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CPT 15121: Split-Thickness Autograft, Additional 100 sq cm
CPT code 15121 designates an add-on split-thickness autograft for an additional area of up to 100 square centimeters, or up to 1% of body surface for infants and children. The code applies when reconstructive skin grafting extends beyond the primary grafted area and is used across a range of anatomic sites including the face, scalp, eyelids, mouth, neck, ears, orbits, genitalia, hands, feet, and multiple digits. Nationally, this code is important for accurately capturing incremental operative work and resources associated with additional graft placement in reconstructive and burn surgeries.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for use of the code, typical sites of service, and the types of diagnoses that commonly justify grafting (for example, burns, pressure ulcers, and open wounds). The publication outlines how the code relates to primary autograft procedures and associated coding considerations, and it highlights common billing modifiers and related CPT codes for comprehensive coding alignment.
This summary serves providers, coders, and revenue cycle professionals seeking a national-level reference for when CPT code 15121 is applicable, what clinical situations prompt its use, and which major payers commonly cover these services.
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Billing Code Overview
CPT code 15121 describes a split-thickness autograft procedure for reconstruction on the face, scalp, eyelids, mouth, neck, ears, orbits, genitalia, hands, feet, and/or multiple digits. This code specifically represents the excision and placement of an additional graft area of 100 square centimeters or less, or 1% of body area for an infant or child, billed as an add-on to a primary graft procedure.
Service Type: Surgical skin grafting (split-thickness autograft), additional graft area
Typical Site of Service: Operating room or procedure suite, commonly performed by surgical or plastic surgery teams for reconstructive coverage of wounds, burns, or soft-tissue defects on the head, neck, extremities, genitalia, or digits.
National Reimbursement Benchmarks
Nationally, Medicare averages $227.70 for CPT 15121 while BUCA (average commercial) averages $1,503.30, indicating BUCA mean rates sit roughly $1,275.60 above Medicare. This gap highlights substantial upward pressure in some commercial contracts compared with the Medicare baseline, with BUCA clearly representing a higher-cost commercial benchmark versus the federal program.
Rate dispersion (P75 minus P25) varies materially across payers: Blue Cross Blue Shield shows the widest interquartile spread at $3,059.10 ($3,837.90 - $788.10), followed by BUCA with $1,814.10 ($2,327.50 - $513.40). UnitedHealth Group and Cigna have moderate spreads of $1,936.00 ($396.80 - $203.20) and $179.40 ($359.70 - $180.30) respectively, while Aetna is the tightest at $126.00 ($184.00 - $58.20). These dispersion differences reflect how concentrated or variable commercial reimbursement can be across payers.