CPT 23101Surgery

Shoulder joint surgery

CPT 23101 covers an open surgical procedure where a surgeon makes an incision to access the shoulder joint (glenohumeral joint), typically to drain infection, remove foreign bodies, or explore joint pathology.

Showing rates for

National Average

Base Medicare rate

$457.70

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

5.72

PE RVU (NF)

7.27

MP RVU

1.16

Total RVU

14.15

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

NCCI bundling edits

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Billing tips

Always append laterality modifier (LT or RT) as first modifier on the claim
Impact: Prevents automatic denial; claims without laterality will reject at clearinghouse or payer level
Document specific indication for open arthrotomy versus arthroscopy in operative note
Impact: Justifies medical necessity; prevents downcoding to less invasive procedure or denial for inappropriate procedure selection
Separately report synovial biopsy (20605 or 20606) only if performed through different incision
Impact: Biopsy through same arthrotomy incision is included; separate reporting risks $200-300 recoupment
Use appropriate infection diagnosis code (M00.91 for septic arthritis) to support drainage indication
Impact: Improves first-pass payment rate by 35-40% compared to generic pain codes
Bill facility and non-facility rates correctly based on place of service
Impact: Both rates are $457.70 for 23101, but verify POS code matches actual location to avoid audit
Review NCCI edits before billing with manipulation codes (23700) or fracture treatment
Impact: 23101 may bundle with certain fracture care codes; prevents $300-500 in denied secondary procedures

Common denials

Medical necessity not established - request for arthroscopic approach instead

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 23101 in 2025?

The 2025 Medicare national average reimbursement for CPT 23101 is $457.70 for both facility and non-facility settings. This is based on 14.15 total RVUs multiplied by the 2025 conversion factor of 32.3465.

Can CPT 23101 be billed bilaterally with modifier 50?

Yes, CPT 23101 can be billed bilaterally using modifier 50 if arthrotomy is performed on both shoulders during the same operative session. Medicare typically reimburses bilateral procedures at 150% of the unilateral rate, which would be approximately $686.55.

What is the difference between CPT 23101 and shoulder arthroscopy codes?

CPT 23101 is an open arthrotomy requiring a surgical incision through skin and joint capsule, while arthroscopy codes (29805-29828) use small portal incisions and camera visualization. Open arthrotomy is typically reserved for cases requiring wider exposure, such as extensive infection, significant foreign body removal, or when arthroscopy has failed or is contraindicated.

How many RVUs is CPT 23101 worth in 2025?

CPT 23101 has 14.15 total RVUs in 2025, consisting of 5.72 work RVUs, 7.27 practice expense RVUs (both facility and non-facility), and 1.16 malpractice RVUs.

What diagnosis codes support medical necessity for CPT 23101?

Common supporting diagnosis codes include M00.91 (septic arthritis of shoulder), M25.511-M25.512 (shoulder joint pain), M75.00-M75.02 (adhesive capsulitis), T81.5 (retained foreign body), and S43.0 (shoulder dislocation with joint exploration). Infection diagnoses generally have highest approval rates for open arthrotomy.

Is CPT 23101 subject to the global surgical package?

Yes, CPT 23101 has a 90-day global period. This means the reimbursement includes preoperative evaluation (typically 1 day before), the procedure itself, and all routine postoperative care for 90 days following surgery. Any complications requiring return to OR require modifier 78 or 79.

Can I bill a synovial biopsy separately with CPT 23101?

A synovial biopsy performed through the same arthrotomy incision is considered bundled and cannot be separately reported. Only if biopsy is performed through a separate distinct incision or site can it potentially be billed separately with appropriate modifier 59, though this scenario is rare for shoulder arthrotomy.