DR. MARK GEORGE JIARAS PSY.D.
NPI 1932110020
Psychologist - Clinical in Wilmette, IL
About Dr. Mark George Jiaras Psy.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK GEORGE JIARAS PSY.D. (NPI 1932110020) is an individual clinical provider in Wilmette, Illinois, licensed in Illinois (071-006111) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1999).
NPPES Registry Identity
Specialties & Licenses
Accepted 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
Dr. Mark George Jiaras Psy.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.
Medicare Billing Reassignment
Medicare enrollment records show Mark Jiaras reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chicago, IL 60646
- Reassigned Medicare billing, Illinois enrollment
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60091 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Mark Jiaras's NPI number?
The NPI number for Mark Jiaras is 1932110020. It was assigned to this individual provider in the NPPES registry on August 11, 2006.
Where is Mark Jiaras located?
Mark Jiaras practices at 825 Green Bay Rd Ste 210, Wilmette, IL 60091. The listed phone number is (847) 630-3900.
What is Mark Jiaras's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Mark Jiaras enrolled in Medicare?
Yes. Mark Jiaras 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 organization bills Medicare for Mark Jiaras's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Jiaras reassigns Medicare benefits to Mark Jiaras Ltd (Chicago, IL). The 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 Mark Jiaras's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Jiaras accept?
Health plans from Oscar Health list Mark Jiaras 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.
When was this NPI record last updated?
The NPPES record for Mark Jiaras was last updated on October 19, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Dr. Mark George Jiaras, PSY.D. · NPI 1932110020
Clinical provider in Wilmette, Illinois. Individual provider, active in the CMS NPPES registry since August 11, 2006.
## Identity
- **NPI:** 1932110020 (Entity type: Individual)
- **Enumerated:** August 11, 2006
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** 071-006111 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 825 GREEN BAY RD STE 210, Wilmette, IL 60091-2500
- **Phone:** (847) 630-3900
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Mark Jiaras Ltd (NPI 1336502434, Chicago, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1999
## Record status
- **NPPES last updated:** October 19, 2020
---
Source: [NPI Profile](https://npiprofile.com/npi/1932110020) · Data from the CMS NPPES public registry.