CPT code 77412 – Level 3 radiation treatment delivery

Key takeaways

CPT Code 77412 is Level 3 radiation treatment delivery, the most complex of the three external beam delivery codes in CPT 2026.

Any one of four criteria qualifies a session: multiple isocenters, active motion management, total skin electrons, or mixed electron and photon fields.

Beam energy in MeV no longer selects the code, and the old simple, intermediate and complex labels are gone.

CPT 77385, 77386, 77014 and 77401 were deleted on January 1, 2026, so they never belong on a claim alongside 77412.

Imaging guidance is bundled into 77412, so only the professional component of 77387 is reported separately.

Pabau’s claims management software tracks radiation oncology CPT codes, flags CCI conflicts, and routes claims through Claim.MD.

What is CPT Code 77412? Level 3 radiation treatment delivery

CPT Code 77412 is Level 3 radiation treatment delivery, the most complex of the three external beam delivery codes in CPT 2026. The code reports the delivery itself, once per treatment session.

The American Medical Association, which maintains the CPT code set, describes Level 3 through four delivery patterns. Any one of them qualifies a session for 77412.

• Multiple isocenters treated with photon therapy, whether 2D, 3D conformal or IMRT
• A single isocenter photon plan, 3D or IMRT, delivered with active motion management
• Total skin electrons
• Mixed electron and photon fields

Imaging guidance is included in the code when it is performed. Beam energy in MeV plays no part in the choice, and the old simple, intermediate and complex labels no longer exist.

All three delivery levels are reported once per treatment session. A practice picks the one level the session meets and never stacks two of them.

The three 2026 radiation treatment delivery levels

The 2026 delivery family runs 77402, 77407 and 77412, ranked by how complex the delivery is. All three include imaging guidance when it is performed.

Work up the ladder, not down. Level 2 begins where the plan uses volumetric imaging with organs at risk delineated. Level 3 begins only when one of the four criteria above is documented in the record. Running the checks in that order stops a session landing a level too high.

What changed for CPT Code 77412 in 2026

CPT Code 77412 kept its number on January 1, 2026 and received an entirely new descriptor. The code that once sat inside an energy-graded family now sits at the top of a complexity-graded one.

The energy bands had left CPT a decade earlier. The AMA deleted 77403, 77404, 77406, 77408, 77409, 77411, 77413, 77414, 77416 and 77418 back in 2015.

Medicare kept the old logic running anyway. CMS built HCPCS codes G6003 to G6015 to mirror the deleted descriptors, so freestanding centers billed by MeV until the end of 2025. That is why so much radiation billing guidance still reads in MeV.

The CY 2026 Physician Fee Schedule final rule closes that decade-long split between the CPT book and the Medicare claim. Four other changes land alongside it.

• IMRT delivery codes deleted: 77385 and 77386 are gone. IMRT delivery now falls into Level 1, 2 or 3 according to complexity.
• CT image guidance deleted: 77014 is gone. Guidance is reported with 77387, and only its professional component is separately payable.
• Superficial and orthovoltage moved: 77401 is deleted. Surface radiation therapy is now reported with the new codes 77436 to 77439.
• Radiation therapy G-codes deleted: G6001 through G6017 are gone, covering both the energy-based delivery codes and the guidance codes.
• Port images bundled: 77417 carries procedure status B for 2026. Its payment sits inside the delivery codes, so it is not separately reportable.

ACRO’s 2026 coding guidance works through five coding scenarios against the revised descriptors, which is the fastest way to pressure-test your own case mix.

2026 Medicare payment for CPT Code 77412

CPT Code 77412 is a technical-only code. It carries no physician work RVU, so the professional component modifiers do not apply to it at all.

Medicare pays freestanding centers under the Medicare Physician Fee Schedule. The 2026 conversion factor is $33.4009 for practitioners outside a qualifying alternative payment model, and $33.5675 for those inside one.

Those amounts are national and unadjusted, calculated at the $33.4009 conversion factor. Multiply the RVUs by your locality’s geographic practice cost index before you quote a figure. Check the Medicare Physician Fee Schedule Look-Up Tool every January as well.

Hospital outpatient departments are paid under OPPS instead, where 77412 maps to APC 5623. CMS has said the APC assignments for all three delivery levels get another look in the next rulemaking cycle.

Practices running Pabau, practice management software for clinical and aesthetic teams, can route 77412 claims electronically through Claim.MD, its US clearinghouse partner.

The integration submits CMS-1500 and 837P claims to thousands of US insurance payers. Remittance returns as ERA files, so billing teams reconcile each payment against the expected amount.

Modifiers that apply to CPT Code 77412

Modifier 26 and modifier TC do not belong on CPT Code 77412. The code has a PC/TC indicator of 3, which means Medicare recognizes a technical component only.

The physician’s own work reviewing image guidance is billed separately, on a 77387 line with modifier 26. Putting modifier 26 on the delivery line instead is a denial waiting to happen.

Modifier rules on repeat fractions vary between payers. Document the time of each fraction in the claim narrative, because most MAC policies ask for it when two sessions share a date.

Documentation requirements for billing CPT Code 77412

The 2026 descriptor moved the audit target. Beam energy in the treatment record no longer supports the code, because the level now turns on delivery complexity.

Four elements carry a Level 3 claim through review.

• Signed treatment order: a dated physician order naming the treatment site, total prescribed dose, fractionation scheme and treatment intent
• The isodose plan and isocenter count: where a second isocenter is used, the plan must show the positional shift made for that separate treatment volume
• Evidence of active motion management: the record must show that intrafraction motion data controlled beam delivery, through gating, tracking or breath hold
• Daily treatment record: the machine record for the fraction billed, showing monitor units, field arrangement and patient positioning

Pre-treatment imaging on its own does not reach Level 3. A cone beam CT taken to line the patient up is localization, and localization is bundled into every delivery level.

Medical necessity carries more weight here than it used to. ACRO puts the anticipated utilization of 77412 at 35% of all treatment delivery. A practice billing it on every patient will draw attention.

For practices working toward medical billing compliance, keep the isodose plan, the machine record and the physician order as one linked set. That is the most defensible position under audit, and it makes a clean first-pass claim far more likely.

Bundling and CCI rules for CPT Code 77412

The 2026 restructure folded several separately billed services into the delivery codes. Claims still carrying the old lines will reject, so it is worth walking the list.

Verify the current quarter’s NCCI table through the AAPC Codify CPT lookup before assuming a combination is still valid. In the first year after a restructure, payer edits move faster than usual, so a re-check each quarter keeps avoidable write-offs down.

Common billing errors and how to avoid them

Denials on CPT Code 77412 in 2026 cluster around the transition itself. Six patterns account for most of them.

• Choosing the level by beam energy: MeV has no role in the 2026 descriptors. The level comes from the delivery technique instead.
• Treating image guidance as motion management: pre-treatment localization is bundled into every level. Level 3 needs motion data that actively controls the beam during the fraction.
• Billing 77387 without modifier 26: the technical component is bundled and carries status B. A global 77387 line goes unpaid.
• Reporting deleted codes: 77385, 77386, 77014, 77401 and the G6001 to G6017 range were all deleted on January 1, 2026.
• Counting fields as isocenters: several beams around one isocenter is still a single isocenter. A second isocenter means the patient was shifted for a separate treatment volume.
• Appending 26 or TC to 77412: the delivery code is technical-only, so neither component modifier belongs on that line.

Each pattern above has a documentation fix that stops it recurring. Reading the denial codes on the remittance tells a billing team which fix to apply before anyone resubmits.

Related radiation oncology CPT codes for 2026

CPT Code 77412 rarely appears on a claim alone. These are the codes a radiation oncology billing workflow puts around it in 2026.

How Pabau supports radiation oncology billing

A radiation oncology claim set moves in parallel lines. The delivery level sits on one line, 77387 with modifier 26 on another, 77427 every five fractions, and 77336 weekly from the physicist.

Keeping those relationships straight across a full course takes a workflow that links documentation to claim generation. The first year after a restructure makes that link more valuable than usual.

Pabau’s tools for cleaner claims management let billing teams build CPT bundles for a treatment course. They flag CCI conflicts at the review stage, before submission, and track open claims by denial reason.

Claims route electronically through Claim.MD from inside Pabau, with CPT and ICD-10 catalogs that validate combinations before a claim leaves the practice. ERA files return automatically, so payments reconcile against the expected amounts without a separate clearinghouse login.

Bill the 2026 delivery levels without guesswork

Pabau’s claims management tools help radiation oncology practices report the right delivery level, keep the 77387 professional line attached, and submit clean claims through Claim.MD.

Book a demo

Conclusion

CPT Code 77412 changed meaning on January 1, 2026. It is now Level 3 radiation treatment delivery, chosen by delivery complexity rather than beam energy. Multiple isocenters, active motion management, total skin electrons or mixed electron and photon fields each qualify a session on their own.

Most denials this year will come from claims still written for the old framework. Check that 77385, 77386, 77014 and the G-codes have been cleared out of your code lists, and that 77387 goes out with modifier 26.

Pabau’s claims management tools help radiation oncology billing teams validate code combinations, catch CCI conflicts, and submit clean claims through Claim.MD. To see how the workflow handles a multi-code radiation oncology claim set, book a demo with the Pabau team.

Continue your research

Need to understand how clearinghouse submission works for CPT claims? Medical claims clearinghouse guide explains how claims move from practice to payer and where errors get caught.

Want to reduce denial rates on radiation oncology claims? Claim.MD clearinghouse overview covers how Pabau’s US clearinghouse partner validates claims before they reach Medicare.

Looking to benchmark your billing process against best practices? Best medical billing software for US practices covers the features that separate high-performing billing teams from those still chasing avoidable denials.

Frequently asked questions