Dr. Thomas Miller Simpson, PH.D.
Dr. Thomas Miller Simpson is a Clinical Psychologist provider (Psychologist) practicing in Reston, VA, registered in the NPPES registry with NPI 1699784843 since 2006. The credential PHD stands for Doctor of Philosophy.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1699784843 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Thomas Miller Simpson |
| Credential | PH.D. |
| Sex | Male |
| Practice address | Reston, VA, 20190 |
| Phone | 7034357063 |
| Fax | 7034371908 |
| Enumeration date | 2006-08-05 |
| Last updated in NPPES | 2007-07-08 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 103TC0700X | Clinical Psychologist | Primary | 0810000913 | VA |
PHD — Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential
Copy-ready billing details
Provider: Thomas Simpson, PH.D. NPI: 1699784843 Taxonomy: 103TC0700X (Clinical Psychologist) Address: Reston, VA, 20190
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1881680437 | Teresa Simonson | Individual | Clinical Psychologist | Reston, VA |
| 1750465852 | Tehila Selzer-Putney | Individual | Clinical Psychologist | Reston, VA |
| 1659437994 | Cynthia Stroud | Individual | Clinical Social Worker | Reston, VA |
| 1154510717 | John Thomas | Individual | Clinical Social Worker | Reston, VA |
| 1831338557 | Lisa Snipper | Individual | Clinical Social Worker | Reston, VA |
Verify this record
Cross-check NPI 1699784843 against the authoritative CMS record: view Dr. Thomas Miller 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 2007-07-08.