HARRISBURG (AP) – A top aide to Gov. Tom Corbett says she’s optimistic that negotiations will be productive on the governor’s plan to use billions of federal Medicaid expansion dollars to subsidize private health insurance policies for hundreds of thousands of Pennsylvanians. Corbett’s Secretary of Planning and Policy, Jennifer Branstetter said that she was encouraged by a discussion with an official from the U.S. Centers for Medicare and Medicaid Services. Corbett had said he was frustrated with discouraging signals from federal officials. Corbett is seeking broader changes than any other state to the Medicaid expansion under the 2010 federal health care law. The federal government’s public comment period ended overnight Friday and Branstetter says she expects closed-door negotiations to begin in the next week or two.