CPT 23921Surgery

Disarticulation sho sec clsr

CPT code 23921 represents a surgical procedure where a surgeon performs a secondary closure after a shoulder disarticulation, which is the surgical removal of the arm at the shoulder joint. This follow-up procedure closes the surgical site when the initial wound couldn't be closed immediately.

Showing rates for

National Average

Base Medicare rate

$471.61

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)

7.7

MP RVU

1.16

Total RVU

14.58

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

NCCI bundling edits

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Billing tips

Always append modifier 58 when secondary closure is planned at the time of initial disarticulation to establish it as a staged procedure
Impact: Ensures full reimbursement of $471.61 instead of denial as included in global period; can recover 100% of fee that would otherwise be bundled
Document the time interval between initial disarticulation and secondary closure, including specific reasons why primary closure was not possible
Impact: Reduces denial risk by 70-80%; justifies medical necessity for staged approach and separates from primary procedure code 23920
Include measurements of wound dimensions, description of wound bed condition, and specific closure techniques (layers closed, suture types, tissue rearrangement)
Impact: Supports medical necessity and complexity; critical for modifier 22 consideration which can increase payment by $94-$236
Bill facility and non-facility rates identically at $471.61 based on actual place of service; verify POS code matches service location
Impact: Both rates are equal for this code, simplifying billing; incorrect POS code can trigger audit or payment delay
Cross-reference with initial disarticulation code 23920 to ensure secondary closure is not already included in the primary procedure payment
Impact: Prevents unbundling violations; if billed together on same date without modifier 58, expect automatic denial and potential audit
For commercial payers, obtain prior authorization for planned staged procedures before the initial disarticulation when possible
Increases approval rate by 60-90% and prevents retrospective denials; many commercial payers require predetermination for amputations exceeding $10,000 total

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 23921 in 2025?

The 2025 Medicare national average reimbursement for CPT 23921 is $471.61 for both facility and non-facility settings. This rate is based on 14.58 total RVUs (5.72 work RVU, 7.7 practice expense RVU, and 1.16 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

How is CPT 23921 different from CPT 23920 shoulder disarticulation?

CPT 23920 describes the primary shoulder disarticulation amputation procedure, while CPT 23921 specifically covers the secondary closure performed after the initial amputation when immediate primary closure was not feasible. Code 23921 is used for the delayed closure procedure typically performed days or weeks after the initial disarticulation once wound conditions are optimal.

Can CPT 23921 be billed on the same day as the initial shoulder disarticulation?

No, CPT 23921 should not typically be billed on the same date as the initial disarticulation (23920) because it specifically describes secondary (delayed) closure. If billed together, modifier 58 should be used to indicate a planned staged procedure, though same-day billing would be unusual as secondary closure by definition occurs after wound observation and preparation following the initial procedure.

What modifier should I use when billing CPT 23921 during the global period of the initial amputation?

Use modifier 58 when the secondary closure was planned as a staged procedure at the time of initial disarticulation. If the secondary closure is due to a complication requiring return to the operating room, use modifier 78. Modifier 58 allows full separate payment, while modifier 78 results in payment for only the intraoperative portion of the service.

What documentation is required to support medical necessity for CPT 23921?

Documentation must include the clinical rationale for delayed closure (such as infection, contamination, tissue viability concerns, or patient instability at initial surgery), description of wound care between procedures, current wound assessment showing readiness for closure, detailed closure technique with layers closed, and reference to the initial disarticulation procedure with date and reason primary closure was not performed.

Does CPT 23921 require prior authorization from insurance companies?

Prior authorization requirements vary by payer. Medicare typically does not require prior authorization for CPT 23921, but many commercial payers do require authorization for amputation-related procedures. When the secondary closure is planned at the time of initial disarticulation, it's best practice to obtain authorization for both the primary amputation and secondary closure procedures together to prevent payment delays.

What are the typical time intervals between initial shoulder disarticulation and secondary closure with CPT 23921?

Secondary closure is typically performed 3-14 days after initial disarticulation, depending on wound healing progression, infection resolution, and tissue perfusion adequacy. The specific timing should be documented based on clinical assessment of wound readiness. Very short intervals (24-48 hours) may face scrutiny regarding why primary closure wasn't performed, while extended intervals (beyond 3 weeks) may require additional justification for delayed definitive closure.