Summary

Dr. William Bayer is an endocrinologist specializing in diabetes and metabolism, as well as internal medicine. He earned his medical degree from Loyola University of Chicago Stritch School of Medicine and completed his residency at Loyola University Medical Center. With four decades of clinical experience, Dr. Bayer brings extensive expertise to the care of patients with hormonal and metabolic conditions. He is fluent in both English and Spanish.

Dr. Bayer practices at Northwestern Medicine Central Dupage Hospital and sees patients at multiple locations throughout Illinois, including Carol Stream, Bloomingdale, Maywood, Winfield, and Geneva. His clinical focus centers on managing diabetes in older adults and various forms of diabetes mellitus. He performs essential diagnostic tests including thyroid function evaluations and complete blood counts to help monitor his patients' health. Patients have given Dr. Bayer an average rating of 4.0 on Vitals.

AI-generated from data on this provider profile.

Quick Facts

  • accepting new patients
  • 4
  • 40 years of experience
  • 26 insurance plans accepted
  • speaks English, Spanish
  • Loyola University Medical Center
  • 9 written reviews
  • 2 specialties
  • 16 areas of expertise
  • 2 board certifications
  • 1 hospital affiliation
  • 1 office location
  • Male

Office Location

Compare with Similar Doctors

Dr. William C. Bayer, MD
Dr. Andrea Lynn Mccoy
Dr. Bekir Suveyd
Dr. Safa Hammami
Dr. William C. Bayer, MDDr. Andrea Lynn MccoyDr. Bekir SuveydDr. Safa Hammami
Endocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & Metabolism
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
40 Years of Experience 11 Years of Experience 11 Years of Experience
Virtual Visit Available Virtual Visit Available Virtual Visit Available Virtual Visit Available
Speaks English, Spanish Speaks English, Arabic
Bloomingdale , ILCHICAGO , ILCHICAGO , ILCHICAGO , IL
Med School: Loyola University Stritch School of Medicine Med School: Alfaisal University College Of Medicine Med School: Jordan University Of Science And Technology Faculty Of Medicine
Current Profile
View Profile View Profile View Profile

Insurance Plans Accepted by Dr. William C. Bayer

  • Aetna
  • Aetna - Medicare
  • Aetna Better Health - Medicaid (Managed)
  • Ambetter
  • AmeriGroup
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield - PPO
  • Blue Cross Blue Shield of Illinois
  • Cigna
  • Health Alliance
  • Humana
  • Medicaid - Medicaid
  • Medicaid - Medicaid (Managed)
  • Medicare
  • Medicare - Medicaid
  • Medicare - Medicare
  • Meridian Health Plan - Medicaid (Managed)
  • Meritain Health
  • Molina Healthcare - Medicaid (Managed)
  • Nippon Life Benefits
  • North Shore LIJ CareConnect
  • North Shore LIJ CareConnect - IPA
  • Priority Health
  • Tricare
  • UnitedHealthcare
  • UnitedHealthcare - Medicare

Medical Specialties

Dr. William C. Bayer has the following 2 specialties

Specialty Expertise

Dr. William C. Bayer has the following 16 areas of expertise

  • Acromegaly
  • Addison Disease
  • Cushing Disease
  • Diabetes
  • Diabetes Mellitus, Type 1
  • Diabetes, Type 2
  • Endocrinology
  • Endocrinology & Metabolism
  • Fatigue
  • Gland Issues
  • Hormones
  • Hyperthyroidism
  • Hypopituitarism
  • Hypothyroidism
  • Osteoporosis
  • Thyroid Diseases

Certifications, License, & Education

40 Years Experience

MEDICAL LICENSE

Medical Doctor, Illinois, 2026, Active

EDUCATION & TRAINING

Fellowship

Loyola University Medical Center1991

Residency

Loyola University Medical Center1989

Medical School

Loyola University Stritch School of MedicineGraduated in 1986

Similar doctors

Frequently Asked Questions

What languages does Dr. William Bayer speak?
Dr. William Bayer speaks English and Spanish.
Is Dr. William Bayer accepting new patients?
Dr. William Bayer is accepting new patients on Vitals. View Dr. William Bayer's profile on Vitals to make an appointment.
Which hospitals is Dr. William Bayer affiliated with?
Dr. William Bayer is affiliated with Northwestern Medicine Central Dupage Hospital.
Does Dr. William Bayer accept my insurance?
You can see the insurance plans that Dr. William Bayer accepts on their Vitals profile.
Does Dr. William Bayer accept virtual/telehealth appointments?
Yes, Dr. William Bayer accepts virtual/telehealth appointments. Click the virtual visit button on their Vitals profile.

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.