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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MAREK J GRZESKOWIAK MD
NPI 1821259003
Family Medicine - Hospice and Palliative Medicine in Glenview, IL

Active since June 20, 2008PECOS Enrolled
90.18/100
CMS Quality Rating
2050 CLAIRE CT, GLENVIEW, IL 60025(847) 556-1707(847) 556-1715 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 29, 2026, Mar 1, 2017 (2 updates tracked since 2017).

About Marek J Grzeskowiak Md NPPES

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

MAREK J GRZESKOWIAK MD (NPI 1821259003) is an individual hospice and palliative medicine provider in Glenview, Illinois, licensed in Illinois (036126699) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1821259003
Entity TypeIndividualMale
Primary Taxonomy207QH0002X
Provider Legal NameMAREK J GRZESKOWIAKCredential: MD
Location Address2050 CLAIRE CTGlenview, IL 60025-7635
Mailing Address2050 Claire CtGlenview, IL 60025-7635 · (847) 556-1707 · Fax (847) 556-1715
Phone(847) 556-1707
Fax(847) 556-1715
Sole ProprietorNo
Enumeration DateJune 20, 2008
Last NPPES UpdateSeptember 29, 20262 updates tracked since enumeration
✔ NPI 1821259003 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily Medicine · Hospice and Palliative MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QH0002X
License✔ Licensed in IL · 036126699
Definition
A family medicine physician with special knowledge and skills to prevent and relieve the suffering experienced by patients with life-limiting illnesses. This specialist works with an interdisciplinary hospice or palliative care team to maximize quality of life while addressing physical, psychological, social and spiritual needs of both patient and family throughout the course of the disease, through the dying process, and beyond for the family. This specialist has expertise in the assessment of patients with advanced disease; the relief of distressing symptoms; the coordination of interdisciplinary patient and family-centered care in diverse venues; the use of specialized care systems including hospice; the management of the imminently dying patient; and legal and ethical decision making in end-of-life care.
2050 CLAIRE CT, Glenview, IL 60025
Open in Google Maps ↗

Other Identifiers 2

Medicaid1821259003WI
OtherGRZESMARWI · Mercycare Insurance

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Marek J Grzeskowiak Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Marek Grzeskowiak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Natarajan Medical Group Of Illinois, PC
7.6 mi
Hospice and Palliative Medicine
6400 SHAFER CT STE 300
Rosemont, IL 60018
  • Reassigned Medicare billing, Illinois enrollment
  • 37 clinicians in this Medicare group
NPI 1639430861 (847) 759-9449

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 60025 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
$94.06 typical visit price
range $60.08 – $183.39
Typical copayment $23.51 (range $15.02 – $45.84)
Most-billed visit code 99203
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.

90.18/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality65.37
Improvement Activities40
Cost80.13

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. DEBRA NAOMI TORRES LCSW
Social Worker (Clinical)
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423
TERESA TRUSSELL APN
Nurse Practitioner (Family)
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423
DR. LYNN S. KATTEN MD
Internal Medicine
2050 CLAIRE CT, MIDWEST PALLIATIVE & HOSPICE CARECENTER
GLENVIEW, IL 60025
Cook County (847) 467-7423
MIRIAM G CORREA APN
Nurse Practitioner (Gerontology)
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423
CATHERINE D. DEAMANT MD
Internal Medicine (Hospice and Palliative Medicine)
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423
MIDWEST PALLIATIVE & HOSPICE CARECENTER
Internal Medicine (Hospice and Palliative Medicine)
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423
MRS. CATHERINE BUXTON HOLMQUIST LCSW
Social Worker (Clinical)
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423
MRS. RHONDA SHARON SOLID NP
Nurse Practitioner
2050 CLAIRE CT
GLENVIEW, IL 60025
Cook County (847) 467-7423

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 Marek Grzeskowiak's NPI number?

The NPI number for Marek Grzeskowiak is 1821259003. It was assigned to this individual provider in the NPPES registry on June 20, 2008.

Where is Marek Grzeskowiak located?

Marek Grzeskowiak practices at 2050 Claire Ct, Glenview, IL 60025. The listed phone number is (847) 556-1707.

What is Marek Grzeskowiak's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Hospice and Palliative Medicine, with taxonomy code 207QH0002X.

Is Marek Grzeskowiak enrolled in Medicare?

Yes. Marek Grzeskowiak is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Marek Grzeskowiak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marek Grzeskowiak reassigns Medicare benefits to Natarajan Medical Group Of Illinois, PC (Rosemont, 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 Marek Grzeskowiak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Marek Grzeskowiak was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 days 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.