Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Charles Gustafson, M.D.

Obstetrics & Gynecology Physician in Ventura, CA · enumerated 2006 · practices at Ventura County Obstetric and Gynecologic Medical Group, Inc.

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

National Provider Identifier

1003836016

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Registry record

Entity type Individual (Type 1)

Name John Charles Gustafson

Credential M.D.

Sex Male

Practice address 2795 Loma Vista Rd, Ventura, CA, 93003

Phone (805) 643-8695

Fax (805) 643-2087

Enumeration date Jul 20, 2006

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License G36782 (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
RHM08608F	Medicaid	CA	-
ZZZ82842Z	Medicaid	CA	-
RHM08609F	Medicaid	CA	-
050394	Other	CA	BLUE CROSS
RHM18553H	Medicaid	CA	-
ZZT40394F	Medicaid	CA	-
951683892	Other	CA	OTHER INSURANCE
953152550	Other	CA	OTHER INSURANCE

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

How do I verify John Gustafson's NPI record?

Cross-check NPI 1003836016 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1003836016 active?

Yes, as of the latest NPPES snapshot, NPI 1003836016 is active (record last updated 2007-07-09).

Other providers at this practice address

Browse all →

Richard Reisman Obstetrics & Gynecology Physician · Ventura, CA NPI 1457367815 Ventura County Obstetric and Gynecologic Medical Group, Inc Obstetrics & Gynecology Physician · Ventura, CA NPI 1083743652 Jill Hall Gynecology Physician · Ventura, CA NPI 1265607204 Anne Chezar-Garnett Advanced Practice Midwife · Ventura, CA NPI 1841547122

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.