Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Donald Rex Simpson, MD, PHD

Individual provider Specialist · NPI 1699053397

Dr. Donald Rex Simpson, MD, PHD is a Specialist in Northridge, California. Licensed in California. Registered with an NPI since 2011.

Licensed in
CA
In the registry since
2011
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

17425 Parthenia St
Northridge, CA 91325-3240
Phone: (818) 298-1442
Fax: (818) 775-1176
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Specialties & licences

Specialist (primary) Taxonomy 174400000X · Licence G44436 (CA)
Cytopathology Physician Taxonomy 207ZC0500X · Licence G44436 (CA)
Anatomic Pathology & Clinical Pathology Physician Taxonomy 207ZP0102X · Licence G44436 (CA)

Record details

NPI number1699053397
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedJuly 28, 2011
Last updated in NPPESJuly 28, 2011
Mailing address17425 Parthenia St, Northridge, CA 91325-3240

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