CPT code 77073 denotes full-length lower extremity radiographic imaging from hips to ankles performed to measure leg-length discrepancy. This diagnostic procedure is clinically important for evaluating limb-length inequality that can contribute to gait abnormalities, back pain, and orthopedic planning for interventions such as epiphysiodesis or limb-lengthening procedures. Nationally, accurate measurement and consistent coding support care coordination between primary care, orthopedics, and rehabilitation services.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical intent and typical sites of service, plus what to expect in payer coverage frameworks and billing practice. The publication highlights billing and coding considerations for documentation of imaging from hips through ankles and provides benchmarks and policy context where available. It also outlines common clinical scenarios prompting measurement of leg-length discrepancy and intended use cases of the imaging study.

This material is written for clinicians, billing professionals, and policy analysts seeking a national perspective on the code’s clinical role, coding context, and payer landscape. Data not available in the input is noted where applicable.