Summary & Overview
CPT 73721: MRI of Lower Extremity Joint, without Contrast
CPT 73721 denotes a non-contrast magnetic resonance imaging study of any joint in the lower extremity. As a widely used diagnostic imaging service in orthopedics and sports medicine, this code is central to evaluating knee, ankle, hip, and related joint complaints, informing surgical planning and conservative management decisions. Nationally, non-contrast joint MRI is a common, high-value diagnostic tool given its soft-tissue resolution and lack of ionizing radiation.
Major payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise overview of coverage considerations and billing practices tied to 73721, highlights common clinical indications, and clarifies the typical outpatient hospital setting where these studies occur. Readers will find benchmarks for utilization context, comparisons to contrast-enhanced alternatives, and notes on documentation and coding relationships relevant to billing workflows. When specific input elements were unavailable, the text notes "Data not available in the input." The aim is to give coding, billing, and compliance professionals a clear, actionable summary of what 73721 represents, where it is commonly performed, and how it fits into diagnostic imaging for lower-extremity joint conditions.
CPT Code Overview
CPT 73721 describes magnetic resonance (proton) imaging of any lower extremity joint performed without intravenous contrast material. This procedure falls under Diagnostic Radiology (Diagnostic Imaging) Procedures of the Lower Extremities and is typically performed in an Outpatient Hospital (POS 22) setting. The code captures non-contrast MRI studies focused on joints of the lower limb to evaluate structural, degenerative, and traumatic conditions.
Clinical & Coding Specifications
Clinical Context
A middle-aged outpatient presents to an outpatient hospital radiology department with focal knee pain and mechanical symptoms after a twisting injury. The orthopedic clinic orders diagnostic imaging to evaluate for internal derangement. The patient checks in at the outpatient hospital (POS 22) and undergoes a non-contrast magnetic resonance imaging study of the affected lower extremity joint to assess ligaments, menisci, articular cartilage, and periarticular soft tissues. Imaging is performed by the hospital radiology technologist, interpreted by a radiologist, and results are communicated to the referring orthopedic surgeon for management planning.
Coding Specifications
Modifier 26 - Professional Component
- Use when reporting the radiologist’s interpretation and report separate from the technical service.
Modifier TC - Technical Component
- Use when reporting the facility/technical portion only (equipment, technician, and technical staff services).
Modifier 59 - Distinct Procedural Service
- Use when a separate, distinct imaging procedure or service is performed that is not usually reported together, to indicate a service unrelated to other services performed on the same day.
Associated provider taxonomies
| Taxonomy Code |
|---|