CONROE, Texas (KTRK) -- Ron Barlow said he always writes down all his doctor appointments on his calendar.

When he gets his explanation of benefits, he said he lines up the dates of his visits with the charges billed to his insurance to make sure it's correct.

But when we spoke with Barlow last November, he told 13 Investigates his Medicare account was being billed by Florida-based company Sunshine Senior Solutions for medical supplies he knew nothing about.