CPT 15600Surgery

Delay flap trunk

CPT 15600 covers the first stage of a two-part skin flap procedure on the trunk, where the surgeon partially lifts skin tissue and reattaches it to develop new blood supply before the final transfer. This delay technique helps ensure the flap survives when fully moved in a later surgery.

Showing rates for

National Average

Base Medicare rate

$326.38

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

2.01

PE RVU (NF)

7.7

MP RVU

0.38

Total RVU

10.09

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

NCCI bundling edits

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Billing tips

Document the medical necessity for the delay technique specifically, explaining why immediate definitive flap transfer would risk failure
Impact: Prevents medical necessity denials that account for approximately 35-40% of initial rejections for this code; a single denial costs $326.38 in lost revenue plus appeal costs
Bill in the non-facility setting when performed in ASC or office-based surgical suite to capture the higher $326.38 rate versus $208.31 facility rate
Impact: Increases reimbursement by $118.07 (56% higher) per procedure when appropriate setting is documented and billed correctly
Use modifier 58 proactively when billing the subsequent definitive flap transfer (typically CPT 15734-15738 range) within the 90-day global period
Impact: Ensures full payment for the planned second stage; prevents automatic denial of $800-2000+ for the definitive procedure being rejected as included in global period
Verify the exact anatomic location qualifies as 'trunk' per CPT guidelines (excludes arms, legs, hands, feet, genitalia, scalp) before coding
Impact: Incorrect anatomic assignment can result in downcoding or denial; trunk includes chest, abdomen, back, buttocks, and inguinal areas only
Coordinate with the surgeon to photograph the flap at delay stage and document flap dimensions in operative note
Impact: Photographic documentation strengthens appeals and reduces audit vulnerability; dimension documentation supports medical necessity and prevents requests for medical records
Consider bundling analysis if other integumentary procedures are performed same day; delay flaps typically stand alone but verify with NCCI edits

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 15600 in 2025?

The 2025 Medicare national average reimbursement for CPT 15600 is $326.38 in the non-facility setting and $208.31 in the facility setting. The total RVU is 10.09 with a work RVU of 2.01. These rates are from the CMS Physician Fee Schedule released December 23, 2024.

How long should I wait between the delay flap (15600) and the definitive transfer procedure?

The typical interval between delay flap and definitive transfer is 1-3 weeks, most commonly 2 weeks. This allows sufficient time for the flap to develop enhanced vascularity through its pedicle base. The specific timing should be documented in the operative note and depends on clinical factors such as flap size, tissue quality, and patient vascular status.

Can I bill CPT 15600 and the definitive flap transfer code on the same day?

No, CPT 15600 is specifically a delay procedure performed as a separate first stage. The definitive flap transfer is coded separately (typically 15734-15738 for trunk flaps) and performed 1-3 weeks later. Billing both on the same date would be incorrect coding and subject to denial as the delay technique requires a waiting period by definition.

What modifier do I use when billing the second-stage flap transfer after 15600?

Use modifier 58 (Staged or Related Procedure) when billing the definitive flap transfer procedure that follows CPT 15600 within the 90-day global period. This modifier indicates the second procedure was planned prospectively at the time of the delay flap and should be reimbursed separately despite occurring during the global period.

What anatomic areas are included in trunk for CPT 15600?

Trunk includes the chest (anterior and posterior thorax), abdomen, back, buttocks, and inguinal regions. It specifically excludes the arms, legs, hands, feet, scalp, face, neck, and genitalia, which have separate delay flap codes. Documentation must clearly identify the anatomic location to support correct code assignment.

Why would a surgeon perform a delay flap instead of immediate flap transfer?

Delay flaps are used when immediate definitive transfer carries high risk of flap necrosis due to inadequate blood supply. Common indications include very large flaps, previously irradiated tissue, compromised vascularity from diabetes or smoking, re-operative fields with scarring, or flaps with unfavorable length-to-width ratios. The delay allows the flap to develop enhanced circulation through its pedicle base.

Is CPT 15600 bilateral or unilateral?

CPT 15600 is inherently unilateral and describes a delay flap at one trunk location. If delay flaps are performed on both sides of the trunk (bilateral) in the same operative session, append modifier 50 for bilateral procedure, which typically increases reimbursement to 150% of the unilateral rate. Document both sites clearly in the operative note.