South Carolina Subscriber
Answer: You didn't state your patient's age, so 73592 (Radiologic examination; lower extremity, infant, minimum of two views) may be appropriate, but only if the patient is an infant.
If you performed the study on both lower extremities for the clinical question of leg length discrepancy, you probably performed a bone length study, otherwise known as a "scanogram" or an "orthoroentgenogram." If this is what you performed, you should report 76040 (Bone length studies [orthoroentgenogram, scanogram). This code describes a single view of both lower extremities.
If the patient has a multijoint disorder and you obtain single views of two or more joints, you should instead report 76066 (Joint survey, single view, two or more joints [specify]). In such cases, each of the joints is usually imaged on separate films to improve diagnostic accuracy.