The University of Chicago Medical Center violated federal law by not providing a medical screening exam to a 78-year-old man who died last month in its emergency room, federal health officials say. The Feb. 3 death of the man led to violations of the federal Emergency Medical Treatment and Active Labor Act, according to the Centers for Medicare and Medicaid Services. Such violations, if not corrected to the agency's satisfaction, could lead to a loss of federal funding from the Medicare health insurance program.