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

Individual provider Clinical Psychologist · NPI 1790816841

Dr. John E Mayer, PHD is a Clinical Psychologist in Chicago, Illinois. Qualified in 1979, 47 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
47
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

55 E Washington St 38th Fl
Chicago, IL 60602-2103
Phone: (312) 917-1240
Fax: (312) 917-1010
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 071-02554 (IL)

Record details

NPI number1790816841
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedMarch 8, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1979 (47 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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