Physician ettiquette?

In a document, what is the proper ettiquette to address or refer to a doctor? Dr. Joe Bloe or Joe Bloe, M.D.

Answer:
i'd address is to "Dr. Joe Bloe"

would you address a letter to " Joe Bloe, B.A."?
or how roughly speaking "Joe Bloe, B.S., M.S., PhD"?

just plain "Dr. whatever" is fine.
The latter...MD
The former contained by the second person, the latter surrounded by the third.
Both are good, but contained by my opinion,
Dr. Joe Bloe M.D.

is better..
if you are chitchat to him (like a letter to him) it would be Dr. Joe Bloe .. if you are chitchat about him after Joe Bloe, M.D.
In writing, the latter.
If you are writing to him I'd say Dr. Joe Bloe . If you are writing something like him, then Joe Bloe, M.D.

I agree next to "The former in the second party, the latter in the third" as in good health.

It also depends on who the audience is when writing about him though. There are copious different types of Dr. (mathematician, music theorist, chemist, ...). The M.D. is more descriptive.
Either. You lately shouldn't do both together. (You'll note, though, that chiropractic office often hold "Dr. Joe Blow, D.C." on them, but that's them.
you should never do DR. Joe Bloe, M.D. It is just redundant.

when address him or to someone that knows him, Dr. Joe Bloe is proper.

When chitchat about him to standard poputlation, then Joe Bloe, M.D. is proper. There are lots of different Doctors (MD, DO, DDS, OD, PhD, etc...)
If you are writing a epistle, it is like this:

Joseph X. Bloe, M.D.
1111 Main Street
Anywhere, TX

Dear Dr. Bloe,
(etc.)

Or, Dr. & Mrs. Joseph Bloe; Dear Dr. and Mrs. Bloe
Drs. Joseph and Caroline Bloe; Dear Drs. Bloe
Mr. Henry Jones and Dr. Josephine Bloe; (I dunno this one. Dear Hank and Josie?)
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