Derek Seman had no idea he owed $1,067.88 to Allina Health for cardiac tests, or that the debt was sold to a collector called Accounts Receivable Services. Then a summons arrived in the mail last month. This mysterious company wasn't going to be patient. "I didn't even know they could take you to court for medical debt," he said. Turns out, it was still Allina. The Minneapolis-based health ...