The debate around a U.S. unique health identifier has resurfaced recently. There have been petitions (MyHealthID), competitions (CHIME), and numerous blogs and articles on the relative merits and issues associated with a national health identifier. I choose not to rehash old arguments (“the privacy! the cost! the ethics!”) but instead offer a perspective from a clinician, researcher, and consumer of health services in a health system with a mature, entrenched national health identifier: New Zealand……more