Dr. Thomas A Onstad, M.D.

Dr. Thomas A Onstad is a Specialist provider (Specialist) practicing in Eugene, OR, registered in the NPPES registry with NPI 1639155773 since 2005. The credential MD stands for Doctor of Medicine.

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NPI	1639155773
Entity type	Individual (Type 1)
Name	Dr. Thomas A Onstad
Credential	M.D.
Sex	Male
Practice address	923 COUNTRY CLUB RD, SUITE 100, Eugene, OR, 97401
Phone	5413431629
Fax	5414855944
Enumeration date	2005-12-20
Last updated in NPPES	2007-07-08

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
174400000X	Specialist	Primary	MD07372	OR

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
141481	Medicaid	OR	—

Copy-ready billing details

Provider: Thomas Onstad, M.D.
NPI: 1639155773
Taxonomy: 174400000X (Specialist)
Address: 923 COUNTRY CLUB RD, SUITE 100, Eugene, OR, 97401

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1194701268	James Regali	Individual	Specialist	Eugene, OR

Verify this record

Cross-check NPI 1639155773 against the authoritative CMS record: view Dr. Thomas A Onstad on the official NPPES registry .

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. Read the full guide or validate an NPI number.

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Thomas Onstad?

Thomas Onstad is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.