Don’t forget bailing out hospitals etc. when people invariably default on their medical debt. On expensive ER bills that only exist because people couldn’t afford to visit a GP five years earlier and get some cheap off the shelf preventive medicine.
Also, and this really shouldn’t be underestimated: Laws concerning everything from food regulations over transportation polity to sports promotion that don’t take people’s health into account because health is a private matter. With socialised healthcare, suddenly all those new fancy bike paths have a tangible ROI in yet another public budget (not just the transportation agency’s one, that is).