This study examined the roles and effectiveness of nurse partner-provided diabetes self-management (DSM) support in five rural primary care clinics. There were two to nine providers and one nurse partner in each clinic; nurses were licensed practical nurses (LPNs) in all but one clinic. Interviews with providers and observations of patient interactions assessed nurse roles, clinic processes, and communication patterns. Using immersion-crystallization methods, three major themes explained nurse partner role variation: "gatekeeper" role of providers, compression of time and space within clinic work flow, and nurses' educational background and experience. While nurses' education and experience were important, clinics where providers facilitated nurse participation in DSM support through focused communication and commitment of time and space most effectively integrated DSM support into their practice. Some quantitative measures improved; notably glycated hemoglobin level and patients' frequency of blood glucose measurement. Study findings provide guidance on using nurses in primary care clinics to provide DSM.