Contrary to the hypothesis, patients seeing a cardiovascular specialist for uncontrolled hypertension were more likely to have their hypertension treatment intensified by their primary care provider. However, those seeing an unrelated specialist were less likely to have their treatment intensified. This suggests primary care providers still consider themselves responsible for hypertension management even when patients see specialists. The study analyzed over 15,000 patients and 70,000 visits from six primary care practices to determine the relationship between specialist care, patient characteristics, and likelihood of primary care providers intensifying hypertension treatment.