Pulmonary Hypertension Research and Diagnosis Act of 2013 - Directs the Secretary of Health and Human Services (HHS) to establish an Interagency Pulmonary Hypertension Coordinating Committee to make recommendations on, and coordinate, all efforts within HHS concerning pulmonary hypertension.

Requires the Committee to: (1) develop and update annually a summary of pulmonary hypertension advances in medical research and treatment development and improvement, early and accurate diagnosis, appropriate and timely intervention, transplantation, and access to care and therapies for patients; (2) monitor federal activities respecting pulmonary hypertension; (3) make recommendations regarding appropriate changes to such activities as well as stakeholder participation in decisions relating to pulmonary hypertension; and (4) develop and update annually a comprehensive strategic plan to cooperatively improve health outcomes for pulmonary hypertension patients.