Will I be responsible for the full pay to the NH during the Medicaid Pending Period? It has been three months and Dad has been denied.

Dad entered the NH after being released from the Hospital and he needed 24 hour care. He has accumulated three months of charges as the Medicaid application was denied because I left three thousand in his account. Now the bill is $15,000 will Medicaid pick this up or am I, daughter and POA just responsible for the patient pay. My dad had Aid and Attendance with the Veterans and frankly I am considering which is better Medicaid or the VA. Certainly home health aides are less expensive than the 5000 NH pay if not approved for something I don't know about and he did not have a supplemental so he went on full daily pay after the 20 day Medicare ended.