Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory S Holst, MD

Family Medicine Physician in Eureka, CA · enumerated 2006.

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

National Provider Identifier

1881601615

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory S Holst

Credential MD

Sex Male

Practice address 2675 Harris Street, Eureka, CA, 95503

Phone (707) 443-8335

Fax (707) 443-7327

Enumeration date Aug 2, 2006

Last updated in NPPES Feb 15, 2021

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License C52586 (CA) 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
H0615462	Other	CO	BCBS PROV #
080182153	Other	CO	RR MCR PROV #
84601413802	Other	CO	PACIFICARE PROV #
84601413812	Medicaid	NE	-
01355239	Medicaid	CO	-
846014138009	Other	CO	ROCKY MTN HMO PROV #

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

Where does Gregory Holst practice?

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

What is the NPI number for Gregory Holst?

The National Provider Identifier (NPI) for Gregory Holst is 1881601615, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Steven Korenstein Family Medicine Physician · Eureka, CA NPI 1568776318

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-15.