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  1. Fonteum
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  3. Glossary
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  5. UEI
Healthcare Data GlossaryRegulatory

UEI: Definition and Healthcare Context

Full name: Unique Entity Identifier

The Unique Entity Identifier (UEI) is a 12-character alphanumeric identifier assigned by the U.S. General Services Administration through SAM.gov to every organization registered to do business with, or be tracked by, the federal government. The UEI replaced the DUNS number in April 2022 as the official entity identifier across federal award systems. In health care exclusion data, the UEI identifies organizational entities on the SAM.gov exclusions file, complementing the NPI, which enumerates individual and organizational providers, and the CMS Certification Number, which identifies certified facilities.

Last updated: 2026-06-17Reviewed by: Dr. Jennifer Montecillo, MD — Gullas College of Medicine, 2019. Non-practicing medical reviewer.

How it’s used

  • SAM.gov Exclusions: organizational exclusion records are keyed to the entity's UEI, identifying barred companies as distinct from barred individuals.
  • Federal award systems use the UEI as the single entity key across registration, contracts, and exclusion data.
  • Fonteum joins UEI-keyed entity exclusions to NPI- and CCN-keyed provider records during entity resolution, so an organization barred federally surfaces against its health care identities.

Frequently asked questions

What is a UEI?
A UEI (Unique Entity Identifier) is a 12-character alphanumeric ID assigned by the GSA through SAM.gov to organizations registered with the federal government for awards and tracking.
What replaced the DUNS number?
The Unique Entity Identifier replaced the DUNS number in April 2022 as the official entity identifier across federal award and registration systems on SAM.gov.
How is a UEI different from an NPI?
A UEI identifies any organization registered with the federal government. An NPI identifies HIPAA-covered health care providers. Exclusion data uses the UEI for entities and the NPI for individual providers.

Related terms

  • Exclusion Screening
  • NPI Number
  • CCN
  • Entity Resolution
  • LEIE

Explore in Fonteum

How Fonteum sources, resolves, and publishes data tied to this term.

  • DataState and federal exclusion datasets
  • Use caseExclusion & sanctions screening
  • Use caseScreening workflow for compliance teams

Authoritative sources

  • SAM.gov: Unique Entity Identifier (UEI)↗
  • SAM.gov: federal exclusions↗
← All glossary terms

The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities
15.7Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities
5Mgraph edgesSource-attested relationships between entities
44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
35dataset pagesCitable, downloadable /data catalog pages
65reproducible studiesEach shipping the SQL behind its figures

Built on the authoritative federal record

The primary sources, named on every page.

These are the federal agencies whose public datasets Fonteum ingests and attributes — the issuing authorities, not customers or partners. Every figure on the site links back to one of them.

  • CMS
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  • NLM
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  • Census
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  • BEA

See the full source registry, with license and refresh cadence for each →

Reproducible by design

Every figure traces to its federal source.

14-tuple provenance

Every rendered fact ties to a source URL, dataset ID, snapshot date, row key, and SHA-256 — the full chain-of-custody record.

Reproducible SQL

Each study ships the exact query behind its figures, run against the cited federal snapshot. Re-run it yourself.

Daily reconciliation

Published counts are reconciled against the upstream federal datasets on a daily cadence, with drift logged.

Named medical review

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

Read the full provenance and attestation methodology →

Two doors

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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

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