CPT code 67218 represents temporary intraocular brachytherapy: placement of a radiotherapeutic source within the eye to treat a cancerous retinal lesion with removal after four to five days. This targeted local radiation technique is a key treatment option for certain intraocular malignancies and carries implications for surgical scheduling, radiation safety, and specialist coordination across ophthalmology and radiation oncology. Nationally, the procedure matters for access to ocular oncology services and for payer coverage policies that influence provider facility selection and reimbursement pathways. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for the procedure, typical sites of service, and payer coverage landscape. The publication summarizes common billing modifiers associated with surgical and radiation services (input-provided list), highlights what information is available and what is not supplied, and outlines areas relevant to coding and billing workflows such as service classification and expected care setting. Data not available in the input is explicitly noted where applicable.