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GREGORY S CHASSON PH.D.
NPI 1629239629
Psychologist - Clinical in Oak Park, IL

Active since June 23, 2008PECOS EnrolledAccepts Medicare Assignment
97.71/100
CMS Quality Rating
1010 LAKE ST STE 428, OAK PARK, IL 60301(312) 386-7511(844) 633-7262 Get Directions Write a Review

NPPES record last updated: August 8, 2016. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Gregory S Chasson Ph.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GREGORY S CHASSON PH.D. (NPI 1629239629) is an individual clinical provider in Oak Park, Illinois, licensed in Maryland (04754) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and is a graduate of Other (2008).

NPPES Registry Identity

NPI1629239629
Entity TypeIndividualMale
Primary Taxonomy103TC0700X
Provider Legal NameGREGORY S CHASSONCredential: PH.D.
Location Address1010 LAKE ST STE 428Oak Park, IL 60301-1185
Mailing Address1010 Lake St Ste 428Oak Park, IL 60301-1185 · (312) 386-7511 · Fax (844) 633-7262
Phone(312) 386-7511
Fax(844) 633-7262
Sole ProprietorNo
Medical School CMSOtherGraduated 2008
Enumeration DateJune 23, 2008
Last NPPES UpdateAugust 8, 2016
✔ NPI 1629239629 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in MD · 04754
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
1010 LAKE ST STE 428, Oak Park, IL 60301
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gregory S Chasson Ph.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2264619519
PECOS Enrollment IDI20221108002058
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Gregory Chasson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The University Of Chicago Medical Center
12 mi
General Acute Care Hospital
5841 S MARYLAND AVE
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 1,905 clinicians in this Medicare group
NPI 1033218128 (773) 702-1530
University Of Chicago
12 mi
Multi-Specialty
5841 S MARYLAND AVE, UCPG/MC 1099
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 2,237 clinicians in this Medicare group
NPI 1821048786 (773) 702-9200

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

The University Of Chicago Medical Center

Acute Care Hospitals · Chicago, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140088
Location5841 South MarylandChicago, IL 60637 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60301 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$183.39 typical visit price
range $60.08 – $183.39
Typical copayment $45.84 (range $15.02 – $45.84)
Most-billed visit code 99205
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

97.71/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality75.43
Promoting Interoperability100
Improvement Activities40

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Chasson's NPI number?

The NPI number for Gregory Chasson is 1629239629. It was assigned to this individual provider in the NPPES registry on June 23, 2008.

Where is Gregory Chasson located?

Gregory Chasson practices at 1010 Lake St Ste 428, Oak Park, IL 60301. The listed phone number is (312) 386-7511.

What is Gregory Chasson's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Gregory Chasson enrolled in Medicare?

Yes. Gregory Chasson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Gregory Chasson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Chasson reassigns Medicare benefits to 2 organizations: The University Of Chicago Medical Center (Chicago, IL) and University Of Chicago (Chicago, IL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Chasson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Chasson accept?

Health plans from Oscar Health list Gregory Chasson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gregory Chasson affiliated with any hospitals?

According to CMS data, Gregory Chasson is affiliated with The University Of Chicago Medical Center.

When was this NPI record last updated?

The NPPES record for Gregory Chasson was last updated on August 8, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.