Clinical Context
A patient with a localized dermatologic or soft tissue defect presents for a surgical repair where a skin graft material measured and billed by surface area in square centimeters is required as an adjunct to the primary procedure. Typical scenarios include repair of traumatic avulsion injuries, non-healing wounds after excision of skin cancer, or reconstruction following Mohs micrographic surgery. The primary surgeon documents the graft area in square centimeters in the operative note and the facility or provider bills the add-on HCPCS Level II code Q4329 per square centimeter in addition to the primary procedure.
Workflow:
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Preoperative evaluation by the surgeon with diagnosis and planned reconstruction documented.
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Intraoperative measurement of the grafted area in square centimeters recorded in the operative report.
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Primary procedure (e.g., excision, flap, or preparation of wound bed) is reported with the appropriate CPT code; Q4329 is added per square centimeter for the graft material as an add-on charge.
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Appropriate modifier(s) are appended when indicated (for example, to indicate multiple surgeons, reduced services, or unusual procedural circumstances).
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Billing staff submits the primary procedure CPT along with the add-on code Q4329 and documents the exact number of square centimeters billed in the claim line or supporting documentation.
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|
14040 | Adjacent tissue transfer or rearrangement, forehead, cheeks, eyelids, nose, lips and/or chin; defect 10 sq cm or less | May be used when local tissue rearrangement is the primary reconstructive technique; Q4329 would be billed additionally if graft material per sq cm is required. |
15271 | Split-thickness autograft, trunk; first 100 sq cm or less, or 1% of body surface of infants and children | Common primary grafting CPT for autografts; Q4329 is an add-on per square centimeter for graft material when applicable.
15275 | Split-thickness autograft, lower extremity, over 300 sq cm | Used for larger graft harvests; Q4329 may be billed per sq cm for additional graft material charges if payer policy permits.
15730 | Forehead flap, with or without graft; local flaps and/or graft when used for nasal reconstruction | Used in combination with grafting in complex reconstructions; Q4329 complements billing for graft area.
17380 | Mohs micrographic technique, first stage; head, neck, hands, feet, genitalia, or trunk - including multiple stages when performed | Mohs surgery often precedes reconstruction; after tumor extirpation and staged closure, Q4329 may be billed for graft material used in reconstruction.
97602 | Removal of devitalized tissue from wound(s), selective debridement, without anesthesia; first 20 sq cm or less | Debridement frequently precedes grafting to prepare the wound bed; Q4329 may be billed subsequently for grafted area.