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Introduction: Continuity of care by family physicians in primary care settings may play a role in reducing health resource utilization and improving clinical outcomes and satisfaction of patients with chronic obstructive pulmonary disease. Clear evidence on the impact of continuity of care will support clinical programing and integration of services across health settings. Methods: The association between continuity of care and unplanned health service utilization in persons with a diagnosis of chronic obstructive pulmonary disease in a rural region in Ontario, Canada was evaluated. A retrospective cohort study was conducted using population-level health administrative data. The main exposure variable was continuity of care. Results: A continuity of care index was calculated for patients with at least five visits to a healthcare provider during the 5-year follow-up period (n = 40,033). Higher continuity of care (n = 20,008) and lower continuity of care (n = 20,025), based on the median continuity of care score were calculated. Patients with lower continuity of care had an increased adjusted relative risk of 2.12 (2.08, 2.33) of an emergency department visit, 2.81 (2.72, 2.9) risk of hospitalization, and 3.52 (3.24, 3.82) of being readmitted to hospital compared to those with higher continuity of care. Discussion: An association between continuity of care and unplanned health services utilization, where a lower use of unplanned health services was observed in the cohort of patients with chronic obstructive pulmonary disease experiencing higher continuity of care. Continuity of care makes philosophical and social sense in that care is provided by a known provider to a known patient and unnecessary investigations can be avoided. [ABSTRACT FROM AUTHOR]