California’s safety-net health program, Medi-Cal, is on the cusp of major changes that could rectify long-standing problems and improve health care for the state’s low-income population. Starting Jan. 1, Medi-Cal, California’s Medicaid program, will implement new standardized contracts with its 22 managed care health plans, which collectively cover 99% of enrollees. The new contracts tighten enforcement of quality measures, especially for women and children; require the health plans to report publicly on the performance of medical providers ― and in some cases other insurers ― to whom they del…