The Massachusetts Attorney General's office has announced Boston Medical Center has agreed to pay $600,000 to settle allegations it overcharged the state for emergency services provided to low-income patients. The hospital and its East Boston Neighborhood Health Center will also begin talks with the state about improving emergency services. Attorney General Martha Coakley's suit alleged Boston Medical overcharged the Massachusetts Uncompensated Care Pool for services provided at the health center from 2003 to 2006.