Pay online with the InstaMed Patient Portal, a simple and secure way to pay any healthcare provider. Pay all of your medical bills in one place with InstaMed and create a digital wallet. ... SE SOUTHWESTERN EYE CENTER. SOUTHWESTERN EYE CENTER. MSC 621 PO BOX 52163 PHOENIX, AZ 85072-2163. SE SOUTHWESTERN EYE CENTER. SOUTHWESTERN EYE CENTER. P.O ....