Yes. You should write it at John P. Doe, MD
You should put a comma before a person name if you're talking directly to them. ex- Please come here,Lily.
Do not put a space before a comma. Put one space afterthe comma.
The comma goes after.
no but sometimes after the name
no. if but before is a sentence on its on and after but is a sentence on its own then put a comma before but.
it depends upon the type of sentence you write so it depends,&before a degree we never put a ",".
You ussualy put a comma before the conjuction. On rare evernts you put the comma after.
before
Do you put a comma after the last name of a P.A. e.g. Jan Farinato, P.A. or Jan Farinato P.A.
No, you don't have to put a comma before at all.
no
no