Des Moines Register: More than 220,000 poor or disabled Iowans could lose access to one of the state's largest hospital-and-clinic systems because of a payment dispute with a Medicaid management company. The affected Iowans receive Medicaid via AmeriHealth Caritas, one of three companies the state hired last year to run the public health insurance program. AmeriHealth recently mailed letters warning that it has been unable to negotiate new contract terms with Mercy Health Network.