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Vital Signs

Perspectives on Healthcare IT, clinical informatics, emerging technology, and life at the intersection of nursing and enterprise systems.

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October 23, 2026 · Certification Prep, Healthcare IT, HIMSS Word of The Day, Interoperability and Standards

HIMSS Word of the Day #160: Unique Patient Identifier (UPI)

A unique patient identifier (UPI) is a value permanently assigned to one person and used to identify them across the healthcare system. This post explains why the United States has no national patient identifier, the long-standing funding restriction, how organizations match patients today, the safety and interoperability risks of mismatches, and how nurses help get identification right.

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