The largest diameter is the size you use, so in your example it would be 3 however do not forget to include the margins.. the codes go by excised diameter not lesion diameter so the physician should be documented either the lesion size and margins or the excised dimensions. so if her said the lesion was 1.5 x 3cm with 1.5cm margins then you double the margin and add to the largest diameter for a total of 4.5 cm. Ihope that helps and does not confuse!
Debra Mitchell, MSPH, CPC-H
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