CPT 15733Surgery

Musc myoq/fscq flp h&n pedcl

CPT 15733 covers surgical reconstruction of the head and neck area using muscle, myocutaneous, or fasciocutaneous flaps—tissue transferred from another body area with its own blood supply. This complex procedure is typically used to repair defects from trauma, cancer surgery, or congenital deformities.

Showing rates for

National Average

Base Medicare rate

$1,003.71

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

15.68

PE RVU (NF)

12.79

MP RVU

2.56

Total RVU

31.03

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

NCCI bundling edits

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Billing tips

Document flap type explicitly (muscle, myocutaneous, or fasciocutaneous) and specify donor site anatomic location in operative report
Impact: Prevents downcoding to simpler flap codes (15574-15576) which reimburse $300-500 less; critical for audit defense
Bill 15733 as the primary procedure when performed with ablative surgery; use modifier 62 if co-surgery arrangement with ablative surgeon
Impact: Ensures maximum reimbursement of $1003.71; incorrect sequencing can trigger modifier 51 reduction of 50% ($501.86 loss)
Separately bill microvascular anastomosis (69990) if free tissue transfer performed rather than pedicled flap
Impact: Additional reimbursement of approximately $200-300; however, verify 15733 does not include microvascular work per payer policy to avoid unbundling denials
Use modifier 22 with detailed documentation when radiation-damaged tissue, extensive scarring, or complex vascular anatomy significantly increases operative time beyond typical case
Impact: Can increase payment 20-50% ($200-500 additional) but requires peer comparison documentation showing 25%+ additional work/time
Do not separately bill donor site closure (13151-13153 or 15002-15005) as it is included in the flap harvest procedure
Impact: Prevents denials for unbundling; saves administrative costs of appeal process
Verify global period (090 days) before billing postoperative flap revisions; use modifier 58 for staged procedures or 78 for complications requiring OR return
Impact: Appropriate modifier use ensures payment for legitimate additional procedures; improper use results in 100% denial ($1003.71 loss)

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 15733 in 2025?

The 2025 Medicare national average reimbursement for CPT 15733 is $1003.71 for both facility and non-facility settings, based on 31.03 total RVUs and the conversion factor of 32.3465.

What is the difference between CPT 15733 and 15732?

CPT 15732 covers muscle, myocutaneous, or fasciocutaneous flaps for other areas (trunk, arms, legs), while 15733 is specific to head and neck locations. The anatomic site determines which code to use, with head and neck reconstruction typically carrying higher complexity due to cosmetic and functional considerations.

Can CPT 15733 be billed with microvascular anastomosis code 69990?

This depends on payer policy and whether the flap is pedicled or free. Some payers consider microvascular anastomosis inherent to free flap procedures and bundled into 15733, while others allow separate reporting. Verify specific payer guidelines and ensure documentation clearly distinguishes free tissue transfer requiring microsurgical technique.

How many RVUs is CPT code 15733 worth?

CPT 15733 has 31.03 total RVUs for 2025, consisting of 15.68 work RVUs, 12.79 practice expense RVUs, and 2.56 malpractice RVUs. Both facility and non-facility PE RVUs are identical at 12.79.

What diagnosis codes support medical necessity for CPT 15733?

Common supporting ICD-10 codes include malignant neoplasms of head/neck (C00-C14, C30-C32), traumatic defects (S01-S09), radiation necrosis (L59.8), and congenital deformities (Q18, Q67.4). Documentation must link the specific defect to the reconstruction need and explain why complex flap transfer is necessary.

Is CPT 15733 a bilateral procedure code?

CPT 15733 is not inherently bilateral, as it represents a single flap reconstruction. However, laterality modifiers (LT/RT) may be required by some payers to specify the anatomic side. If bilateral reconstructions are performed, the code may be billed twice with appropriate modifiers and documentation, though this is extremely rare for head/neck flaps.

What is the global period for CPT 15733?

CPT 15733 has a 90-day global surgical period. All routine postoperative care, including normal follow-up visits and minor complications managed in the office, are included. Significant complications requiring return to the OR need modifier 78, and staged procedures require modifier 58 for separate payment consideration.