The insurance co. will not pay the caregiver company unless my husband, with Alzheimer's, signs a form, release of funds. Advice?

If you have his POA, you are him. They must accept your signature on his behalf IF YOU PRESENT THEM WITH A COPY OF THE POA. I've exercised POAs for two different people. Most institutions wanted me to sign:

(Whoever...first and last name) by Maggie Marshall, POA.

Just exercise your POA and be sure to include a copy of it, front to back.

Ask if they will accept a copy of the POA and a signature authorized by the POA document. I had to do this with banks and other financial institutions to get control of my parents finances.

This makes sense to me. Doctors and hospitals have to get authorization for your to allow your insurance company to pay them directly. It seems logical that caregiving providers would as well. Although I don't always remember the details, my best recollection is that we had to sign authorizations for the home care employees' company to bill Medicare and BCBSM.

You will probably have to sign for him, but sign as his POA, not individually as his wife.