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JACEK GRELA M.D., S.C.
NPI 1366568297
Internal Medicine in Lemont, IL

Active since March 22, 2007CLIA 14D1076570 · Waiver
1011 STATE ST, SUITE 140, LEMONT, IL 60439(630) 754-0141 Get Directions Write a Review

NPPES record last updated: August 22, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Jacek Grela M.d., S.c. NPPES

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

JACEK GRELA M.D., S.C. (NPI 1366568297) is a healthcare organization registered as an internal medicine in Lemont, Illinois and active in the NPI registry since March 2007. The organization holds a CLIA Waiver certificate valid through November 15, 2027 and lists Jacek Grela, Physician, as its authorized official.

NPPES Registry Identity

NPI1366568297
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameJACEK GRELA M.D., S.C.
Location Address1011 STATE ST, SUITE 140Lemont, IL 60439-4768
Mailing Address10s570 Glenn DrBurr Ridge, IL 60527-6822 · (708) 415-2959 · Fax (708) 636-1825
Phone(630) 754-0141
Organization SubpartNo
Authorized OfficialJacek GrelaPhysician · (708) 415-2959
Enumeration DateMarch 22, 2007
Last NPPES UpdateAugust 22, 2020
✔ NPI 1366568297 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
1011 STATE ST, Lemont, IL 60439
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Jacek Grela M.d., S.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Jacek Grela M.D., S.C., which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Jacek Grela, M.D.
Internal Medicine
NPI 1700850625
1011 STATE ST SUITE 140
Lemont, IL 60439
(630) 754-0141
✔ PECOS✔ Accepts MedicareSame address
Michelle Stoklosa, APN
Nurse Practitioner
NPI 1588196802
14244 MCCARTHY RD
Lemont, IL 60439
(630) 754-0141
✔ PECOS1.7 mi

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 14D1076570

Jacek Grela M D S C · Lemont, IL
Active · expires Nov 15, 2027
CLIA Number14D1076570
Laboratory TypePhysician Office
Certificate Effective DateNovember 16, 2025
Certificate Expiration DateNovember 15, 2027
Laboratory DirectorJacek Grela
Laboratory Phone(630) 754-0141
Laboratory LocationJacek Grela M D S C14244 Mccarthy Rd, Lemont, IL 60439
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Jacek Grela M.D., S.C.'s NPI number?

The NPI number for Jacek Grela M.D., S.C. is 1366568297. It was assigned to this organization in the NPPES registry on March 22, 2007.

Where is Jacek Grela M.D., S.C. located?

Jacek Grela M.D., S.C. is located at 1011 State St Suite 140, Lemont, IL 60439. The listed phone number is (630) 754-0141.

What is Jacek Grela M.D., S.C.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Jacek Grela M.D., S.C. enrolled in Medicare?

Yes. Jacek Grela M.D., S.C. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Jacek Grela M.D., S.C.?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Jacek Grela M.D., S.C., in Internal Medicine and Nurse Practitioner. A 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 the clinician's services. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Jacek Grela M.D., S.C. hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 14D1076570) is associated with this NPI, valid through November 15, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Jacek Grela M.D., S.C. was last updated on August 22, 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.