you can't force it. you can show him this:

for months my dad's local ent and small hospital system bounced him around using up the time where his cancer could have been curable. by the time we got him to to a CCC (comp cancer center) his cancer was only treatable.

he's likely afraid, doesn't want the travel, doesn't want to put others out, all/any of this. bottom line, and as Charm our patron saint of all things said point-blank told me early on, a CCC is where you go for this type of cancer--and my opinion, ANY cancer.

best wishes!