CPT code 97018 denotes a paraffin bath procedure in which paraffin wax is applied to joints or a limb is dipped into a paraffin wax solution to deliver localized superficial heat. Nationally, paraffin therapy is a commonly billed physical modality for symptomatic relief of joint and soft-tissue pain, particularly for hand, wrist, and lower-extremity conditions. The code matters because payers apply differing coverage and bundling rules for modality-based services, affecting therapy planning and reimbursement across outpatient settings.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical use of the modality, common diagnostic conditions that justify use, related modality codes for comparison, and practical billing context such as typical sites of service. The publication also outlines benchmarking considerations and payer-specific policy themes that influence utilization and prior authorization practices. Practical takeaways include code relationships to other physical modality CPT codes and clinical contexts where paraffin bath therapy is frequently employed. This summary serves clinicians, coders, and policy stakeholders seeking a national-level briefing on procedure definition, clinical role, and payer coverage landscape for 97018.