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. ... St. Mary Mercy Livonia. SMML Online PMT, 36475 Five Mile, Livonia, MI 48154 (800) 494-5797. Make a Payment. Email. Account number (Exclude Dashes & Letters ....