Gary's cancer and chemo fund

My dad was diagnosed with stage 4 colon cancer last February, he then has undergone a years worth of chemo treatment in 6 months, which ended in November. He went back 3 months after for a check up and was told everything looked great and was clear on his scans. Then he went for another appointment in May and had a colonoscopy, and CT scan, the CT scan showed something so they did a PET scan, they are 80% sure it's back already. Unfortunately.. And given the type of cancer he has, it may not be treatable. When he was first diagnosed he did not have health insurance and because it was so sudden and urgent he had a surgery and hospital stay that resulted in a major bill.. He now has insurance but they are giving him a hard time on what they will cover.. Any help at all would be greatly appreciated. He at the moment isn't able to work like he wants or needs to because of this new tumor.. It's causing him a great deal of pain and struggles everyday.. Thank you ahead of time for any that can help. We appreciate every one of you.