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CPT 77436: Surface Radiation Therapy Planning and Simulation

CPT code 77436 represents treatment planning and simulation–aided field setting for surface radiation therapy (SRT), a form of external beam radiation that uses low–energy X rays to treat cancers and other conditions on or near the skin surface. Nationally, accurate planning and simulation for SRT support precise field placement, reduce normal tissue exposure, and enable appropriate treatment delivery for dermatologic and superficial oncologic indications.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context for when planning is performed, the typical sites of service, and the operational role of CPT code 77436 in the radiation oncology service line. The publication covers benchmarks and policy-relevant considerations affecting coverage and coding practice, including payer coverage patterns, documentation expectations, and where CPT code 77436 fits with related radiation therapy services. It also highlights practical implications for billing workflows and payer communications. Data not available in the input where specific payer policy details, modifiers, taxonomies, ICD-10 pairings, and related codes are required.

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Billing Code Overview

CPT code 77436 describes treatment planning and simulation–aided field setting for surface radiation therapy (SRT). This service involves planning the delivery of external beam radiation using low–energy X rays targeted to lesions on or near the skin surface. Planning typically includes determining the size, shape, and placement of radiation fields and may include imaging simulation to confirm accurate targeting.

Service Type: Radiation therapy planning and simulation for surface radiation therapy

Typical Site of Service: Radiation oncology clinic, hospital outpatient department, or freestanding radiation treatment center (procedures performed where external beam radiation equipment and simulation imaging are available)

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CPT 77436: Surface Radiation Therapy Planning and Simulation

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Billing Code Overview

Service Type: Radiation therapy planning and simulation for surface radiation therapy

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A typical patient is a 68-year-old with a superficial basal cell carcinoma on the nasal ala referred to radiation oncology after surgery was declined due to cosmesis and comorbidities. The outpatient workflow begins with a consultation by a radiation oncologist who reviews pathology, photographs the lesion, and determines that surface radiation therapy (SRT) is appropriate. On the simulation day the provider performs treatment planning and simulation–aided field setting (77436), which includes measuring the lesion, selecting applicator size, marking field borders, documenting set‑up photos, and optionally obtaining imaging or surface mapping to confirm beam geometry. The plan defines field size, depth, dose per fraction, total dose, and shielding or bolus needs. Following planning, treatment is delivered at subsequent visits using low‑energy X‑ray SRT applicators until the prescribed dose is completed. Typical site of service is an outpatient radiation oncology clinic or ambulatory procedure center equipped for superficial radiation therapy. Common patient considerations include prior surgeries, lesion location near sensitive structures (eyes, nose, ears), anticoagulation status, and mobility for positioning.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the day of a procedure	Use when a distinct E/M visit is performed the same day as `77436` for evaluation unrelated to routine preprocedural work
`26`	Professional component	Use if billing the professional portion separately from the technical component for planning services performed by the physician
`RT`	Right side	Use when the field setting/treatment applies to the right side of the body
`LT`	Left side	Use when the field setting/treatment applies to the left side of the body
`59`	Distinct procedural service	Use if a separate, unrelated procedure is performed the same day that is not usually bundled with `77436`
`52`	Reduced services	Use if the planning/simulation service was partially performed or abbreviated
`GA`	Waiver of liability statement on file, patient refusal of standard care	Use in payor programs that recognize `GA` when applicable to treatment consent exceptions
`Q5`	Clinical social worker rendering case management services under direction of a physician	Use only if relevant multidisciplinary services are billed in conjunction with treatment planning under payor rules
`XE`	Separate encounter	Use when the simulation/planning encounter is separate from other encounters on the same day
`XP`	Separate practitioner	Use when a different practitioner performs the planning/simulation that is separate from other services billed that day

Taxonomy Code	Specialty	Notes
`207RC0000X`	Radiation Oncology	Primary specialty performing simulation and treatment planning for `77436`.
`208600000X`	Dermatology	Dermatologists may refer and co-manage superficial skin cancers treated with SRT; some dermatologic surgeons coordinate planning.
`363A00000X`	Radiation Therapist	Allied health professionals performing technical simulation and setup under physician direction.
`208500000X`	General Surgery	Surgeons may refer patients unsuitable for or refusing excision to radiation oncology for SRT.
`207L00000X`	Medical Oncology	Medical oncologists may be involved in multidisciplinary care when systemic therapy is relevant.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C44.311`	Basal cell carcinoma of right ala of nose	Superficial basal cell carcinomas of the nose are common indications for SRT planned with `77436`.
`C44.312`	Basal cell carcinoma of left ala of nose	Same as above for the left side; laterality guides RT field setting and modifier use.
`C44.219`	Squamous cell carcinoma of skin of trunk, unspecified	Superficial squamous cell cancers on the trunk may be treated with SRT when appropriate.
`C44.91`	Malignant neoplasm of unspecified skin, site unspecified	Represents cutaneous malignancies where SRT may be considered for superficial lesions.
`D22.9`	Melanocytic nevi, unspecified	Benign pigmented lesions are generally not treated with SRT but may appear in differential diagnosis during planning and localization.
`L57.0`	Actinic keratosis	Pre‑malignant superficial lesions sometimes treated with field therapies; included for clinical relevance during lesion assessment.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`77418`	Radiation treatment delivery, superficial and/or orthovoltage, per fraction	Delivers the prescribed superficial radiation fractions after planning and field setup performed with `77436`.
`77295`	Therapeutic radiology simulation-aided field setting, complex	Used for more complex simulation and field setting when three‑dimensional planning or more extensive immobilization/imaging is required compared with `77436`.
`77261`	Therapeutic radiology simulation-aided field setting, simple	Used for straightforward simulation that may be less involved than the planning described in `77436` depending on payer definitions.
`77300`	Ionizing radiation treatment delivery, simple; orthovoltage or superficial, per treatment session (technical component)	Technical delivery code that may be billed by the facility or technical provider for each treatment session following physician planning under `77436`.
`77336`	Continuing medical physics consultation, per week, when billed	Medical physics services that may support planning accuracy, dosimetry checks, or verification associated with SRT planning and delivery.

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

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Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the day of a procedure	Use when a distinct E/M visit is performed the same day as `77436` for evaluation unrelated to routine preprocedural work
`26`	Professional component	Use if billing the professional portion separately from the technical component for planning services performed by the physician
`RT`	Right side	Use when the field setting/treatment applies to the right side of the body
`LT`	Left side	Use when the field setting/treatment applies to the left side of the body
`59`	Distinct procedural service	Use if a separate, unrelated procedure is performed the same day that is not usually bundled with `77436`
`52`	Reduced services	Use if the planning/simulation service was partially performed or abbreviated
`GA`	Waiver of liability statement on file, patient refusal of standard care	Use in payor programs that recognize `GA` when applicable to treatment consent exceptions
`Q5`	Clinical social worker rendering case management services under direction of a physician	Use only if relevant multidisciplinary services are billed in conjunction with treatment planning under payor rules
`XE`	Separate encounter	Use when the simulation/planning encounter is separate from other encounters on the same day
`XP`	Separate practitioner	Use when a different practitioner performs the planning/simulation that is separate from other services billed that day

Taxonomy Code	Specialty	Notes
`207RC0000X`	Radiation Oncology	Primary specialty performing simulation and treatment planning for `77436`.
`208600000X`	Dermatology	Dermatologists may refer and co-manage superficial skin cancers treated with SRT; some dermatologic surgeons coordinate planning.
`363A00000X`	Radiation Therapist	Allied health professionals performing technical simulation and setup under physician direction.
`208500000X`	General Surgery	Surgeons may refer patients unsuitable for or refusing excision to radiation oncology for SRT.
`207L00000X`	Medical Oncology	Medical oncologists may be involved in multidisciplinary care when systemic therapy is relevant.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C44.311`	Basal cell carcinoma of right ala of nose	Superficial basal cell carcinomas of the nose are common indications for SRT planned with `77436`.
`C44.312`	Basal cell carcinoma of left ala of nose	Same as above for the left side; laterality guides RT field setting and modifier use.
`C44.219`	Squamous cell carcinoma of skin of trunk, unspecified	Superficial squamous cell cancers on the trunk may be treated with SRT when appropriate.
`C44.91`	Malignant neoplasm of unspecified skin, site unspecified	Represents cutaneous malignancies where SRT may be considered for superficial lesions.
`D22.9`	Melanocytic nevi, unspecified	Benign pigmented lesions are generally not treated with SRT but may appear in differential diagnosis during planning and localization.
`L57.0`	Actinic keratosis	Pre‑malignant superficial lesions sometimes treated with field therapies; included for clinical relevance during lesion assessment.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`77418`	Radiation treatment delivery, superficial and/or orthovoltage, per fraction	Delivers the prescribed superficial radiation fractions after planning and field setup performed with `77436`.
`77295`	Therapeutic radiology simulation-aided field setting, complex	Used for more complex simulation and field setting when three‑dimensional planning or more extensive immobilization/imaging is required compared with `77436`.
`77261`	Therapeutic radiology simulation-aided field setting, simple	Used for straightforward simulation that may be less involved than the planning described in `77436` depending on payer definitions.
`77300`	Ionizing radiation treatment delivery, simple; orthovoltage or superficial, per treatment session (technical component)	Technical delivery code that may be billed by the facility or technical provider for each treatment session following physician planning under `77436`.
`77336`	Continuing medical physics consultation, per week, when billed	Medical physics services that may support planning accuracy, dosimetry checks, or verification associated with SRT planning and delivery.

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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CPT 77436: Surface Radiation Therapy Planning and Simulation

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Billing Code Overview

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CPT 77436: Surface Radiation Therapy Planning and Simulation

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

References

CPT 77436: Surface Radiation Therapy Planning and Simulation

Sign up for cpt 77436 policy alerts

Billing Code Overview

CPT 77436: Surface Radiation Therapy Planning and Simulation

Sign up for cpt 77436 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

What does CPT 77436 cover and where is it typically performed?

Which modifiers are commonly used with 77436 and when should they be applied?

What CPT codes are commonly billed alongside or related to 77436?

Which diagnoses or clinical scenarios are appropriate pairings for billing 77436?

Who performs 77436 and in what clinical settings is it usually delivered?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

What does CPT 77436 cover and where is it typically performed?

Which modifiers are commonly used with 77436 and when should they be applied?

What CPT codes are commonly billed alongside or related to 77436?

Which diagnoses or clinical scenarios are appropriate pairings for billing 77436?

Who performs 77436 and in what clinical settings is it usually delivered?

References