I have no definitive-from-a-book answer for you, but logic says that we send out for biopsy we don't really know for sure what the specimen is. For this reason we use lesion of uncertain behavior for checking something out. The mal/ben excision codes get sent for biopsy, but the physician typically suspects malignancy or not because he/she is choosing to remove the entire skin problem rather than check it out with the 11100 biopsy. I do know a very prestigious dermatology biller uses the same method. Hope this helps.
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