Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Daniel J Grzegorek, DO

Individual provider Internal Medicine Physician · NPI 1487651337

Daniel J Grzegorek, DO practises Internal Medicine in Willowbrook, Illinois. Graduated from Chicago College of Osteopathy in 1992, 34 years ago. Practices with Dupage Medical Group Ltd, a 1,328-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
34
Trained at
Chicago College of Osteopathy
Licensed in
IL
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

6733 Kingery Hwy
Willowbrook, IL 60527-5142
Phone: (630) 325-4049
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036-089211 (IL)

Record details

NPI number1487651337
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 7, 2005
Last updated in NPPESAugust 8, 2023
Certification dateAugust 8, 2023

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolCHICAGO COLLEGE OF OSTEOPATHY
Graduated 1992 (34 years in practice)
Group practice Dupage Medical Group Ltd — 1328 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations8 on file with Medicare

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 patients641
Services billed 6,210 a service is one billed item, such as a visit, a test or a procedure
Average patient age79

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. Those with a page here are linked.

  • Residential Home Health Home health agency · Lisle, IL · listed as Residential Home Health Illinois, LLC
  • Angels Grace Hospice Hospice · Bolingbrook, IL · listed as Angels Grace Hospice, LLC
  • Residential Hospice Hospice · Northbrook, IL · listed as Residential Hospice Illinois, LLC
  • Residential Hospice Llc Hospice · Lisle, IL · listed as Residential Hospice Illinois, LLC
  • Burgess Square Healthcare Ctr Nursing home · Westmont, IL · listed as Burgess Square Healthcare and Rehabilitation Centre, LLC
  • Uchicago Medicine Adventhealth Hinsdale Hospital · Hinsdale, IL
  • Advocate Home Health Care Serv Home health agency · Oakbrook, IL
  • Uchicago Medicine Adventhealth Home Care Home health agency · La Grange, IL

Colleagues at Dupage Medical Group Ltd

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1328 clinicians in the practice; 12 are shown here.

Other providers in Willowbrook