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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Stephen Simpson, MD

Psychologist in Pasadena, CA · enumerated 2015.

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

National Provider Identifier

1801278148

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Registry record

Entity type Individual (Type 1)
Name Stephen Simpson
Credential MD
Sex Male
Practice address Pasadena, CA, 91103
Phone (213) 718-0256
Fax (818) 301-7443
Enumeration date Jun 23, 2015
Last updated in NPPES Jun 23, 2015

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY17653 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Stephen Simpson's NPI record?
Cross-check NPI 1801278148 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1801278148 active?
Yes, as of the latest NPPES snapshot, NPI 1801278148 is active (record last updated 2015-06-23).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-06-23.