CPT code 73221 covers magnetic resonance imaging of any upper extremity joint performed without contrast material. That includes the shoulder, elbow, wrist, and the joints of the hand. The American Medical Association maintains it inside the diagnostic radiology range for upper extremities.

You’re probably here because a claim came back denied, or because you’re staring at an order for bilateral shoulder MRIs and you’re not sure whether that’s one line or two. We’ll cover both..

What does CPT 73221 include?

73221 reports an MRI of a single upper extremity joint with no intravenous gadolinium administered. The joints in scope are the glenohumeral joint, the acromioclavicular joint, the elbow complex, the radiocarpal joint, and the intercarpal joints.

The code covers a global service by default. That means the technical component (scanner time, technologist labor, facility overhead) plus the professional component (the radiologist read). Hospital based radiologists who only interpret the study append modifier 26 and bill the professional side alone. The facility then bills the technical side with modifier TC.

One distinction trips up new coders constantly. 73221 is a joint code. Codes like 73218 through 73220 cover MRI of the upper extremity other than a joint, meaning the humerus, forearm, or soft tissue of the arm. Joint codes bill per joint. Non joint codes bill once per extremity.

If your team keeps losing time to this distinction, our outsourced medical coding services handle radiology coding end to end.

73221 vs 73222 vs 73223: which code do you report?

Contrast decides the code. Nothing else in the trio changes.

Two rules keep this clean. First, if the radiologist ran noncontrast sequences and then administered gadolinium during the same encounter, report 73223 alone. Don’t stack 73221 and 73222. Second, MR arthrography changes the picture entirely, because intraarticular contrast injection carries its own procedure code alongside the imaging code.

Can you bill 73221 more than once in the same session?

Yes. 73221 bills per joint, so a study covering the right shoulder and the right wrist supports two units.

The documentation has to back it up. You need a separate order for each joint and a separate dictated report for each joint. One combined report describing both joints will not survive an audit, and most payers will recoup on review.

Report it on two lines. Append RT or LT to each line to show laterality. Add modifier 59 (or the appropriate X modifier, depending on payer preference) to the second line to signal a distinct anatomic site. Some payers now prefer XS over 59 for separate structure. Check your payer policy before you standardize the workflow.

Persistent modifier denials usually point at a workflow problem, not a coder problem. Our denial management services trace the edit back to its source.

What does Medicare pay for CPT 73221?

Medicare reimburses 73221 through the Physician Fee Schedule, and the amount splits across technical and professional components. National unadjusted rates run roughly 220 to 260 dollars for the global service, though your Medicare Administrative Contractor applies a geographic practice cost index that moves the number meaningfully.

Look up your actual rate rather than working from a national figure. CMS publishes the searchable fee schedule and it takes about two minutes.

Common denial reasons for 73221

Four causes account for most 73221 denials.

• Missing or wrong laterality modifier. No RT or LT on a paired anatomic site triggers an immediate edit.
• Medical necessity mismatch. The linked ICD-10 code doesn’t appear on the payer’s covered diagnosis list. Rotator cuff tears, labral pathology, and occult fracture evaluation generally support coverage.
• No prior authorization. Advanced imaging sits behind prior auth with nearly every commercial payer. Radiology benefit managers like eviCore and Carelon manage it for many plans.
• Contrast code mismatch. Billing 73221 when the report documents gadolinium administration.

Documentation that supports the claim

The order needs the referring physician’s name, the specific joint, the laterality, and the clinical indication. The report needs the technique described, the sequences performed, an explicit statement that no contrast was administered, findings, and an impression. Sign and date it.

If the study covers two joints, all of that duplicates. Two orders. Two reports.

Frequently asked questions

Is CPT Code 73221 billed per joint or per extremity?

Per joint. A study of the right shoulder and right elbow supports two units, provided each joint has its own order and its own dictated report.

What is the difference between 73221 and 73218?

73221 covers a joint of the upper extremity. 73218 covers the upper extremity other than a joint, meaning the humerus, forearm, or arm soft tissue. Joint codes bill per joint. Non joint codes bill once per extremity.

Does 73221 require prior authorization?

Most commercial payers require it for advanced imaging. Traditional Medicare generally does not, though Medicare Advantage plans usually do. Verify per payer before scheduling.

Can I use modifier 50 for bilateral shoulder MRI?

Most payers reject modifier 50 on 73221 and expect two lines with RT and LT plus a distinct service modifier on the second. Confirm the payer’s bilateral indicator before submitting.

Which modifier separates the professional component?

Modifier 26 reports the radiologist’s interpretation alone. Modifier TC reports the technical component. Omit both to bill the global service.

What ICD-10 codes support medical necessity for 73221?

Coverage depends on the payer’s local coverage determination. Rotator cuff disorders in the M75 series, shoulder joint derangement in the M24 series, and traumatic injury codes commonly support it. Check your MAC’s LCD.

Does 73221 include contrast?

No. Use 73222 for imaging with contrast and 73223 when the session includes both noncontrast and postcontrast sequences.