Fan Casting Back-Alley Doctor in Sort by Tropes

A surgeon with medical credentials that are... less than ideal. This could be for any number of reasons, from the surgeon having his license revoked, only having done half the courses, to actually being denied one in the first place, or (if you're lucky) he got it in the wrong country. One or more patients in the past may have died on his operating table due to improper procedures, mistakes, or lack of proper sanitation. Chances are they still do. Even so, he still gets a lot of business, simply because he never asks any questions. He does, however, expect you to do the same, and he expects to be paid in cash.