Chief medical officer was a rank given to the senior member of the medical staff assigned to a starship or planetary installation. The chief medical officer was usually a member of the command staff, and had absolute authority over medical matters.
Captain Jos Vondar was chief medical officer at Republic Mobile Surgical Unit 7.
Doctor Zahara Cody was the chief medical officer of the Purge during the Galactic Civil War.
The Gotal Tuuve was the chief medical officer of the Quarantine Enforcement Cruiser Lycoming during the Death Seed outbreak of 14 ABY.