CPT 79440Radiology

Nuclear rx intra-articular

CPT code 79440 covers radioactive substance injection directly into a joint space to treat inflammatory conditions like rheumatoid arthritis or persistent joint effusions. This therapeutic nuclear medicine procedure delivers targeted radiation to reduce inflammation and pain in affected joints.

Showing rates for

National Average

Base Medicare rate

$114.18

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

1.99

PE RVU (NF)

1.5

MP RVU

0.04

Total RVU

3.53

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Bill the radiopharmaceutical separately using appropriate HCPCS A-code (A9600 for strontium-89, A9543 for yttrium-90, etc.) in addition to CPT 79440
Impact: Radiopharmaceuticals can cost $500-$3,000+ and are separately reimbursable; failure to bill these results in significant revenue loss
Do not bill arthrocentesis code 20610 on the same claim with 79440 when the aspiration is performed solely to inject the radiopharmaceutical
Impact: Prevents bundling denials; arthrocentesis is included in 79440 when part of the same procedure. Billing both results in automatic denial and potential audit flags
Document the specific radioisotope used, dosage in millicuries, joint injected, and radiation safety protocols followed
Impact: Comprehensive documentation reduces audit risk and supports medical necessity; missing radioisotope details can trigger 100% payment denial
Verify prior authorization requirements before procedure as many payers require pre-approval for therapeutic nuclear medicine procedures
Impact: Lack of prior authorization is the leading cause of denials for 79440, resulting in complete non-payment of the $114.18 Medicare rate plus radiopharmaceutical costs
When treating multiple joints in the same session, append modifier 59 to the second and subsequent procedures and ensure each has distinct laterality modifiers
Impact: Enables payment for multiple joint treatments (potential $228.36 for two joints); without proper modifiers, only one joint will be reimbursed
Link diagnosis codes clearly demonstrating failed conservative treatment and medical necessity for radiation synovectomy (chronic synovitis, recurrent effusion despite medical management)

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 79440 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 79440 is $114.18 for both facility and non-facility settings. This rate is based on 3.53 total RVUs multiplied by the 2025 conversion factor of $32.3465. Note that actual reimbursement may vary by geographic location due to locality adjustments.

Can I bill CPT 79440 with an arthrocentesis code on the same day?

No, you should not bill arthrocentesis codes (20600, 20605, 20610) with CPT 79440 when the aspiration is performed solely to inject the radiopharmaceutical. The arthrocentesis is considered included in the radiation synovectomy procedure. However, if a separate diagnostic arthrocentesis was performed on a different joint or for a distinct purpose earlier in the day, it may be billable with modifier 59 and appropriate documentation.

What radiopharmaceuticals are used for CPT code 79440?

Common radiopharmaceuticals for 79440 include yttrium-90 (Y-90) silicate or citrate for medium to large joints, phosphorus-32 (P-32) chromic phosphate for larger joints, samarium-153 for specific applications, and rhenium-186 sulfide. The specific agent chosen depends on joint size, with Y-90 most commonly used for knees. These must be billed separately using appropriate HCPCS codes (A9543 for Y-90, A4642 for P-32).

How many RVUs is CPT code 79440 worth?

CPT code 79440 has a total of 3.53 RVUs for 2025, consisting of 1.99 work RVUs, 1.5 practice expense RVUs (both facility and non-facility), and 0.04 malpractice RVUs. This moderate RVU value reflects the technical skill, radiation safety requirements, and procedural complexity of intra-articular radiopharmaceutical administration.

Does CPT 79440 require prior authorization?

Most commercial payers and Medicare Advantage plans require prior authorization for CPT 79440 due to the use of therapeutic radiopharmaceuticals and the specialized nature of radiation synovectomy. Traditional Medicare does not typically require prior authorization, but medical necessity must still be documented. Always verify authorization requirements with the specific payer before scheduling the procedure to avoid denials.

What diagnosis codes support medical necessity for CPT 79440?

Diagnosis codes supporting 79440 include M06.9 (rheumatoid arthritis, unspecified), M12.36 (palindromic rheumatism of knee), M12.46 (intermittent hydrarthrosis of knee), M25.46 (effusion of knee), M12.2X (villonodular synovitis), D66-D68 (hemophilic arthropathy), and related chronic inflammatory joint conditions. Documentation must show that conservative treatments including medications, injections, and physical therapy have failed before radiation synovectomy.

Can CPT 79440 be billed for multiple joints on the same day?

Yes, CPT 79440 can be billed for multiple joints treated during the same session. Bill the first joint without a modifier (or with RT/LT for laterality), then append modifier 59 to subsequent joint injections along with appropriate laterality modifiers. Each joint must be documented separately with its own radiopharmaceutical dosage, and medical necessity must be established for each site. Payment for each additional joint is typically at the full allowable rate of $114.18.