Noting the language you reference, physicians, doctors, etc. very definitely do not fall under the heading of professional service provider or the slang reference, "gatekeeper." This group is made up of people who have funds in your bank that, according to your own records, do not belong to them. They are not automatically high risk, they are simply "subject to expanded examination overview;" e.g. if examiners ask you for a list of these customers you should be able to provide it.
Examples would be attorneys who have "trust" or IOLTA accounts, CPAs with "impound" funds, realtors with escrow funds, auction houses with sale proceeds, etc. In essence, you really have no idea who the money in these accounts belong to, so you darn well better know who it is that's holding the purse strings.
Being a doctor or a lawyer has little (perhaps nothing) to do with a high risk classification. The nature of the person's practice and receipts would have everything to do with it.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.