Summary

Dr. Jacek Zajac specializes in endocrinology, diabetes and metabolism, as well as internal medicine. He earned his medical degree from Jagiellonian University Medical College and completed his residency at Beth Israel Medical Center. With 35 years of experience in practice, Dr. Zajac brings extensive knowledge to the management of complex hormonal and metabolic conditions. He is fluent in both English and Polish.

Dr. Zajac practices at multiple locations throughout the Chicago area, including Lombard and Elmhurst, Illinois, with hospital affiliations at Elmhurst Memorial Hospital and Advocate Good Samaritan Hospital. He focuses on treating patients with type 2 diabetes and helping children and teens manage diabetes effectively. His expertise includes performing thyroid hormone testing and thyroid-stimulating hormone evaluations to assess endocrine function. Patients have given him an average rating of 3.5 on Vitals.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 3.5
  • 35 years of experience
  • 32 insurance plans accepted
  • speaks English, Polish
  • Beth Israel Medical Center
  • 8 written reviews
  • 2 specialties
  • 14 areas of expertise
  • 2 board certifications
  • 1 hospital affiliation
  • 3 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Jacek Zajac has 3 locations

Endocrinology Associates

2500 S Highland Ave Ste 104Lombard, IL 60148
Mon9:00 am - 4:30 pm
Tue9:00 am - 4:30 pm
Wed9:00 am - 4:30 pm
Thu9:00 am - 4:30 pm
Fri9:00 am - 4:30 pm
SatClosed
SunClosed

Elmhurst Memorial Hospital

155 E Brush Hill RdElmhurst, IL 60126

Advocate Good Samaritan Hospital

3815 Highland AveDowners Grove, IL 60515

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Dr. Jacek Zajac, MD
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Dr. Jacek Zajac, MDDr. Bekir SuveydDr. Safa HammamiDr. Melissa McGee, DNP
Endocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & Metabolism
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
3.5 
35 Years of Experience 11 Years of Experience 11 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available No Virtual Visit Option
Speaks English, Polish Speaks English, Arabic Speaks English, Spanish
Lombard , ILCHICAGO , ILCHICAGO , ILHighwood , IL
Med School: Jagiellonian University Medical College Med School: Alfaisal University College Of Medicine Med School: Jordan University Of Science And Technology Faculty Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Jacek Zajac

  • AARP
  • Aetna
  • Aetna Better Health - Medicaid (Managed)
  • All Savers Insurance
  • Amita Health
  • Anthem Blue Cross
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of Illinois
  • Blue Shield of California
  • CHAMPVA
  • Cigna
  • Cigna-HealthSpring
  • Devoted Health
  • Humana
  • Humana - Medicare (Advantage HMO)
  • Medica
  • Medicaid - Medicaid
  • Medicaid - Medicaid (Managed)
  • Medicare
  • Medicare - Medicaid
  • Medicare - Medicare
  • Meridian Health Plan
  • Meritain Health
  • North Shore LIJ CareConnect
  • North Shore LIJ CareConnect - IPA
  • PreferredOne
  • State Farm
  • UnitedHealthcare
  • UnitedHealthcare - Medicare
  • Wellcare - Medicaid (Managed)
  • Wellmark Blue Cross Blue Shield
  • Wellmark Blue Cross Blue Shield - PPO

Medical Specialties

Dr. Jacek Zajac has the following 2 specialties

Specialty Expertise

Dr. Jacek Zajac has the following 14 areas of expertise

  • Acromegaly
  • Addison Disease
  • Cushing Disease
  • Diabetes
  • Diabetes (Types I & II)
  • Diabetes Mellitus, Type 1
  • Fatigue
  • Gland Issues
  • Hormones
  • Hyperthyroidism
  • Hypopituitarism
  • Hypothyroidism
  • Internal Medicine
  • Obesity

Certifications, License, & Education

35 Years Experience

Dr. Jacek Zajac holds an active medical license in the state of Illinois.

Medical License

Medical Doctor with an active medical license in the state of Illinois that expires in 2026.

Education & Training

Residency

Completed their residency at Beth Israel Medical Center.

Medical School

Graduated from Jagiellonian University Medical College in 1991.

NPI Number

Dr. Zajac's NPI number is 1396817912.

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Frequently Asked Questions

Does Dr. Jacek Zajac accept my insurance?
You can see the insurance plans that Dr. Jacek Zajac accepts on their Vitals profile.
Where is Dr. Jacek Zajac's office located?
Dr. Jacek Zajac's office is located at 2500 S Highland Ave Ste 104, Lombard, IL, 60148.
What languages does Dr. Jacek Zajac speak?
Dr. Jacek Zajac speaks English and Polish.
How can I make an appointment with Dr. Jacek Zajac?
You can find contact information for Dr. Jacek Zajac here on Vitals.
Which hospitals is Dr. Jacek Zajac affiliated with?
Dr. Jacek Zajac is affiliated with Elmhurst Memorial Hospital.

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