CENTRAL ISLIP, N.Y. — A medical biller has been sentenced to 12 years in federal prison after being convicted in a massive insurance fraud scheme that involved posing as an NBA player, a lawyer and and other patients to harangue the companies for payments that weren’t actually due, prosecutors said.U.S. District Judge Joanna Seybert called Matthew James’ actions “inexcusable” as she sentenced him Friday in Central Islip, Newsday reported.“To ruin people’s reputations, to do all …