UEI Definition
The Unique Entity Identifier. A 12-character alphanumeric code assigned by SAM.gov to verify and identify corporate entities contracting directly with the U.S. federal government.
Related Guides & Tools
- U.S. Federal Contracting Identifiers: DUNS, UEI, and CAGE Guide — A comprehensive reference detailing the required structural identifiers needed to transact with the U.S. federal government.
- The DUNS to UEI Transition: Key Information for Contractors — Explains the transition from the proprietary D&B DUNS identifier to the GSA-owned Unique Entity Identifier (UEI) on SAM.gov.
- SIC ↔ NAICS Concordance Crosswalk — Search and map old SIC codes to modern formats.