It would depend on what powers you hold as your father's attorney in fact. Confidentiality laws may limit or require the company to approach your father first.
The insurance company may be seeking information to allow them to recognize the Power of Attorney. For further assistance, contact an attorney who specializes in estate planning.
If the insurance company policy states that medical documents are necessary under the policy yes they can require it. Your being power of attorney doesn't affect that.
If you are your father's agent, then you have the right to sign on his behalf. Beyond that, more information is needed regarding what they are seeking.
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