Mt bone graft microvasc

CPT code 20957 covers the surgical procedure of harvesting and transplanting bone tissue with its blood vessels (microvascular technique) from one part of the body to another to repair bone defects or injuries.

Showing rates for

National Average

Base Medicare rate

$2,681.85

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

42.61

PE RVU (NF)

31.61

MP RVU

8.69

Total RVU

82.91

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

NCCI bundling edits

Loading bundling edits…

Billing tips

Document exact microsurgical technique including vessel sizes, anastomosis method, and confirmation of blood flow to support 20957 rather than non-vascularized graft codes
Impact: Prevents downcoding to lower-paying conventional bone graft codes (20900-20902 at $200-500 range) versus $2,681.85 for microvascular technique
Bill only once per operative session regardless of number of bone segments transferred; code is per procedure not per graft segment
Impact: Prevents automatic denials for duplicate billing; bundled nature of code already accounts for complete reconstruction
Separately report the specific recipient site code (e.g., mandible reconstruction 21194, radius reconstruction 25420) when payer policy allows unbundling
Impact: Some commercial payers allow separate payment for recipient site preparation adding $1,000-3,000; verify payer-specific bundling edits before billing
Use modifier 22 with comparative operative time data when case exceeds typical 6-8 hour operative time or involves unusual anatomical challenges
Impact: Can add $536-1,341 (20-50% increase) with strong documentation; include percentage increase requested and side-by-side comparison to typical case
Verify global period (090 days) and avoid billing evaluation services during postoperative period without appropriate modifiers
Impact: Prevents denials of legitimate E/M services; use modifier 24 for unrelated E/M visits during global to preserve payment
For co-surgeon scenarios, ensure both operative reports clearly delineate distinct roles and obtain advance payer approval when required

Live Field Datano reports yet

Real billers contribute denial patterns and appeal strategies for this code. Once 5+ reports come in, you’ll see live aggregated data here — the only place this exists, free.

Working with CPT 20957?

Get the free Revenue Protection Toolkit — the denial triggers, modifier pitfalls, and bundling conflicts that quietly cost you reimbursement. Instant download.

Help build the field knowledge

MedPayIQ gets smarter as billers contribute. If you've had this code denied, share what happened so others learn from it. Anonymous, no patient info.

Related actions

Frequently asked questions

What is the Medicare reimbursement rate for CPT code 20957 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 20957 is $2,681.85 for both facility and non-facility settings. This rate is based on 82.91 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic locality based on the Geographic Practice Cost Index (GPCI) adjustments.

Can CPT 20957 be billed with modifier 50 for bilateral procedures?

Yes, CPT 20957 can be billed with modifier 50 when bilateral microvascular bone grafts are performed during the same operative session. Medicare typically reimburses bilateral procedures at 150% of the unilateral rate, resulting in approximately $4,022.78 for bilateral microvascular bone grafts, though this must meet medical necessity requirements.

What is the difference between CPT 20957 and non-vascularized bone graft codes?

CPT 20957 specifically requires microsurgical anastomosis of blood vessels (artery and vein) to maintain viability of the transplanted bone, while non-vascularized codes (20900-20902) involve bone transfer without maintaining blood supply. The microvascular technique is more complex, has higher reimbursement ($2,681.85 vs $200-500), and requires documentation of vessel anastomosis under microscopic magnification.

How many RVUs is CPT code 20957 worth in 2025?

CPT 20957 has a total of 82.91 RVUs in 2025, comprised of 42.61 work RVUs, 31.61 practice expense RVUs, and 8.69 malpractice RVUs. This high RVU value reflects the complexity and time required for microsurgical bone transfer with vascular anastomosis.

Can you bill CPT 20957 with recipient site reconstruction codes?

Billing CPT 20957 with recipient site codes depends on payer-specific policies and NCCI edits. Some payers allow separate billing for distinct recipient site preparation (such as mandible reconstruction 21194 or radius reconstruction 25420) when performed in addition to the microvascular graft, while others bundle these services. Always verify payer policy and use appropriate modifiers (59, XU) when unbundling is permitted with proper documentation.

What documentation is required to support medical necessity for CPT 20957?

Medical necessity documentation must include pre-operative assessment showing the bone defect size and location, failed conventional treatments or reasons why non-vascularized grafts would be inadequate, patient factors affecting bone healing (smoking, diabetes, radiation history), imaging studies demonstrating the defect, and clinical rationale for choosing microvascular technique. The operative report must detail the microsurgical anastomosis technique with vessel identification and patency confirmation.

What is the global period for CPT code 20957?

CPT 20957 has a 90-day global surgical period. This means routine postoperative care for 90 days following the procedure is included in the reimbursement and cannot be separately billed. Any evaluation and management services during this period require modifier 24 (unrelated E/M) or 25 (significant, separately identifiable E/M on same day) to receive separate payment, and complications requiring return to OR use modifier 78 or 79 depending on whether related or unrelated to original procedure.