Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Larissa Ann Thomas, M.D.

Family Medicine Physician in La Grande, OR · enumerated 2012 · practices at Eastern Oregon Diagnostic Imaging, Inc.

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

National Provider Identifier

1720344393

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Registry record

Entity type Individual (Type 1)

Name Larissa Ann Thomas

Credential M.D.

Sex Female

Practice address 2011 4th St, La Grande, OR, 97850

Phone (541) 963-4139

Fax (541) 429-6612

Enumeration date Apr 7, 2012

Last updated in NPPES Dec 30, 2025

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License MD168475 (OR) 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
R184141	Other	-	MEDICARE PTAN PART A
R184162	Other	-	MEDICARE PTAN - PART B

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 → Validate an NPI →

Frequently asked questions

Where does Larissa Thomas practice?

The practice location on file with NPPES is in La Grande, OR. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Larissa Thomas?

The National Provider Identifier (NPI) for Larissa Thomas is 1720344393, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-30.