Stephen Simpson, MD
Stephen Simpson is a Psychologist provider (Psychologist) practicing in Pasadena, CA, registered in the NPPES registry with NPI 1801278148 since 2015. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1801278148 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Stephen Simpson |
| Credential | MD |
| Sex | Male |
| Practice address | Pasadena, CA, 91103 |
| Phone | 2137180256 |
| Fax | 8183017443 |
| Enumeration date | 2015-06-23 |
| Last updated in NPPES | 2015-06-23 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 103T00000X | Psychologist | Primary | PSY17653 | CA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Stephen Simpson, MD NPI: 1801278148 Taxonomy: 103T00000X (Psychologist) Address: Pasadena, CA, 91103
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1790811248 | Roberto Zarate | Individual | Clinical Psychologist | Pasadena, CA |
| 1992903918 | Liliane Arenzon | Individual | Psychiatry Physician | Pasadena, CA |
| 1790098978 | The De Brito Professional Medical Corporation | Organization | Clinical Neuropsychologist | Pasadena, CA |
| 1194198390 | Comprehensive Wellness Center, Inc. | Organization | Addiction Psychiatry Physician | Pasadena, CA |
Verify this record
Cross-check NPI 1801278148 against the authoritative CMS record: view Stephen Simpson on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2015-06-23.