Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Gregory Erwin Davis, PHD

Individual provider Clinical Psychologist · NPI 1225157217

Dr. Gregory Erwin Davis, PHD is a Clinical Psychologist in Chicago, Illinois. Practices as a sole proprietor. Licensed in Illinois.

Licensed in
IL
In the registry since
2007
What do these letters mean?
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

1901 W Harrison St
Chicago, IL 60612-3714
Phone: (312) 864-6000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X (IL)

Record details

NPI number1225157217
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedMarch 28, 2007
Last updated in NPPESJuly 8, 2007

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