Intensity Modulated Radiation Therapy (IMRT) for Tumors of the Central Nervous System
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This policy governs coverage of IMRT for treatment of tumors of the central nervous system for Blue Cross Blue Shield of North Carolina members, specifying when IMRT is considered medically necessary or not covered.
Per Medical Director/CAP review: removed items 1-3 under 'When Covered' section; IMRT is considered medically necessary for the treatment of tumors of the central nervous system.
Under 'when not covered' section, added non-covered criteria: 'Intensity Modulated Radiation Therapy (IMRT) is considered not medically necessary for prophylactic cranial irradiation in individuals with small cell lung cancer (SCLC).'
References and specialty consultant reviews were updated through 5/2026, including NCCN CNS guidelines and final results of NRG Oncology CC001.
Billing/Coding section updated with CPT code changes effective 1/1/2026 (added 77407, 77412; deleted 77385, 77386, G6015, G6016).
Coverage Criteria for IMRT in CNS Tumors
General medical necessity for IMRT in CNS tumors
Covered when ALL of the following are met
Policy statement of coverage applies when medical criteria and guidelines are met.
Evidence includes dose-planning studies, case series, nonrandomized comparisons, and randomized data for hippocampal avoidance.
Medically Necessary Coverage
Covered when the following general statement applies:
This replaced prior itemized 'when covered' criteria per Medical Director/CAP review.
Prophylactic cranial irradiation in individuals with small cell lung cancer (SCLC): Intensity Modulated Radiation Therapy (IMRT) is considered not medically necessary for prophylactic cranial irradiation in individuals with SCLC and therefore is not covered in that clinical context.
IMRT for prophylactic cranial irradiation in SCLC is not covered: The policy explicitly states that Intensity Modulated Radiation Therapy (IMRT) is considered not medically necessary for prophylactic cranial irradiation in individuals with small cell lung cancer (SCLC), and providers should not expect coverage for IMRT when used for prophylactic cranial irradiation in SCLC patients.
Not medically necessary when criteria are not met: IMRT is considered not medically necessary and therefore not covered when the policy’s coverage criteria for treatment of tumors of the central nervous system are not met.
IMRT for prophylactic cranial irradiation in SCLC — explicit noncoverage: The policy implementation notes and the coverage section reaffirm that IMRT for prophylactic cranial irradiation in patients with small cell lung cancer (SCLC) is explicitly listed as not medically necessary and may be denied when billed for that indication.
Billing and Coding
| 77385 | CPT code previously listed (deleted effective 1/1/2026) |
| 77386 | CPT code previously listed (deleted effective 1/1/2026) |
| G6015 | HCPCS previously listed (deleted effective 1/1/2026) |
| G6016 | HCPCS previously listed (deleted effective 1/1/2026) |
| 77407 | CPT code added effective 1/1/2026 |
| 77412 | CPT code added effective 1/1/2026 |
| 77338 | CPT code referenced in policy guidelines (reporting frequency guidance noted in prior versions) |
| 77418 | CPT code deleted previously (per historical changelog) |
| 0073T | CPT code deleted previously (per historical changelog) |
Provider Actions, Documentation, and Authorization
Provide listed CPT codes and expect medical necessity review
Applicable CPT codes for IMRT of CNS tumors are listed in the policy and may be requested as part of a medical necessity review. Providers should expect prior authorization where applicable and be prepared to submit medical records to support the request.
Use updated CPT/HCPCS codes for authorizations and claims (effective 1/1/2026)
Effective 1/1/2026 the Billing/Coding section was updated—providers must use the current CPT codes in the policy when requesting authorization or submitting claims.
No step therapy required per policy excerpt
No step therapy requirements are specified in this policy excerpt; do not apply step-therapy constraints not documented in the policy.
Submit medical records and specific supporting documentation when requested
BCBSNC may request complete medical records to determine medical necessity. When records are requested, letters of support or explanation can be helpful but are not sufficient unless they include all specific information the payer requires.
- Be prepared to submit full medical records requested by BCBSNC for the determination of medical necessity
- Include specific clinical information requested rather than relying solely on supportive letters
Follow billing/coding and documentation expectations (including CPT 77338 reporting guidance)
Follow the policy’s billing/coding instructions when submitting claims and documentation. Note CPT 77338 is referenced in policy guidance and is limited per prior policy guidance; report units consistent with the policy and billing rules.
- Report and bill the applicable CPT codes listed in the policy (77301, 77338, 77407, 77412)
- CPT 77338 has previously been limited to 3 units per 60-day treatment course (policy guidance)
- Use the updated Billing/Coding section when preparing claims to ensure correct code selection and reporting frequency
Do not use IMRT for prophylactic cranial irradiation in SCLC — not medically necessary
IMRT is explicitly not medically necessary for prophylactic cranial irradiation in individuals with small cell lung cancer (SCLC); services rendered in that context may be denied as not covered.
- Do not request authorization or bill IMRT for prophylactic cranial irradiation in SCLC; the policy states this use is not medically necessary
- Expect denial/claim denial risk for IMRT provided for prophylactic cranial irradiation in SCLC
High denial risk for IMRT used for prophylactic cranial irradiation in SCLC
Requests for IMRT for prophylactic cranial irradiation in SCLC are at high risk for denial because the policy lists this indication as not medically necessary and not covered.
- Anticipate denial of authorization requests and claims for IMRT in the setting of prophylactic cranial irradiation for SCLC per the policy
- Consider alternative, covered treatment approaches consistent with clinical guidelines when applicable
Background
Radiation therapy is an integral component in the management of many benign and malignant brain tumors. For high‑grade primary tumors and brain metastases, surgery followed by adjuvant radiation and systemic therapy is commonly used. Advanced delivery techniques such as Intensity Modulated Radiation Therapy (IMRT) (including VMAT and image‑guided variations) provide greater conformality compared with conventional 3‑dimensional conformal radiation therapy and can reduce dose to adjacent critical structures (eg, optic apparatus, brainstem, hippocampi), which may decrease toxicity and support specific clinical approaches like hippocampal avoidance during whole brain radiotherapy.
Definitions
Revision History and Policy Changes
Specialty Matched Consultant Advisory Panel review noted; no changes to policy statements.
Policy Guidelines section updated; no change to policy statement.
Specialty Matched Consultant Advisory Panel review noted; no changes to policy statements.
Specialty Matched Consultant Advisory Panel review noted; regulatory status and references updated with no change to policy statement.
Specialty Matched Consultant Advisory Panel review noted; reference added with no change to policy statement.
Specialty Matched Consultant Advisory Panel review noted; related policies updated to include Radiation Therapy Services with no change to policy statement.
Specialty Matched Consultant Advisory Panel review noted; Policy Guidelines updated and references added with no change to policy statement.
Per Medical Director/CAP review: removed prior itemized 'When Covered' items 1–3 and consolidated to a general statement that IMRT is medically necessary for CNS tumors.
Added explicit non-coverage: IMRT is considered not medically necessary for prophylactic cranial irradiation in individuals with small cell lung cancer (SCLC); notification given for effective date 2025-09-10.
Policy effective date (document-level effective date) for the revised coverage criteria.
Billing/Coding section updated to add CPT 77407 and 77412 and delete 77385, 77386, G6015, G6016, effective 2026-01-01.
References updated; Specialty Matched Consultant Advisory Panel and Medical Director reviews completed (5/2026) and documented in the policy footer.
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