Pay out of pocket to see a GI doctor. They can't turn you away if you're willing to pay. I would imagine a consult would cost you between 200 and 500 dollars. Get a prescript
ion for the medication he needs. If it is prednisone, that probably won't cost much but he most likely will need 5asa meds to maintain his remission and they are expensive. Fortunately, Asacol is made by P&G and they have an incredible Patient Assistance program which would make his medication free.
Check out this link:
http://www.pgpharma.com/patient_assistance.shtml
You can call them for more info.
I am not sure how severe his UC is. Has he ever had a colonoscopy? It is helpful to get biopsies, I imagine he had them before his diagnosis. I managed to get a free colonoscopy through a clinical trial. Clinical trials are a good way to get free doctors appointments and medication. Some of them are for well known drugs. You should look into it.
He may also need rectal meds. A lot of the manfacturers of these medications have patient assistance programs where you can get the drugs for next to nothing if you're income is below a certain level.