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I have a question about calculating the square cm for an adjacent tissue transfer via double apposing scalp flaps based upon the right temporal and left occipital areas, measuring 40 x 15 cm. My question is when measuring for the sq. cm of the reported excision size do you multiply or add? My CPT book looks like you would add 40 +15 cm to get 55 sq. cm. I am confused on whether I am adding this up correct. I am being told that you have to multiply and that gives me a measurement that exceeds any allowable amt I can bill.