Hospital & Hospice. Can I still be held liable for funds not paid by his health insurance?

So, my father was discharged from a Palliative care unit in a hospital to another Hospital with a Hospice Unit.

As the Health Care Proxy holder I signed many documents related to insurance and medical information, I was asked to sign a financial disclosure for my father. However when I questioned the issue of being his guarantor 3x, each time the admission Representative indicated I would not be held responsible for any fees as the disclosure indicates ‘Patient’s Resources’. Any one has similar experienced? Can I still be held liable for funds not paid by his health insurance carries like Medicare, Blue Cross/Blue Shield?