CPT code 0558T designates a CT scan specifically performed to assess biomechanical properties of anatomical structures — evaluating how tissues and joints work together to produce movement. Nationally, this code matters as an emerging, procedure-level designation for specialized functional imaging that supports surgical planning, orthopedics, sports medicine, and complex rehabilitative care. It signals payer recognition of advanced CT-based biomechanical assessment distinct from routine anatomic imaging. Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn clinical context for the service, typical sites of care, and what to expect in payer coverage patterns and benchmarking. The publication covers utilization benchmarks where available, coding and billing considerations tied to the code’s functional imaging intent, and implications for care pathways that rely on biomechanical data. The summary also outlines common modifiers associated with imaging services and notes areas where input data was not provided. This overview is written for a national audience seeking concise policy and operational context for CPT code 0558T.