Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Thomas Hattenhauer, MD

Cardiovascular Disease Physician in Longview, WA · enumerated 2006.

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

National Provider Identifier

1295740702

Verified

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Registry record

Entity type Individual (Type 1)

Name Mark Thomas Hattenhauer

Credential MD

Sex Male

Practice address 1615 Delaware St, Longview, WA, 98632

Phone (360) 414-2730

Fax (360) 414-2739

Enumeration date Jul 31, 2006

Last updated in NPPES Apr 8, 2010

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License MD07556 (OR) Primary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License MD00028883 (WA) Secondary

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
8563314	Medicaid	WA	-
085084	Medicaid	OR	-

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 Mark Hattenhauer?

The National Provider Identifier (NPI) for Mark Hattenhauer is 1295740702, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Hattenhauer practice?

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

Other providers at this practice address

Browse all →

Lan Pham Internal Medicine Physician · Longview, WA NPI 1548264252 Tsz-Ming Chow Neurology Physician · Longview, WA NPI 1689679714 Lisa Evans Family Medicine Physician · Longview, WA NPI 1891790580 Lawrence Neville Neurology Physician · Longview, WA NPI 1134124639 R. Hughey Internal Medicine Physician · Longview, WA NPI 1316943590 Linda Johnston Adult Health Nurse Practitioner · Longview, WA NPI 1376549337 Leena Carriere Anesthesiology Physician · Longview, WA NPI 1982600805 Michael Bartlett Family Medicine Physician · Longview, WA NPI 1356348502

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-04-08.