I echo Michele and Linda's responses...if the patient's insurance covers breast reconstruction, and the patient is having it done for a covered diagnosis, then you have a clean claim.
Granted, this doesn't mean insurance will always process as a clean claim, but knowing what the medical policy/LCD is for each insurance being billed is half the battle, or more.
Curious to know where this question came from...the potential client, or you, trying to foresee what the client might ask?
If the client is the one asking, and asking in such a way as to indicate they are just "looking to get paid by insurance, what do I need to do to make that happen?", then be very wary.