NPPES file of Aug 9, 2026

John E. Mayer, PH.D.

Clinical Psychologist · Chicago, IL

John E. Mayer, PH.D. is a clinical psychologist with a practice address in Chicago, Illinois, and NPI 1790816841, issued on Mar 8, 2007. Check the license (Illinois 071-02554, as entered in NPPES) with the Illinois board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1790816841
Name
John E. Mayer
Credential
PH.D.
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
071-02554 IL
Self-reported in NPPES; status is on the state search
Practice location
55 E Washington St, Chicago, IL 60602
Phone
(312) 917-1240
Enumerated
Mar 8, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(312) 917-1010
Medicare enrollment
Enrolled (PECOS I20060201000721); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical psychologist records → All 3,947 in Illinois → Look up another NPI →

Also registered at 55 E Washington St

A shared address usually means a shared clinic or building; it does not show who employs whom.

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  2. Carolyn Belke, MSDentist1689877342
  3. David Benditzson, M.D.Specialist1518946656
  4. Lewis Blumenthal, MDObstetrics & Gynecology Physician1750366209
  5. Wendy Boxer, PH.D.Mental Health Counselor1902957061
  6. Paul BuenvenidaDentist1760638159

Verify John E. Mayer in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Illinois board licenses this profession
    Search for license 071-02554    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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John E. Mayer among 3,947 clinical psychologist records in Illinois

John E. Mayer, PH.D. is one of 3,947 clinical psychologist records with a practice address in Illinois. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 24% of them.

  • NPI issued2007 · 24% of these records are older, 57% newer
  • In a Medicare fileNo · 16% of these records are
  • In the CMS Doctors and Clinicians fileYes · 27% of these records are
  • Graduated1979 · median 2004 among the 1,081 with a school on file
  • Record last updated2007 · 68% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

1,478 clinical psychologist records list a practice address in Chicago

They are 1,478 of the 63,379 NPPES records with a practice address in Chicago, and 3,947 clinical psychologist records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 3,947 in Illinois → Every provider in Chicago → Clinical Psychologist nationwide →

The 8 clinical psychologist records with the nearest ZIP codes

  1. William Aber, PH.D.Chicago, IL 606021598777187
  2. Bruce Bonecutter, PHDChicago, IL 606021235189887
  3. Betty Burrows, PH.D.Chicago, IL 606021760494371
  4. Eleanor Coe, PSY.D.Chicago, IL 606021558374157
  5. John Friedman, PH.D.Chicago, IL 606021053321836
  6. Janice Friedman, PHDChicago, IL 606021639275829
  7. Karen Jaffe, PSY.D.Chicago, IL 606021154357044
  8. Alan Jaffe, PSYDChicago, IL 606021437187689

Common questions

What is John E. Mayer, PH.D.'s NPI number?

John E. Mayer, PH.D.'s National Provider Identifier (NPI) is 1790816841, issued on Mar 8, 2007. An NPI identifies a provider in billing; it is not a license.

Where is John E. Mayer, PH.D. located?

The NPPES record lists a practice address at 55 E Washington St, Chicago, IL, 60602. Phone: (312) 917-1240. Providers update this record themselves, so call before visiting.

How can I verify John E. Mayer, PH.D.'s license?

NPPES lists Illinois license number 071-02554, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.