMS NCCI PTP edits page before you submit.

The file has no edit between 77307 and the brachytherapy plan codes 77316, 77317 or 77318. A patient treated with both external beam and brachytherapy can have both plans reported when each is documented.

Diagnosis codes and prior authorization for 77307

No single diagnosis is required for 77307, but the ICD-10-CM code must support the medical need for external beam radiation. Most claims carry a malignant neoplasm code, such as these:

Check the diagnosis against your Medicare Administrative Contractor’s local coverage policy for radiation therapy where one applies. Traditional Medicare has no prior authorization program for radiation therapy planning.

Many Medicare Advantage and commercial plans manage radiation therapy through a benefit manager that authorizes the whole course. Get that approval before simulation and planning begin. Sound medical billing compliance puts this check at scheduling.

Common 77307 denials and how to prevent them

Most 77307 denials trace back to code choice, bundling or missing records. Denial management works best when each denial is logged against its cause.

How claims management software supports CPT code 77307 billing

Radiation oncology billing teams often track planning codes in spreadsheets, then rekey them into a clearinghouse portal. That split makes it hard to see which 77307 claims were paid and which came back.

Pabau, our practice management and billing platform, keeps the patient record, charges and claims in one system. Its claims management software pulls data already on the patient record into a claim. In the US, it submits that claim through the Claim.MD clearinghouse and tracks its status.

Remittances post back to the same record, so your team can see where every 77307 line stands. Your coders still choose the code and the modifier, and Pabau keeps the submission and payment history together.

Track radiation oncology claims in one place

Pabau submits US claims through Claim.MD, tracks their status and posts remittances to the patient record, so your team sees where each 77307 claim stands.

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Conclusion

Coding 77307 correctly starts with one question: is this an external beam plan, and does it carry a complexity factor? If the answer is yes to both, 77307 fits.

Most of the money at risk sits in the bundling rules. Leave 77300 off the claim, never pair 77307 with 77301, and report one isodose plan per treatment area.

Get those decisions right in the plan document, and the claim follows. Book a demo to see how Pabau tracks radiation oncology claims from submission to payment.

Continue your research

Need a refresher on claim basics? Clean claim best practices covers the fields every radiation oncology claim needs to avoid front-end rejections.

Reporting physics work alongside the plan? CPT code 77300 explains when basic dosimetry is billable and when an isodose plan absorbs it.

Planning in 3D instead? CPT code 77295 covers the 3-dimensional radiotherapy plan and its dose-volume histograms.

Seeing the same denials every month? Denial management in healthcare walks through tracking, appealing and preventing recurring denials.

Want the wider billing picture? What is revenue cycle management shows how planning codes fit into the full claims workflow.

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