Medicare regulators on Thursday launched a program to encourage doctors to deliver more follow-up care to patients, which they predict will save the government as much as $960 million over the next three years while providing better health care for the elderly. The Centers for Medicare and Medicaid Services proposed rules under President Barack Obama’s health-care overhaul setting out guidelines for doctors and hospitals that form “accountable care organizations” to deliver Medicare services. The change is intended to reduce the number of Medicare patients who are readmitted to the hospital because they did not receive the correct follow-up care.