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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas Edwin Nielsen, M.D.

Phlebology Physician in Bloomington, IL · enumerated 2006 · practices at The Vein Specialists, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1871521757

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Registry record

Entity type Individual (Type 1)
Name Dr. Thomas Edwin Nielsen
Credential M.D.
Sex Male
Practice address 3302 Gerig Dr, Suite 100, Bloomington, IL, 61704
Phone (309) 862-4000
Fax (309) 862-4055
Enumeration date Jun 29, 2006
Last updated in NPPES Mar 25, 2014

Taxonomy & licenses

202K00000X Phlebology Physician Allopathic & Osteopathic Physicians · License 036065215 (IL) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
05721369 Other IL BC/BS

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is NPI 1871521757 active?
Yes, as of the latest NPPES snapshot, NPI 1871521757 is active (record last updated 2014-03-25).
How do I verify Thomas Nielsen's NPI record?
Cross-check NPI 1871521757 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-03-25.