RecruitingDevice studyLongitudinal Real-world Clinical Outcomes Study on Symplicity Renal DenervationThis observational study will assess the long-term effectiveness of the RDN procedure for lowering blood pressure in Medicare patients with uncontrolled hypertension. This research will be conducted using de-identified electronic health records (EHR) and administrative health insurance claims data. Patients are enrolled through the submission of claims or encounter data to CMS.