ABSTRACT OBJECTIVE: To analyze the impact of implementing the Contrato Organizativo de Ação Pública (COAP – Public Action Organizational Contract) on the expansion of access to primary care in the states of Ceará and Mato Grosso do Sul. METHODS: We used the interrupted time series method to analyze the effect of COAP on primary care coverage (PCCov) and on avoidable hospitalization rates. To analyze the effects...