Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Richard R Trezona Jr., PHD

Individual provider Rehabilitation Psychologist · NPI 1811167489

Dr. Richard R Trezona Jr., PHD is a Clinical Psychologist in Chicago, Illinois. Qualified in 1978, 48 years ago. Practices with Central Dupage Physician Group, a 1,094-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
48
Licensed in
IL
In the registry since
2008
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

345 E Superior St
Chicago, IL 60611-2654 Not confirmed with CMS for 18 years — call before visiting
Phone: (312) 238-4271
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rehabilitation Psychologist (primary) Taxonomy 103TR0400X · Licence 071.003687 (IL)

Record details

NPI number1811167489
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedMarch 10, 2008
Last updated in NPPESMarch 10, 2008

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1978 (48 years in practice)
Group practice Central Dupage Physician Group — 1094 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients305
Services billed 585 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Northwestern Medicine Central Dupage Hospital Hospital · Winfield, IL

Colleagues at Central Dupage Physician Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1094 clinicians in the practice; 12 are shown here.

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