Hi guys,
As Becky said if possible always confirm cover with the insurer before getting any procedure done. There might be something in the t&c's about location, consultant status, clinical indicators for a scan, whether its direct pay or pay and claim back etc that could catch you out and they are obliged to inform you correctly.
With regards to the relatively new day hospitals & centres, I've noticed VHI now cover them depending on the plan. They have added a new section into the table of benefits, breaking it down into level 1 and level 2 day hospitals. I don't think Laya or Irish Life Health cover them yet.