CPT 23105Surgery

Remove shoulder joint lining

CPT code 23105 covers the surgical removal of the synovium (inner lining) of the shoulder joint, typically performed to treat inflammatory conditions like rheumatoid arthritis or chronic synovitis that haven't responded to conservative treatment.

Showing rates for

National Average

Base Medicare rate

$638.20

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

8.48

PE RVU (NF)

9.53

MP RVU

1.72

Total RVU

19.73

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

NCCI bundling edits

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Billing tips

Clearly document whether the approach was arthroscopic or open in the operative report, as confusion with arthroscopic debridement codes (29822-29823) can lead to downcoding
Impact: Prevents $200-400 downcoding to lesser-valued arthroscopic debridement procedures
When billing with concurrent shoulder stabilization or rotator cuff repair, append modifier 59 and provide documentation showing synovectomy was a distinct, separately identifiable procedure beyond routine debridement
Impact: Maintains full $638.20 reimbursement instead of bundled denial
For Medicare patients, ensure laterality modifiers (LT/RT) are included; failure to specify results in automatic claim rejection under Medicare's laterality requirement
Impact: Prevents claim rejection and payment delays of 14-30 days for resubmission
Document percentage of synovium removed and specific anatomical areas addressed (anterior, posterior, superior, inferior compartments) to support medical necessity and potential modifier 22 use
Impact: Enables modifier 22 claims for 20-50% additional reimbursement ($127.64-$319.10) when extensive
Verify diagnosis code supports medical necessity (M05-M06 series for rheumatoid arthritis, M12.2 for villonodular synovitis); inflammatory codes have higher approval rates than non-specific joint pain
Impact: Reduces denial rate from 15-20% to under 5% for medical necessity
Submit pathology reports confirming synovial tissue removal when available, especially for initial claims or high-risk diagnoses like PVNS
Decreases audit risk and supports medical necessity, reducing post-payment review probability

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 23105 in 2025?

The 2025 Medicare national average reimbursement for CPT 23105 is $638.20 for both facility and non-facility settings. This rate is calculated using 19.73 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payments may vary by geographic location based on local wage indices and GPCI adjustments.

Is CPT 23105 performed arthroscopically or as an open procedure?

CPT 23105 encompasses both open and arthroscopic approaches to shoulder synovectomy. The code descriptor does not specify approach, so both techniques are reported with the same code. Clear documentation of the surgical approach is essential for medical necessity and to distinguish from limited arthroscopic debridement codes (29822-29823) which carry different reimbursement rates.

Can CPT 23105 be billed with rotator cuff repair on the same shoulder?

Yes, CPT 23105 can be billed with rotator cuff repair codes (29827, 23410-23412), but requires modifier 59 or XU to indicate a distinct procedural service. Documentation must clearly show the synovectomy was separately identifiable and not merely incidental debridement. The synovectomy should be medically necessary due to inflammatory disease or synovial pathology beyond routine debridement during cuff repair.

What diagnosis codes support medical necessity for CPT 23105?

Primary supporting diagnoses include rheumatoid arthritis (M05.41-M05.42), inflammatory polyarthropathies (M06.21-M06.22), pigmented villonodular synovitis (M12.20-M12.22), synovial chondromatosis (M11.20-M11.22), and hemarthrosis (M25.01-M25.02). Documentation should include failed conservative treatment for inflammatory conditions and diagnostic imaging or prior surgical findings supporting synovial pathology.

What are the total RVUs for CPT code 23105 in 2025?

CPT 23105 has 19.73 total RVUs in 2025, consisting of 8.48 work RVUs, 9.53 practice expense RVUs (both facility and non-facility), and 1.72 malpractice RVUs. This relatively high RVU value reflects the technical complexity and surgical time required for comprehensive shoulder synovectomy.

How much conservative treatment is required before billing 23105?

While no universal standard exists, most payers require documentation of 3-6 months of failed conservative treatment before approving shoulder synovectomy. This typically includes physical therapy (6-12 weeks), medication trials (NSAIDs, corticosteroids, or DMARDs for inflammatory conditions), and at least one corticosteroid injection. Documentation should demonstrate progressive symptoms despite appropriate non-operative management.

Does CPT 23105 require a laterality modifier for Medicare billing?

Yes, CPT 23105 requires a laterality modifier (LT for left shoulder, RT for right shoulder) for Medicare and most commercial payers. Medicare implemented mandatory laterality reporting for shoulder procedures, and claims missing these modifiers will be automatically rejected. Always append the appropriate modifier to indicate which shoulder underwent synovectomy.