Summary

Dr. Alexander Tosiou specializes in gastroenterology, focusing on digestive health and disorders of the gastrointestinal tract. He earned his medical degree from Loyola University Stritch School of Medicine and completed his residency at McGaw Medical Center of Northwestern University in 1996. Dr. Tosiou further advanced his expertise through a fellowship at Advocate Health Care (Advocate Lutheran General Hospital) in 1999. With over three decades of experience in gastroenterology, he is fluent in both English and Spanish.

Dr. Tosiou practices at Northwestern Medicine Lake Forest Hospital and sees patients at locations in Lake Forest and Grayslake, Illinois. He treats conditions such as esophagitis, hemorrhoids, and colon polyps. His procedural expertise includes performing colonoscopies and lower gastrointestinal endoscopies, along with ordering pathology tests to help diagnose digestive disorders. Patients rate Dr. Tosiou 3.9 stars on average for his care.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 3.9
  • 33 years of experience
  • 12 insurance plans accepted
  • speaks English, Spanish
  • Advocate Health Care (Advocate Lutheran General Hospital)
  • 7 written reviews
  • 2 specialties
  • 6 areas of expertise
  • 1 board certification
  • 1 hospital affiliation
  • 2 office locations
  • Male

Office Locations

Dr. Alexander S. Tosiou has 2 locations

Northwestern Medical Group

800 N Westmoreland Rd Ste 100Lake Forest, IL 60045

Northwestern Medicine Gastroenterology Grayslake Outpatient Center

1475 E Belvidere Rd Ste 311Grayslake, IL 60030

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Dr. Alexander S. Tosiou, MDDr. Amit Kalra, MDDr. Jonathan Rosenberg, MDDr. Jennifer Spanier-Stiasny, DO
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
3.9 
4.5 
3.5 
4.5 
33 Years of Experience 22 Years of Experience
Virtual Visit Available No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English Speaks Spanish, English Speaks English
Lake Forest , ILHighland Park , ILGurnee , ILHighland Park , IL
Med School: Loyola University Stritch School of Medicine Med School: University of Illinois Med School: University of Illinois Chicago of Medicine Med School: Kansas City University of Medicine and Biosciences
Current Profile
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Insurance Plans Accepted by Dr. Alexander S. Tosiou

  • Aetna
  • Blue Cross Blue Shield of Illinois
  • Cigna
  • Health Alliance
  • Humana
  • Medicare
  • Medicare - Medicare
  • Meridian Health Plan - Medicaid (Managed)
  • Meritain Health
  • MetroPlus Health Plan - Medicaid (Managed)
  • Molina Healthcare - Medicaid (Managed)
  • UnitedHealthcare

Medical Specialties

Dr. Alexander S. Tosiou has the following 2 specialties

Specialty Expertise

Dr. Alexander S. Tosiou has the following 6 areas of expertise

  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Gastroenterologist
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Certifications, License, & Education

33 Years Experience

MEDICAL LICENSE

Medical Doctor, Illinois, 2026, Active

EDUCATION & TRAINING

Fellowship

Advocate Health Care (Advocate Lutheran General Hospital)1999

Residency

McGaw Medical Center of Northwestern University1996

Medical School

Loyola University Stritch School of MedicineGraduated in 1993

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Frequently Asked Questions

Does Dr. Alexander Tosiou accept my insurance?
You can see the insurance plans that Dr. Alexander Tosiou accepts on their Vitals profile.
Which hospitals is Dr. Alexander Tosiou affiliated with?
Dr. Alexander Tosiou is affiliated with Northwestern Medicine Lake Forest Hospital.
Does Dr. Alexander Tosiou accept virtual/telehealth appointments?
Yes, Dr. Alexander Tosiou accepts virtual/telehealth appointments. Click the virtual visit button on their Vitals profile.
How can I make an appointment with Dr. Alexander Tosiou?
You can find contact information for Dr. Alexander Tosiou here on Vitals.
Is Dr. Alexander Tosiou accepting new patients?
Dr. Alexander Tosiou is accepting new patients on Vitals. View Dr. Alexander Tosiou's profile on Vitals to make an appointment.

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