Three years ago, Mason Lester, a rambunctious toddler, tumbled off his family's porch and broke his wrist. His mother, nine months pregnant, rushed him to a nearby hospital, where she made a confounding discovery: Their health insurance had vanished.
Alarmed, Katie Lester called the Tennessee Medicaid agency, TennCare, which had covered her during a prior pregnancy and insured Mason since the day he was born.
