Tammy,
I am a Social Security Disability Examiner. My mother in law is stage 4 pancreatic, liver with hospice care. My husband and I are VERY close to her and are dealing with it as best as we can, although we currently live 400 miles away from her.
I understand your father is a veteran and receives treatment from the VA. I highly suggest he apply for SSA disability. He needs to do that at his local social security office or online. He also needs to apply at your county departement of social services for medicaid. One examiner will handle his Medicaid AND his diability cases and the same decision will be made for both - approved or denied. If he's worked in the past 4 years but no longer does, he may qualify for federal disability (based on what he payed into the system over the years) AND SSI which is state disability (based on income and resources). Medicaid is also based on income and resources.
In order to be approved, he must have a biospy done and a pathology report. If you can obtain a copy of these, you can include it when he applies and it will speed up the process (I highly suggest this,) otherwise, the examiner will have to request his records and sometimes this can be a lengthy process. The VA is usually pretty good about sending in medical evidence so either way is fine.
My mother in law was approved for Medicaid and Disability within weeks after she applied. She also has no insurance and is, in the best way to put it, completely broke. She hasn't worked in years! Medicaid and Social Security have been a great help.
I wish you and your father the best of luck!