Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jonathan Michael Claassen, MD

Anesthesiology Physician in Medford, OR · enumerated 2006.

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

National Provider Identifier

1780799114

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Registry record

Entity type Individual (Type 1)

Name Jonathan Michael Claassen

Credential MD

Sex Male

Practice address 842 E Main St, Medford, OR, 97504

Phone (541) 773-7273

Fax (541) 773-2027

Enumeration date Aug 19, 2006

Last updated in NPPES Jan 6, 2012

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License A87730 (CA) Secondary

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License MD29027 (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
00A877300	Medicaid	CA	-

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

What is the NPI number for Jonathan Claassen?

The National Provider Identifier (NPI) for Jonathan Claassen is 1780799114, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jonathan Claassen practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-01-06.