CurrentUnitedHealthcarePolicy 2025T0613J

Radiation Therapy: Fractionation, Image-Guidance, and Special Services

Policy defines medically necessary radiation therapy fractionation limits (by disease site), indications for image-guided radiation therapy (IGRT), coding clarifications and special service use for external beam radiation therapy (EBRT) and related procedures. Applies to delivery limits, IGRT indications/contraindications, and use of special dosimetry/physics/special procedure codes.

Policy Summary

PayerUnitedHealthcare

PolicyRadiation Therapy: Fractionation, Image-Guidance, and Special Services

Policy CodePolicy 2025T0613J

Change Typeclarified

Effective DateMay 1, 2025

Next Review Date

Key ActionProvide documentation showing one or more of: clinically significant DVH difference for DIBH vs free breathing, inability to tolerate immobilization during CT simulation, significant target motion on imaging, or requirement for smaller CTV margins than traditional 3D-CRT.

SourceLink

POLICY UPDATE CHANGES

Template Update — Created shared policy version to support application to Rocky Mountain Health Plans membership and archived previous policy version 2025T0613I.

3Site-specific fractionation rules shown (Bone, Breast, Lung)

1IGRT coverage policy (indications/contraindications)

5Key CPT/HCPCS groups highlighted

multiple

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Guideline and trial summaries included

1Document part (3 of 3)

Coverage Summary

scope_summary: Defines medically necessary radiation therapy fractionation limits by disease site (e.g., bone, breast, lung), indications and exclusions for image-guided radiation therapy (IGRT), coding clarifications, and use/coverage of special dosimetry, medical physics, and special treatment procedure services as applied to external beam radiation therapy (EBRT) and related procedures. coverage_stance: Mixed — site-specific fractionation and IGRT indications are explicitly delineated; some special services are covered only when the primary radiation procedure is proven medically necessary. subject: Radiation therapy fractionation, image-guidance, and special services. policy_number: 2025T0613J. effective_date: May 1, 2025. short_description: Policy covers EBRT modalities (3D-CRT, IMRT, PBRT) and specifies fractionation limits by site (e.g., bone metastases: up to 10 fractions for palliative EBRT, with re-irradiation exception; breast: APBI up to 5 fractions, up to 21 fractions standard or up to 33 fractions in specified circumstances; locally advanced NSCLC: up to 35 fractions), IGRT indications and noncoverage scenarios (medically necessary for IMRT, PBRT, prior-irradiated targets, implanted fiducials, specified disease-site circumstances; not necessary for superficial skin treatments or for bony alignment without fiducials), and rules for special dosimetry/physics/special procedures (e.g., CPT codes 77331, 77370, 77470, 77399 considered only when the primary radiation procedure is proven and medically necessary; frequency/reporting limits detailed).

Key thresholds

Hypofractionation fraction size240 cGy to 340 cGy per fraction

PSA salvage thresholdOffer salvage radiation when PSA ≤ 0.5 ng/mL; may offer when PSA < 0.2 ng/mL for high-risk patients

Prostate intrafraction motion margin2 mm (lower-limit margin to account for intrafraction prostate motion)

Medical-Necessity Criteria

Bone Metastases - Palliative EBRT

When providing palliative external beam radiation therapy (EBRT) for treatment of a bone metastasis:

ALL of the following

ALL of the following
- Delivery of up to 10 fractions of radiation therapy
  Medically necessary
- Re-irradiation exception
  - Delivery of greater than 10 fractions for the treatment of a site that has previously received radiation therapy
    Medically necessary when site previously irradiated

Breast Adenocarcinoma - EBRT fractionation

When providing EBRT for breast adenocarcinoma the following are medically necessary:

Coding

Applicable CPT/HCPCS codes referencedmixed

77261	Simple simulation
77262	Intermediate simulation
77263	Complex simulation
77301	IMRT planning
77306	3D treatment planning
77307	3D treatment planning, complex
77316	Brachytherapy source placement
77317	Brachytherapy afterloading
77318	Brachytherapy high dose
77331	Special dosimetry (e.g., TLD, microdosimetry)

1–10 of 58

1/6

Codes not to report with superficial radiation (77401)CPTNot Covered

77261
77262
77263
77332
77333
77334
77306
77307
77316
77317

1–10 of 29

1/3

Special dosimetry and special services considered only when primary procedure is proven and medically necessaryCPTCovered

77331	Special dosimetry - coverage only when primary radiation procedure is proven and medically necessary
77301	IMRT planning - coverage only when primary radiation procedure is proven and medically necessary
77370	Special medical radiation physics consultation - coverage only when primary radiation procedure is proven and medically necessary
77470	Special treatment procedure - coverage only when primary radiation procedure is proven and medically necessary
77399	Unlisted special services - coverage only when primary radiation procedure is proven and medically necessary

Provider Actions & Billing Guidance

Documentation Required

Documentation to justify IGRT with 3D-CRT for non-listed conditions

Documentation to justify use of IGRT with 3D-CRT for conditions not explicitly listed in the policy must include clinical rationale and supporting objective evidence. Provide a contemporaneous note describing why standard 3D-CRT without image guidance is insufficient and how IGRT will materially change setup or dosing to reduce normal tissue exposure or improve target coverage.

Comparison treatment plans and dose-volume histograms (DVHs) demonstrating clinically significant normal tissue sparing with IGRT (e.g., DIBH vs free-breathing comparison when cardiac or lung dose reduction is the goal).
Documentation of inability to tolerate immobilization during CT simulation (e.g., notes from simulation documenting patient movement, failed immobilization attempts).
Objective imaging evidence of significant target motion (simulation cine/4D-CT, prior imaging showing respiratory or organ motion).
Rationale showing that smaller clinical target volume (CTV) margins are required and quantification of margin reduction enabled by IGRT.
If implanted fiducials are used, documentation of placement and intent to use for localization.

Background, Evidence, and Definitions

Policy background and definitions: External beam radiation therapy (EBRT) includes three-dimensional conformal radiation therapy (3D-CRT), intensity-modulated radiation therapy (IMRT), and proton beam radiation therapy (PBRT) and is the common modality to deliver high-energy rays/particles from outside the body. Image-guided radiation therapy (IGRT) is the use of patient imaging to localize and reposition the patient or delivery system before treatment to ensure accurate beam targeting; IGRT is particularly applicable to highly conformal modalities and when targets are near critical structures or subject to motion. Hypofractionation is delivery of fewer, larger doses (>200 cGy) and is defined in this policy as fraction size between 240 cGy and 340 cGy. Special treatment procedures denote additional physician effort, technical resources, and complexity for procedures such as pediatric daily anesthesia, total/hemibody irradiation, combined EBRT and brachytherapy, and other complex circumstances; reporting of CPT 77470 should be limited and typically reported once when justified. Special medical physics consultation refers to situations requiring a written analysis by a qualified medical physicist for complex treatment planning problems; CPT 77370 is intended for such complex consultations and is reportable under specified circumstances. The policy references ASTRO 2024 guidance and multiple evidence summaries (AHRQ/ASTRO reviews, randomized trials, and guideline recommendations) to support site-specific fractionation, IGRT indications, and special services/coding clarifications; coding and billing rules (e.g., IGRT not reported separately with SBRT/SRS; IGRT imaging during brachytherapy should be reported with simulation code 77280; megavoltage delivery codes not reported with superficial radiation 77401) are provided per ASTRO recommendations.

Source	Key point
AHRQ/ASTRO review (Skelly et al. 2023)	Single fraction and multiple fraction EBRT likely have similar overall pain response; single fraction associated with higher re-irradiation
Randomized trials (Hartsell 2005; Chow)	8 Gy single fraction comparable for pain relief with higher retreatment rates vs multi-fraction regimens
Migliorini meta-analysis (2021)	8 Gy single fraction produced strong pain control and lower reirradiation in pooled analysis of skeletal metastases regimens
Breast trials (Brunt 2020; START; Whelan 2010)	Hypofractionated schedules (e.g., 26 Gy in 5 fx; 40 Gy in 15; 42.5 Gy in 16) are non-inferior with acceptable toxicity and fewer normal tissue effects
ASTRO PBI guidance (Shaitelman 2023)	Recommended external beam PBI regimens: 3000 cGy in 5 fractions and 4005 cGy in 15 fractions
NICE (2018/2024)	Recommends DIBH for left-sided breast and offers 26 Gy in 5 fractions and 40 Gy in 15 fractions in specified settings
RTOG/NRG lung trial (Bradley/RTOG0617 2015)	High-dose 74 Gy with concurrent chemo worse than 60 Gy; standard curative chemoradiation is 60 Gy in 2 Gy fractions
Prostate trials and reviews (Catton 2017; Dearnaley CHHiP 2016; HYPRO; Cochrane/Hickey 2019)	Moderate hypofractionation (e.g., 60 Gy/20 fx or 3 Gy×20) is noninferior to conventional dosing for many patients; very large fraction sizes (HYPRO 3.4 Gy) had mixed toxicity results
IGRT meta-analysis (Wang 2022)	IGRT reduced acute GU and GI toxicity and improved biochemical/tumor control; daily IGRT better than weekly
IGRT practice and outcomes studies (Kilburn 2016; Yao 2019; Lin 2012; Korreman 2012)	Evidence supports IGRT for margin reduction, improved local control in lung, reduced late toxicity in extremity sarcoma, and imaging schedule tailoring by site and BMI
ACR-ASTRO Practice Parameter and ASTRO guidance	IGRT increases accuracy, applicable to highly conformal modalities; recommends techniques, indications, and safety/QA processes
ASTRO coding/resource notes and policy coding clarifications	IGRT coding clarifications: not separately reportable with SBRT/SRS, and not for brachytherapy imaging; special services coding rules described
NCCN guidelines (various)	Strong recommendations for IGRT in multiple tumor sites when using RT/IMRT/SBRT to improve accuracy and reduce toxicity; daily prostate localization essential
ESTRO/ACROP and guideline summaries	Guidance for bone metastases fractionation (e.g., single 8 Gy or fractionated regimens) and recommendations for reirradiation contexts
ASTRO safety/white paper and QA guidance (Qi et al. 2023; Jaffray 2013)	IGRT is resource intensive and requires SOPs, interdisciplinary staffing, and comprehensive QA programs
Multiple ASTRO site-specific guideline recommendations	ASTRO recommends daily IGRT or motion management for liver, pancreas, oligometastatic NSCLC, soft tissue sarcoma, and other sites

Term	Definition
Definitive Treatment	Radiation treatments for cancer with a curative intent (Landsteiner et al., 2023).
Limited Metastatic Disease (prostate only)	Absence of visceral metastasis or less than four bone metastases with no metastasis outside vertebral bodies or pelvis (Parker et al., 2018).
Hypofractionated radiotherapy	Delivery of fewer and larger (>200 cGy) doses; defined here as EBRT with fraction size between 240 cGy and 340 cGy.
HF-WBI	Hypofractionated whole-breast irradiation
APBI / PBI	Accelerated/partial breast irradiation
IGRT	Image-guided radiotherapy
DIBH	Deep inspiration breath-hold
IGRT (expanded)	Image-Guided Radiation Therapy — use of imaging during radiation therapy delivery to improve accuracy of target localization and reduce treatment margins
PTV	Planning Target Volume

Revision History

2025-05-01clarifiedLatest

Summary of Changes dated 05/01/2025 notes template update and archival of prior version.

Policy Summary

PayerUnitedHealthcare

PolicyRadiation Therapy: Fractionation, Image-Guidance, and Special Services

Policy CodePolicy 2025T0613J

Change Typeclarified

Effective DateMay 1, 2025

Next Review Date

SourceLink

On This Page

ALL of the following

ALL of the following
- Delivery of up to 5 fractions for accelerated partial breast irradiation (APBI)
  Medically necessary
- Delivery of up to 21 fractions (inclusive of a boost to the tumor bed)
  Medically necessary
- ALL of the following
  - ANY of the following
    Treatment of supraclavicular and/or internal mammary lymph nodes
    Post-mastectomy radiation therapy
    Individual has received previous thoracic radiation therapy
    Individual has a connective tissue disorder such as lupus or scleroderma
- Delivery of greater than 33 fractions (inclusive of a boost to the tumor bed) is not medically necessary
  Not medically necessary

Locally Advanced Non-Small Cell Lung Cancer - EBRT

When providing EBRT, with or without chemotherapy, for locally advanced non-small cell lung cancer:

ALL of the following

Delivery of up to 35 fractions
Medically necessary
Delivery of greater than 35 fractions is not medically necessary
Not medically necessary

Image-Guided Radiation Therapy (IGRT) - Indications

Image guidance for radiation therapy is medically necessary under any of the following circumstances:

ANY of the following

When used with intensity modulated radiation therapy (IMRT) (e.g., prostate cancer)
When used with proton beam radiation therapy (PBRT)
When the target has received prior radiation therapy or abuts previously irradiated area
When implanted fiducial markers are being used for target localization
ALL of the following
- Breast cancer when any of: Accelerated partial breast irradiation; Breast boost with the use of photons; Hypofractionated radiation therapy delivered up to five fractions to the whole breast or chest wall; Individual is being treated in prone position; Left breast cancer and deep inspiration breath hold (DIBH) technique is being used
- During boost treatment of rectal and bladder cancer
- Esophageal cancer
- Gastric cancer
- Head and neck cancer
- Hepatobiliary cancer
- Lung cancer
- Pancreatic cancer
- Soft tissue sarcoma
ALL of the following
- Clinically significant difference in normal tissue sparing between DIBH and free breathing as documented by comparison plans and dose-volume histogram (DVH)
  (e.g., right-sided breast cancer)
- Member unable to tolerate immobilization during computed tomography (CT) simulation
- Significant target motion as documented by imaging
- Smaller clinical target volume (CTV) margins are required than what is traditionally used for 3D-CRT

Image-Guided Radiation Therapy (IGRT) - Not Medically Necessary

IGRT is not medically necessary when the above criteria are not met, including but not limited to:

ANY of the following

Superficial treatment of skin cancer including superficial radiation therapy or electronic brachytherapy
To align bony landmarks without implanted fiducials (e.g., during palliative radiation therapy)

Billing Rule

Do not report IGRT separately with SBRT or SRS

IGRT imaging codes should not be billed separately when IGRT is delivered as part of SBRT or SRS; image guidance is considered bundled into the SBRT/SRS service.

Billing Rule

Do not use IGRT codes for brachytherapy imaging

IGRT CPT codes are not appropriate for imaging performed as part of brachytherapy applicator verification. Use simple simulation/applicator verification coding instead.

Affected code: 77280

Billing Rule

Do not report megavoltage treatment delivery codes with superficial radiation

When superficial radiation therapy (CPT 77401) is provided, do not report megavoltage treatment delivery codes for the same course of treatment; those delivery codes are not applicable with superficial/ortho voltage therapy.

Reference CPT: 77401
Not-to-report list includes (non-exhaustive): 77261, 77262, 77263, 77332, 77333, 77334, 77306, 77307, 77316, 77317, 77318, 77336, 77370, 77371, 77372, 77373, 77402, 77407, 77412, 77417, 0394T, 0395T, 77427, 77431, 77432, 77435, 77469, 77470, 77499

Billing Rule

Limit use of special dosimetry and special services to when primary procedure is medically necessary

Special dosimetry and other special services (medical physics, special treatment procedures, unlisted physics services) should only be reported when the primary radiation procedure is medically necessary and when the additional service is specifically required to deliver the medically necessary therapy.

Affected codes: 77331, 77301, 77370, 77470, 77399
CPT codes above are considered for coverage only when the primary radiation procedure is proven and medically necessary.

Billing Rule

Special dosimetry frequency note

Special dosimetry (CPT 77331) should be reported only when clinically indicated. Typical frequency ranges from one to six measurements depending on the clinical situation; additional measurements require supporting documentation and will be evaluated case-by-case.

Reference CPT: 77331
Usual frequency: 1–6 measurements; any additional requests require justification

Billing Rule

Special medical physics and special treatment procedure reporting frequency

Special medical physics consultation (CPT 77370) and special treatment procedure (CPT 77470) are generally reportable once per course when the policy-described complex circumstances are present. Routine or repeated billing of these codes without documented extraordinary need is not supported.

Reference CPTs: 77370, 77470
Report once per course when complex/extraordinary circumstances apply; routine/repeated use requires documentation of distinct clinical necessity

Documentation Required

Use DIBH for left-sided breast cancer when appropriate

Use of deep inspiration breath-hold (DIBH) is recommended for left-sided breast cancer when clinically appropriate to reduce cardiac and lung dose; document use of DIBH in the simulation and treatment notes.

Documentation Required

Weekly imaging verification for APBI/WBI per NCCN

Perform weekly imaging verification for accelerated partial breast irradiation (APBI) and whole breast irradiation (WBI) per NCCN guidance; document verification imaging and any adjustments made.

Documentation Required

Daily prostate localization with IGRT

Daily prostate localization using IGRT is the expected standard for prostate radiotherapy; document daily localization method and any fiducial use or deviations.

Documentation Required

Consider pelvic node radiation and IMRT dosing in high-risk prostate cancer

For high-risk prostate cancer, consider inclusion of pelvic nodes and use IMRT dosing strategies as clinically indicated; document the rationale for nodal coverage and the planned dose/fractionation.

Documentation Required

Reference member-specific benefit plan

Always confirm coverage and benefit limits with the member-specific benefit plan; coding or medical necessity determinations do not guarantee member coverage.

Documentation Required

Check Medicare coverage guidance for MA plans

For Medicare Advantage (MA) members, verify Medicare coverage rules and any program-specific guidance prior to delivery; MA plans may follow Medicare/NCD/LCD determinations.

Documentation Required

Follow institutional QA and SOPs

Follow your institution's quality assurance (QA) programs and standard operating procedures (SOPs) for simulation, immobilization, image guidance, and treatment delivery; document adherence and any deviations in the medical record.

Documentation Required

DIBH use — documentation and reproducibility

When delivering deep inspiration breath-hold, image guidance and documentation should demonstrate reproducibility of breath-hold and dosimetric benefit when claimed; include breath-hold coaching and device use in the record.

Documentation Required

Weekly imaging verification — documentation practice

Maintain documentation of weekly imaging review and any corrective actions taken during APBI/WBI courses; link imaging verification to any subsequent plan adaptation.

Documentation Required

Daily prostate localization — documentation practice

Document daily prostate localization workflows including imaging modality, alignment targets (fiducials, soft-tissue), and any shifts applied; retain imaging records to support billing and medical necessity.

Documentation Required

Pelvic node IMRT dosing — documentation practice

When pelvic nodal irradiation is planned for high-risk disease, document patient selection criteria, target volumes, dose constraints, and why IMRT was selected to meet organ-at-risk constraints.

Documentation Required

Salvage radiation timing — documentation practice

For salvage radiation, document timing relative to prior therapies and the clinical indication for salvage intent versus palliative approaches.