Summary & Overview
CPT 61798: Stereotactic Radiosurgery for Single Complex Cranial Lesion
CPT code 61798 denotes stereotactic radiosurgery using externally generated ionizing radiation to ablate a single, complex intracranial lesion—typically larger than 3.5 cm. The code captures a high-complexity, high-resource procedure used in neurosurgery and radiation oncology for patients with solitary large brain lesions where focal destruction is clinically indicated. Nationally, this code matters because it represents care delivered in specialized centers, with implications for facility readiness, radiation oncology capacity, and payer coverage policies.
Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service setting, followed by benchmarks and payer coverage patterns where available, common billing modifiers, and relevant policy developments that affect utilization and reimbursement. The publication explains practical coding context, common sites of service, and what to expect in terms of administrative considerations for billing 61798 at a national level.
Data not provided in the input for specific ICD-10 pairings, taxonomies, or payer-specific rates are noted as unavailable; the content focuses on the code’s clinical meaning, service delivery context, and typical billing considerations.
Billing Code Overview
CPT code 61798 describes a procedure in which a provider uses externally generated ionizing radiation to destroy a single, complex cranial lesion in the brain. The designation of “complex” typically indicates a lesion larger than 3.5 cm, requiring specialized targeting and higher-dose delivery techniques.
-
Service type: Stereotactic radiosurgery for a single complex intracranial lesion
-
Typical site of service: Hospital outpatient department or specialized radiation oncology center
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a history of metastatic non–small cell lung cancer presents with progressive neurological symptoms and MRI demonstrating a solitary, complex intracranial metastasis measuring 4.2 cm in greatest dimension located in the right parietal lobe with surrounding vasogenic edema and mild mass effect. Multidisciplinary tumor board recommends stereotactic radiosurgery using a framed or frameless system delivering externally generated ionizing radiation to ablate the single, complex cranial lesion. The clinical workflow includes pre-procedure evaluation (neuro-oncology and neurosurgery consultation), high-resolution MRI and CT simulation for treatment planning, immobilization and stereotactic targeting, delivery of prescribed radiation dose in a single session (or hypofractionated session depending on planning), immediate post-treatment recovery and discharge instructions, and scheduled follow-up imaging to assess tumor response and potential radiation necrosis. Typical site of service is an outpatient hospital-based radiation oncology suite or ambulatory surgical center with stereotactic radiosurgery capability. Common clinical team members include a radiation oncologist, medical physicist, neurosurgeon (as consultant), radiation therapist, and specialized nursing staff.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician professional component of the service separate from technical resources. |