U.S. Military Doctor
Ranks/Locations
(Modern Era)

U.S. Army

Line Unit Surgeons

Rank

Location

Captain

Battalion/Squadron Surgeon

Major

Brigade Surgeon

Lt. Colonel

Division Surgeon

Colonel

Corps/Higher Surgeon

Hospital Commanders

Rank

Unit Commanded

Captain
or
Major

Clinic (Small)

Lt. Colonel
or
Colonel

Clinic subordinate to Major Garrison or Medical Center

Lt. Colonel

Forward Surgical Team

Colonel

Combat Support Hospital

Colonel

Major Garrison Hospital/Clinic

Colonel
or
Brigadier General

Medical Center

Reference:
Ace of Spaces Comment Thread comment by “Rank is Rank, Doc is a MOS”. (LINK)

NOTE: I know that this is not exactly the highest quality source from which to base things upon, but it will have to do until I can uncover more detail on rank assignments for medical officers in the U.S. Army.