The provider uses a skin substitute such as an allograft or xenograft to cover a trunk, arms, and/or legs wound surface area of up to an additional 100 cm2 in a patient 10 years or older, or 1 percent of body area of infants and children under 10. He performs this add–on service for a wound 100 cm2 or larger at the same session that he covers the first 100 cm2 in patients 10 and older or covers the first 1 percent of body area in patients under 10.
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