CPT Code 73221: MRI of the Shoulder

Magnetic Resonance Imaging (MRI) is a cornerstone of modern diagnostic radiology, providing unparalleled insights into soft tissue structures. Among the most commonly performed musculoskeletal MRI exams is the shoulder MRI, which is billed under CPT code 73221. This imaging study is crucial for diagnosing rotator cuff tears, labral injuries, ligament damage, and other shoulder pathologies.

This comprehensive guide explores CPT code 73221 in depth, covering its definition, procedural details, associated diagnosis codes, clinical relevance, and cost considerations. Whether you’re a healthcare provider, coder, or patient, this article will provide valuable insights into this essential diagnostic tool.

cpt code 73221

2. What is CPT Code 73221?

CPT code 73221 is a Current Procedural Terminology (CPT) code used to describe a non-contrast MRI of the shoulder. The American Medical Association (AMA) defines it as:

“Magnetic resonance (e.g., proton) imaging, any joint of upper extremity; without contrast material.”

This code is specifically for unenhanced MRI studies of the shoulder joint. If contrast is administered, a different code (73223) should be used.

Key Features of CPT 73221

Non-contrast imaging (no IV dye used)
Covers any joint of the upper extremity, but most commonly used for the shoulder
Includes multiple imaging sequences (T1-weighted, T2-weighted, PD, etc.)

3. CPT 73221 Description

A shoulder MRI under CPT 73221 involves high-resolution imaging of:

Rotator cuff muscles and tendons (supraspinatus, infraspinatus, teres minor, subscapularis)
Glenoid labrum (for SLAP tears)
Biceps tendon (long head)
Bones (humerus, clavicle, scapula)
Ligaments and cartilage

When is CPT 73221 Used?

Rotator cuff tears (partial or full thickness)
Shoulder impingement syndrome
Labral tears (SLAP lesions)
Shoulder instability (Bankart lesions)
Fractures not visible on X-rays
Inflammatory conditions (arthritis, bursitis)

4. CPT Code 73221 Procedure

Step-by-Step MRI Shoulder Process

Patient Preparation
- Remove all metal objects (jewelry, piercings).
- Change into a hospital gown if necessary.
- Lie supine (on the back) with the shoulder in a neutral position.
Positioning in the MRI Machine
- A shoulder coil is placed around the joint for high-resolution imaging.
- The patient must remain still for 20-45 minutes.
Imaging Sequences
- T1-weighted: Evaluates anatomy (muscles, tendons, bones).
- T2-weighted: Detects fluid (edema, inflammation, tears).
- Proton Density (PD): Highlights cartilage and labrum.
Post-Processing & Interpretation
- A radiologist analyzes the images and generates a report.

5. Billable Diagnosis Codes for 73221

For insurance reimbursement, CPT 73221 must be linked to an appropriate ICD-10 diagnosis code. Common billable codes include:

ICD-10 Code	Diagnosis Description
M75.100	Unspecified rotator cuff tear
M75.110	Complete rotator cuff tear
S43.431A	Superior labral tear (SLAP lesion)
M75.51	Bursitis of shoulder
M19.011	Primary osteoarthritis, right shoulder

*Table 1: Common ICD-10 Codes for Shoulder MRI (73221)*

6. MRI Shoulder CPT Code 73221: Clinical Applications

Why Choose MRI Over Other Imaging Modalities?

Superior soft tissue contrast compared to X-rays or CT scans.
No ionizing radiation (safer for repeated imaging).
Multiplanar imaging (axial, coronal, sagittal views).

Common Findings on Shoulder MRI

Rotator cuff tears (partial vs. full thickness)
Labral tears (Bankart, SLAP lesions)
Adhesive capsulitis (frozen shoulder)
Osteoarthritis & bone marrow edema

7. CPT Code 73221 Cost and Reimbursement

Average Cost of Shoulder MRI (73221)

Without insurance: $500 – $3,000 (varies by facility).
With insurance: $100 – $500 copay (subject to deductible).

Medicare Reimbursement Rates (2024)

Facility fee: $250 – $400
Professional fee (radiologist): $100 – $200

8. Conclusion

CPT code 73221 is essential for diagnosing shoulder pathologies via non-contrast MRI. It provides detailed imaging of soft tissues, aiding in the detection of rotator cuff tears, labral injuries, and arthritis. Proper coding (ICD-10 linkage) ensures reimbursement, while understanding costs helps patients plan financially.

CPT Code 73221: MRI of the Shoulder