CPT 15757Surgery

Free skin flap microvasc

CPT code 15757 covers the transfer of a section of skin with its own blood supply (free flap) from one part of the body to another, reconnecting tiny blood vessels under a microscope to keep the tissue alive.

Showing rates for

National Average

Base Medicare rate

$2,199.89

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

37.15

PE RVU (NF)

25.08

MP RVU

5.78

Total RVU

68.01

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

NCCI bundling edits

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Billing tips

Document all vessel anastomoses with vessel diameter measurements and use of operative microscope in operative report
Impact: Prevents downcoding to simpler flap codes (15740) which reimburse $1320 less; protects full $2199.89 payment
Bill harvest site closure separately using appropriate intermediate or complex repair codes (12031-13160) when requiring layered closure
Impact: Can add $200-$800 in additional reimbursement depending on complexity and anatomic location
When prolonged operative time exceeds typical case by 2+ hours due to complexity, append modifier 22 with detailed operative note and cover letter
Impact: Successful modifier 22 claims typically increase payment by $440-$1100 (20-50% increase)
Verify that microsurgical supplies (microscope time, microsurgical instruments, vessel couplers) are separately billed by facility and not duplicated on professional claim
Impact: Prevents claim denials for duplicate billing; ensures clean claim processing
For revision or salvage procedures within the 90-day global period, use modifier 78 and document medical necessity for return to OR
Impact: Recovers 60-70% of fee ($1320-$1540) for legitimate reoperation versus no payment if unbilled
Do not separately bill for recipient site preparation or debridement on same date as 15757; these are considered bundled services
Impact: Avoids denial and recoupment of $150-$400 for unbundling violations

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 15757 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 15757 is $2199.89 for both facility and non-facility settings, based on 68.01 total RVUs and a conversion factor of 32.3465.

What is the difference between CPT 15757 and 15756?

CPT 15757 is for a free skin flap only with microvascular anastomosis, while 15756 covers a muscle, myocutaneous, or fasciocutaneous flap. Code selection depends on the tissue components included in the transferred flap, with 15757 specifically for skin-only transfers.

Can I bill for the donor site closure separately with CPT 15757?

Yes, donor site closure can be billed separately using intermediate (12031-12057) or complex repair codes (13100-13160) when the closure requires layered technique. Simple closures are considered inclusive in the 15757 payment.

How many RVUs is CPT code 15757 worth in 2025?

CPT 15757 has 68.01 total RVUs in 2025, consisting of 37.15 work RVUs, 25.08 practice expense RVUs, and 5.78 malpractice RVUs, making it one of the highest-valued reconstructive procedures.

Does CPT 15757 have a global period?

Yes, CPT 15757 has a 90-day global surgical period, meaning routine postoperative care for 90 days after the procedure is included in the reimbursement and cannot be billed separately.

What documentation is required to bill CPT 15757 instead of a simpler flap code?

Documentation must include use of operative microscope with magnification, vessel diameters (typically <1.5mm requiring microsurgical technique), specific identification of donor and recipient arteries and veins, description of microsurgical anastomosis technique, and confirmation that the flap is skin only without muscle or fascia components.

Can CPT 15757 be billed bilaterally with modifier 50?

Yes, modifier 50 can be used when bilateral free skin flap procedures are performed during the same operative session, which would increase total reimbursement to 150% of the single procedure rate ($5499.73), though bilateral cases are uncommon.