I am my father's POA. Do I have the right to make decisions for him over his wife, concerning the hospital?

If you have MEDICAL POA and your father is not in postition to make care decisions for himself...you not only have the right to decide, you have the RESPONSIBILITY to decide his health care.
IF it is a financial POA, you take care of the money

Make sure your POA extends to making medical decisions. A medical POA is not the same as a durable POA. Read the document to know what powers are extended to you and under what circumstances they take effect.

If your father is competent he can make his own decisions. Just because wife is married to him does not mean she can override what he wants. He has a right not to have her on HIPPA paperwork.

Your POA is not in effect if Dad is competent. If he rather you make his decisions than he has made it effective. I would have him sign something that you make his decisions. If a Dr says Dad can't make informed decisions, then your POA is in effect, but get that in writing. Dad could always put u on HIPPA paperwork so you can talk to Drs and Nurses.

So, the answer is your POA does override the wife if it is in effect.

Remember though, any decisions that are made should be made with her in mind. She may depend on Dad's income to pay the bills. If Dad is placed in care, marital assets are 50/50. She is entitled to be taken care of. Medicaid allows those assets to be split.

Be aware that your authority as a POA ends with his death. Are you also the Executor of his will?

If you read your PoA document it will tell you when the authority is active: either immediately upon signing or with 1 or 2 medical diagnosis of incapacity. When the criteria is met, you are the one and only person legally making decisions in his best interests if there are no other PoAs named.