Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Jacek Zajac, MD

Individual provider Endocrinology, Diabetes & Metabolism Physician · NPI 1396817912

Jacek Zajac, MD is an Endocrinology in Lombard, Illinois. Qualified in 1991, 35 years ago. Practices with Endocrinology Associates SC, a 2-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
35
Licensed in
IL
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2500 S Highland Ave Ste 104
Lombard, IL 60148-5381
Phone: (630) 629-3610
Fax: (630) 629-4878
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Endocrinology, Diabetes & Metabolism Physician (primary) Taxonomy 207RE0101X · Licence 361-07774 (IL)

Record details

NPI number1396817912
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 15, 2006
Last updated in NPPESFebruary 20, 2024
Certification dateFebruary 20, 2024

Medicare enrollment

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

Medicare specialtyENDOCRINOLOGY
Medical schoolOTHER
Graduated 1991 (35 years in practice)
Group practice Endocrinology Associates Sc — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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