Summary

Dr. Jacek Zajac treats type 2 diabetes mellitus, diabetes type 2 in children and teens, and hyperglycemic emergency, and practices endocrinology, diabetes and metabolism, and internal medicine. He has 35 years of experience and is affiliated with Elmhurst Memorial Hospital. Dr. Zajac earned his medical degree from Jagiellonian University Medical College and completed his residency at Beth Israel Medical Center. He sees patients in Lombard and Elmhurst, Illinois, and speaks English and Polish.

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
  • 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

Compare with Similar Doctors

Dr. Jacek Zajac, MD
Dr. Bekir Suveyd
Dr. Melissa McGee, DNP
Dr. Andrea Lynn Mccoy
Dr. Jacek Zajac, MDDr. Bekir SuveydDr. Melissa McGee, DNPDr. Andrea Lynn Mccoy
Endocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & Metabolism
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
3.5 
0 
0 
0 
35 Years of Experience 11 Years of Experience
No Virtual Visit Option Virtual Visit Available No Virtual Visit Option Virtual Visit Available
Speaks English, Polish Speaks English, Arabic Speaks English, Spanish
Lombard , ILChicago , ILHighwood , ILChicago , IL
Med School: Jagiellonian University Medical College Med School: Alfaisal University College Of Medicine
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.

Similar doctors

Frequently Asked Questions

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.
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.
Does Dr. Jacek Zajac accept my insurance?
You can see the insurance plans that Dr. Jacek Zajac accepts on their Vitals profile.
Is Dr. Jacek Zajac accepting new patients?
Dr. Jacek Zajac is accepting new patients on Vitals. View Dr. Jacek Zajac's profile on Vitals to make an appointment.

Data Sources

This provider profile is built using data from:

  • NPPES NPI Registry
  • State medical licensing boards
  • Healthcare system and provider network data

Ensuring Data Transparency and Trust: A Guide to Vitals Doctor Listings and Reviews

Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.