Mark Kagan's medical expenses

2018 started as any other New Year for Mark Kagan - until it wasn't.  Mark was admitted to the emergency room on New Year's Day with what turned out to be an orange-sized tumor behind his eyes.  The pressure from the tumor had caused a facial stroke.  Surgery was successful; the doctors are confident they got it all.  However, full recovery will be long, and as with most major medical issues today, Mark will incur significant costs that aren't covered by his insurance including high deductibles.  There but for the grace of God could be any of us these days.  Please help our friend and colleague with what you can.  Thanks!