By Katie Kerwin McCrimmon One of Colorados largest health insurance companies has reversed itself and is now covering care for transgender patients. Kelly Costello, 32, of Denver, received stunning news last week. One day after getting a formal notice that Anthem Blue Cross and Blue Shield of Colorado would not cover chest reconstruction surgery, the company abruptly overturned its decision. Costello received a written notice that Anthem has reversed its decision and now will cover some or all of the services. Costello had paid about $8,000 in out-of-pocket expenses for the surgery he underwent in April. Costello is overjoyed. Im…