MEDICA

[Martin Moser]

Here we go:

'Legionary physicians were considered all to be of equal rank, had no immediate medical superiors and were subordinate only to their camp commander (praefectus castrorum), or in his absence, the tribunes of the legion. It was their task to supervise the food, clothing, encampment and general hygiene of the troops and to run the camp hospital.'
http://www.ospreypublishing.com/content2.php/cid=219

Battlefield medicine - The Ancient World 2000 BC-AD 500
by Ian McCulloch

Jim, thanks for digging it up. However, I must say that I find this doubtful and would like to see what sources it builds on. Reading Davies, Nutton and other established scholars on this field (see e.g. my list above) suggests that much is unclear with respect to what medical title meant what, what were the numbers of medical doctors and other medical personel with the army and how the army's medical service was structured exactly.