HL7 Terminology (THO)
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HL7 Terminology (THO), published by HL7 International - Vocabulary Work Group. This guide is not an authorized publication; it is the continuous build for version 7.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/UTG/ and changes regularly. See the Directory of published versions

Unique Ingredient Identifier (UNII) Metadata Record

Metadata Record Information Version 20251031
Maintained By HL7 Terminology Services Management Group (TSMG)
Last Updated Date 31 October 2025
Responsible Organizations U.S. Food and Drug Administration (FDA) Roles
  • Code System Owner
  • Code System Maintainer (Steward)
  • Code System Publisher
Website https://www.fda.gov/
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Code System Names Formal name Unique Ingredient Identifier (UNII)
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Code System Technical Identifiers Identification Record
TSMG-endorsed URI http://fdasis.nlm.nih.gov
TSMG-endorsed OID 2.16.840.1.113883.4.9
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Description
A UNII is a non-proprietary, free, unique, unambiguous, nonsemantic, alphanumeric identifier based on a substance's molecular structure and/or descriptive information. UNII identifiers are generated based on scientific identity characteristics using ISO 11238 data elements. UNII availability does not imply any regulatory review or approval. Synonyms and mappings are based on the best public information available at the time of publication.
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Code System Copyright, Intellectual Property and Licensing Copyright Statement
Unless otherwise noted, the contents of the FDA website (www.fda.gov) — both text and graphics — are not copyrighted. They are in the public domain and may be republished, reprinted and otherwise used freely by anyone without the need to obtain permission from FDA. Credit to the U.S. Food and Drug Administration as the source is appreciated but not required.
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