Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Walt Marquardt, MD

Interventional Cardiology Physician in Sacramento, CA · enumerated 2006.

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

National Provider Identifier

1881766962

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Registry record

Entity type Individual (Type 1)

Name Walt Marquardt

Credential MD

Sex Male

Practice address 3941 J Street, Suite 260, Sacramento, CA, 95819

Phone (916) 736-2323

Fax (916) 736-0620

Enumeration date Nov 14, 2006

Last updated in NPPES Jan 30, 2015

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License G59664 (CA) Secondary

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License G59664 (CA) Primary

207UN0901X Nuclear Cardiology Physician Allopathic & Osteopathic Physicians · License G59664 (CA) 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
00G596640	Medicaid	CA	-
GR0068230	Medicaid	CA	-
ZZZ47675Z	Other	CA	BLUE SHIELD
GR0068231	Medicaid	CA	-
ZZZ47676Z	Other	CA	BLUE SHIELD
GR0068235	Medicaid	CA	-
060033947	Other	CA	RAILROAD MEDICARE
GR0068233	Medicaid	CA	-
GR006823B	Medicaid	CA	-
ZZZ62306Z	Other	CA	BLUE SHIELD
GR0068232	Medicaid	CA	-
ZZZ47673Z	Other	CA	BLUE SHIELD

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

What specialty is Walt Marquardt?

Walt Marquardt is registered in NPPES with the primary taxonomy of Interventional Cardiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-01-30.