Alexander S. Tosiou
Advanced in Colitis

Dr. Alexander S. Tosiou

Gastroenterology
Northwestern Medical Group
800 N Westmoreland Rd Ste 100, 
Lake Forest, IL 
33 Years of Experience

Advanced in Colitis
Northwestern Medical Group
800 N Westmoreland Rd Ste 100, 
Lake Forest, IL 
OverviewInsuranceLocationsSimilar Doctors

Overview

Alexander Tosiou is a Gastroenterologist in Lake Forest, Illinois. Dr. Tosiou has been practicing medicine for over 33 years and is rated as an Advanced provider by MediFind in the treatment of Colitis. His top areas of expertise are Lower Esophageal Ring, Benign Esophageal Stricture, Diarrhea, Gastrectomy, and Endoscopy.

Graduate Institution
Loyola University Stritch School Of Medicine, 1993.0
Residency
McGaw Medical Center of Northwestern University
Specialties
Gastroenterology
Licenses
Internal Medicine in IL
Board Certifications
American Board Of Internal Medicine - Gastroenterology (Certified)
Fellowships
Advocate Health Care (Advocate Lutheran General Hospital)
Hospital Affiliations
Northwestern Memorial Hospital
Northwestern Lake Forest Hospital
Languages Spoken
English
Gender
Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

Find your insurance
Find your insuranceClose

Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Anthem BCBS
  • EPO
  • HMO
  • POS
  • PPO
Blue Cross Blue Shield
  • EPO
  • HMO
  • POS
  • PPO
Blue Shield of California
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE-MEDICAID PLAN
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
CareFirst
  • HMO
  • POS
  • PPO
Change Healthcare
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
Cigna
  • EPO
  • HMO
  • PPO
Devoted Health
  • MEDICARE MAPD
  • OTHER MEDICARE
Health Alliance
  • EPO
  • HMO
  • POS
  • PPO
Health Care Services Corporation
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
Highmark
  • EPO
  • HMO
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Managed Medicaid
  • OTHER MANAGED MEDICAID
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
Meridian Choice
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
Nippon Life
  • INSURANCE PLAN
Northern Plains Alliance
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE PDP
Premera Blue Cross
  • INSURANCE PLAN
  • MEDICARE MAPD
  • OTHER COMMERCIAL
  • PPO
TeamCare
  • OTHER COMMERCIAL
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
Walgreens
  • MEDICARE DISCOUNT CARD
  • MEDICARE PDP
  • OTHER MEDICARE
Wellcare
  • EPO
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
View 18 Less Insurance Carriers -

Locations

800 N Westmoreland Rd Ste 100, Lake Forest, IL 60045
Call: 847-802-7070
Similar Doctors
Parambir S. Dulai
Elite in Colitis
Dr. Parambir S. Dulai
Gastroenterology
Elite in Colitis
Dr. Parambir S. Dulai
Gastroenterology
259 E Erie St Ste 1600, Lavin Family Pavilion, 
Chicago, IL 
 (26.8 miles away)
312-695-5620
Experience:
17+ years
Languages Spoken:
English
See accepted insurances
Offers Telehealth

Parambir Dulai is a Gastroenterologist in Chicago, Illinois. Dr. Dulai has been practicing medicine for over 17 years and is rated as an Elite provider by MediFind in the treatment of Colitis. His top areas of expertise are Viral Gastroenteritis, Ulcerative Colitis, Hemorrhagic Proctocolitis, Endoscopy, and Colonoscopy.

Stephen B. Hanauer
Elite in Colitis
Dr. Stephen B. Hanauer
Gastroenterology
Elite in Colitis
Dr. Stephen B. Hanauer
Gastroenterology
259 E Erie St Ste 1600, Lavin Family Pavilion, 
Chicago, IL 
 (26.8 miles away)
312-695-5620
Experience:
49+ years
Languages Spoken:
English
See accepted insurances
Offers Telehealth

Stephen Hanauer is a Gastroenterologist in Chicago, Illinois. Dr. Hanauer has been practicing medicine for over 49 years and is rated as an Elite provider by MediFind in the treatment of Colitis. His top areas of expertise are Crohn's Disease, Viral Gastroenteritis, Ulcerative Colitis, Colonoscopy, and Endoscopy.

Elite in Colitis
Dr. Frank Hoentjen
Gastroenterology
Elite in Colitis
Dr. Frank Hoentjen
Gastroenterology
5841 S Maryland Ave, Room M226(mc4076), 
Chicago, IL 
 (33.7 miles away)
773-702-6073
Languages Spoken:
English

Frank Hoentjen is a Gastroenterologist in Chicago, Illinois. Dr. Hoentjen is rated as a Distinguished provider by MediFind in the treatment of Colitis. His top areas of expertise are Viral Gastroenteritis, Colitis, Crohn's Disease, Colonoscopy, and Endoscopy.

VIEW MORE COLITIS DOCTORS

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

Find Dr. Tosiou's expertise for a condition
ConditionClose
      • Advanced
      • Barrett Esophagus
        Dr. Tosiou is
        Advanced
        . Learn about Barrett Esophagus.
        See more Barrett Esophagus experts
      • Benign Esophageal Stricture
        Dr. Tosiou is
        Advanced
        . Learn about Benign Esophageal Stricture.
        See more Benign Esophageal Stricture experts
      • Chronic Erosive Gastritis
        Dr. Tosiou is
        Advanced
        . Learn about Chronic Erosive Gastritis.
        See more Chronic Erosive Gastritis experts
      • Colitis
        Dr. Tosiou is
        Advanced
        . Learn about Colitis.
        See more Colitis experts
      • Diarrhea
        Dr. Tosiou is
        Advanced
        . Learn about Diarrhea.
        See more Diarrhea experts
      • Esophagitis
        Dr. Tosiou is
        Advanced
        . Learn about Esophagitis.
        See more Esophagitis experts
      View All 16 Advanced Conditions
      • Experienced
      • Anemia
        Dr. Tosiou is
        Experienced
        . Learn about Anemia.
        See more Anemia experts
      • Bacterial Gastroenteritis
        Dr. Tosiou is
        Experienced
        . Learn about Bacterial Gastroenteritis.
        See more Bacterial Gastroenteritis experts
      • Childhood Volvulus
        Dr. Tosiou is
        Experienced
        . Learn about Childhood Volvulus.
        See more Childhood Volvulus experts
      • Cirrhosis
        Dr. Tosiou is
        Experienced
        . Learn about Cirrhosis.
        See more Cirrhosis experts
      • Collagenous Colitis
        Dr. Tosiou is
        Experienced
        . Learn about Collagenous Colitis.
        See more Collagenous Colitis experts
      • Colonic Malakoplakia
        Dr. Tosiou is
        Experienced
        . Learn about Colonic Malakoplakia.
        See more Colonic Malakoplakia experts
      View All 31 Experienced Conditions
      Want to save this doctor for later?
      Sign Up
      Is this your doctor?
      Find A Second Opinion
      Not sure about your diagnosis?
      Check Your Symptoms
       
       
       
       
      Learn about our expert tiers
      Learn More
      Are you the provider on this profile?
      Claim Profile
      For Patients
      • Our Story
      • How MediFind Works
      • Conditions A-Z
      • Doctor Directory
      • Symptoms Directory
      • Procedures Directory
      • Treatment Directory
      • Drug Directory
      • Infusion Center Finder
      • FAQ
      • Contact Us
      For Providers and Practices
      • Claim Your Profile
      • Newsroom
      Business Solutions
      • Provider
      • Network Solutions
      Additional Resources
      • Consumer Health Data Privacy Policy
      • Privacy Policy
      • Terms of Use
      • Advertising Policy
      • Content Policy
      Subscribe to our newsletter

      Sign up to stay informed about MediFind and get wellness sent your way.

      Close

        By subscribing, I agree to MediFind's Terms of Use, Privacy Policy and Consumer Health Data Privacy Policy, as applicable.

        Bullet PinMediFind
        Follow us on
        This information is not intended as a substitute for informed medical advice. You should work with a licensed professional to diagnose and treat health conditions. We let the data speak for itself, MediFind does not endorse any healthcare providers.
        © 2026 All Rights Reserved

        Request an Appointment

        If you are experiencing a medical emergency, call 9-1-1.

        MediFind will contact the provider for your appointment request. You’ll receive status updates by email. Your provider or MediFind will reach out to you directly by phone or email to schedule your appointment or request additional information.

        Patient Details

        This information is for the patient who will be seen at the appointment.

          Close

          Returning patient? Use your address on file with the provider.

          Insurance Details

          Please provide information of the primary insurance holder as the practice may require this information to schedule.

          Insurance Provider *
          Insurance ProviderClose

          Appointments Details

          Let’s get more information about your appointment.

                  0 / 1000
                  0 / 1000
                  By pressing the Submit button you are agreeing to MediFind’s Terms of Use, Privacy Policy and Consumer Health Data Privacy Policy, as applicable.