Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael Eric Janssen, MD

Internal Medicine Physician in Seattle, WA · enumerated 2006.

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

National Provider Identifier

1194804161

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael Eric Janssen

Credential MD

Sex Male

Practice address 5350 Tallman Ave Nw, Suite 301, Seattle, WA, 98107

Phone (206) 320-3335

Fax (206) 320-8027

Enumeration date Nov 2, 2006

Last updated in NPPES Oct 7, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License RT-1351 (NH) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License TL1017 (WY) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 13498 (NH) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD60344899 (WA) 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
1194804161	Medicaid	WY	-

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 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 Michael Janssen?

Michael Janssen is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-07.