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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Steven J Gustaveson, MD

Internal Medicine Physician in Madera, CA · enumerated 2006.

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

National Provider Identifier

1598777559

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Registry record

Entity type Individual (Type 1)
Name Steven J Gustaveson
Credential MD
Sex Male
Practice address 1111 W 4th St, Bldg B, Madera, CA, 93637
Phone (559) 662-2705
Fax (559) 673-1588
Enumeration date Aug 11, 2006
Last updated in NPPES Mar 22, 2011

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A49993 (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
GR0068140 Medicaid CA -
1699004044 Medicaid CA -
LAB13493F Other CA MEDICAID LAB NUMBER

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 NPI 1598777559 active?
Yes, as of the latest NPPES snapshot, NPI 1598777559 is active (record last updated 2011-03-22).
How do I verify Steven Gustaveson's NPI record?
Cross-check NPI 1598777559 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-22.