Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cynthia Sue Marske, DO

Internal Medicine Physician in Corvallis, OR · enumerated 2006.

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

National Provider Identifier

1891721023

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Registry record

Entity type Individual (Type 1)

Name Cynthia Sue Marske

Credential DO

Sex Female

Practice address 530 Nw 27th St, Corvallis, OR, 97330

Phone (541) 766-6835

Fax (541) 766-6186

Enumeration date Jun 22, 2006

Last updated in NPPES May 14, 2025

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 20A8560 (CA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License DO150418 (OR) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
500616008	Medicaid	OR	-
R164954	Other	OR	MEDICARE TPIN

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 Cynthia Marske?

Cynthia Marske 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 2025-05-14.