More or less adding on to the above:
There is probably no way to come out unscathed from any confrontation, and so to an extent you'll have to decide if points won are worth the additional BS that anyone senior to you can dish out (true in the military and out). You can certainly refuse to do anything medically (prescribe medications, round on patients that aren't yours, what-have-you) with the argument that its not in the best interest of the patient. Obviously that has to be done within reason. What you'll get in return is micromanaging, scrutiny over everything that you do (the military - at least the Army - has a keen eye for turning known and expected complications into witch hunts, so unless you never have a complication you should expect at some point to have risk management "invited" to speak with you. I've even seen providers lose privelages for complications that were both known and statistically reasonable...) Additionally, your senior may elect to divert all the crap to your office door in terms of additional paperwork and the bottom-of-the-barrel patients.
If the guy is otherwise a decent provider, I think you're SOL unless he's asking you to do something that isn't good for the patient. For example, if someone senior to me expected me to see all of his post-op patients, I would argue that he needs to see his own post-ops unless he is actually unable, because that is best for the patient. If the guy is a crap provider, then you can always turn the risk management thing around on him. Just expect retaliation to the Nth degree, and make sure you go in extremely prepared.
The last option, of course, is to talk to the guy about your concerns. I'll assume that you have either done that already, or have a good reason to feel that he won't respond well.
