Bone/skin graft great toe

CPT 20973 covers the surgical procedure to harvest bone and skin tissue from the great toe (big toe) for use as a graft in reconstructive surgery elsewhere in the body. This is a complex microsurgical procedure involving the transfer of living tissue with its blood supply intact.

Showing rates for

National Average

Base Medicare rate

$2,923.48

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

47.27

PE RVU (NF)

33.46

MP RVU

9.65

Total RVU

90.38

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

NCCI bundling edits

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Billing tips

Always bill the recipient site microvascular transfer code (20969-20973 series) separately from 20973, as this code represents only the donor site harvest
Impact: Proper coding captures both procedures; failing to bill recipient site loses $3000-$5000 in additional reimbursement
Document the specific anatomical structures harvested including bone length, skin dimensions, and neurovascular pedicle details to support medical necessity
Impact: Comprehensive documentation reduces denial risk by 60-70% for this high-value code worth $2923.48
Use modifier 59 or XU when billing with recipient site codes to clearly distinguish donor versus recipient procedures and prevent bundling edits
Impact: Prevents automatic denials that could delay payment by 30-60 days and require appeals
Confirm pre-authorization for microsurgical reconstruction as most payers require prior approval for great toe transfers given the high complexity and cost
Impact: Obtaining pre-auth prevents denials on $10,000+ combined procedures and reduces payment delays
Bill facility and professional components separately when performed in hospital setting; ensure surgeon bills professional with place of service 22
Impact: Both facility and professional rates are $2923.48 for this code; proper split billing captures full payment
When two surgical teams work simultaneously (one on donor site, one on recipient), document co-surgery justification and bill with modifier 62 for each surgeon
Impact: Allows each surgeon to receive $1827.18 instead of splitting a single payment, increasing total reimbursement to $3654.36

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 20973 in 2025?

The 2025 Medicare national average reimbursement for CPT 20973 is $2923.48 for both facility and non-facility settings. This rate is based on 90.38 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic location due to GPCI adjustments.

Can CPT 20973 be billed together with the recipient site microvascular transfer code?

Yes, CPT 20973 should be billed separately from the recipient site procedure as it represents only the donor site harvest. Use modifier 59 or XU to indicate these are distinct procedural services performed at separate anatomical sites. Both procedures are separately reimbursable and medically necessary for complete toe-to-thumb or toe-to-finger reconstruction.

What documentation is required to support billing CPT 20973?

Required documentation includes detailed operative notes describing the specific bone and skin components harvested, neurovascular pedicle identification and preservation, microsurgical technique used, graft dimensions and measurements, donor site closure method, and medical necessity for great toe as the graft source. Lack of microsurgical technique documentation may result in downcoding to simpler graft codes.

Does CPT 20973 require pre-authorization from insurance?

Most commercial payers and Medicare Advantage plans require pre-authorization for CPT 20973 due to the high cost and complexity of microsurgical toe transfers. Traditional Medicare does not require pre-authorization, but documentation of medical necessity must support the procedure. Always verify payer-specific requirements before scheduling.

What is the difference between CPT 20973 and other bone graft codes?

CPT 20973 is specific to composite bone and skin graft harvest from the great toe with microvascular pedicle preservation, typically for free tissue transfer. This differs from simple bone graft codes (20900-20902) which involve bone only without skin or vascular pedicle, and from other composite graft codes by the specific anatomical donor site (great toe). The microsurgical component and toe-specific anatomy justify the higher RVU value of 90.38.

How many RVUs is CPT code 20973 worth in 2025?

CPT 20973 has 90.38 total RVUs in 2025, broken down as follows: 47.27 work RVUs, 33.46 practice expense RVUs (same for both facility and non-facility settings), and 9.65 malpractice RVUs. This high RVU value reflects the complexity and risk of microsurgical toe harvest procedures.

What specialists typically bill CPT code 20973?

CPT 20973 is primarily billed by plastic and reconstructive surgeons, hand surgeons, and orthopedic surgeons with fellowship training in hand and microsurgery. The procedure requires specialized microsurgical skills and is typically performed at academic medical centers or specialty hospitals with microsurgery programs and appropriate equipment including surgical microscopes and microsurgical instruments.