Having known several nurses and doctors, the difference between an LPN, RN, EMT, and doctor specialists isn’t skill level, but regulations about who can do what. And this is shifting constantly. And at higher TLs you may well employ robots to perform the grunt work (e.g. bathing patients) that used to be performed by Nurses.
For the simple approach, I would have a single medical career, and assign titles as ranks. For a more complicated approach I would think about splitting into tracks for nursing, EMed, general Practice doctor, and specialist doctor.
The only other thing is Loren's advice, which is just because there isn’t a Shoemaker career does not mean there are no shoe makers. This should be focused on PCs.