Summary

Dr. Jacek Zajac specializes in endocrinology, diabetes and metabolism, with additional expertise in internal medicine. He earned his medical degree from Jagiellonian University Medical College and completed his residency training at Beth Israel Medical Center. With 35 years of experience in practice, Dr. Zajac brings extensive knowledge to his patient care. He is fluent in both English and Polish.

Dr. Zajac practices at multiple locations including Lombard and Elmhurst, Illinois, with hospital affiliations at Elmhurst Memorial Hospital and Advocate Good Samaritan Hospital. His clinical focus includes treating Type 2 diabetes in both adults and younger patients. He also manages serious blood sugar emergencies that require immediate attention. Patients have given Dr. Zajac an average rating of 3.5 out of 5 stars.

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. Rabab Zehra Jafri, MDAndrea Lynn MccoyMelissa 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 16 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available No Virtual Visit Option
Speaks English, Polish Speaks English, Hindi, Urdu Speaks English, Spanish
Lombard , ILChicago , ILCHICAGO , ILHighwood , IL
Med School: Jagiellonian University Medical College Med School: Aga Khan University Medical College
Current Profile
View Profile View Profile View Profile

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 expired medical license in the state of Illinois.

Medical License

Medical Doctor with an expired medical license in the state of Illinois that expired 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

What languages does Dr. Jacek Zajac speak?
Dr. Jacek Zajac speaks English and Polish.
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.
Which hospitals is Dr. Jacek Zajac affiliated with?
Dr. Jacek Zajac is affiliated with Elmhurst Memorial Hospital.
How can I make an appointment with Dr. Jacek Zajac?
You can find contact information for Dr. Jacek Zajac here on Vitals.
Does Dr. Jacek Zajac accept my insurance?
You can see the insurance plans that Dr. Jacek Zajac accepts on their Vitals profile.

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