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Dr. Alexandra Guillaume, MD
Gastroenterology* Age 49
Dr. Alexandra Guillaume, MD
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Dr. Alexandra Guillaume, MD is a Gastroenterologist in East Setauket, NY.
Dr. Alexandra Guillaume, MD
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Dr. Alexandra Guillaume, MD

Gastroenterology* Age 49
East Setauket, NY
Accepting new patients
20 years of experience
Dr. Alexandra Guillaume, MD is a Gastroenterologist in East Setauket, NY.
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About

Dr. Guillaume graduated from Tufts University. Dr. Alexandra Guillaume, MD is a Gastroenterologist in East Setauket, NY and has 20 years experience. Dr. Guillaume has experience treating conditions like Gastrointestinal Malabsorption, Gas-Bloat Syndrome, Constipation, Abdominal Pain, Diarrhea and Esophageal Achalasia and Cardiospasm among other conditions at varying frequencies. Dr. Guillaume's office accepts new patients. Dr. Guillaume is board certified in Gastroenterology and accepts multiple insurance plans.

Experience Check

Enter a condition or procedure
Gastrointestinal Malabsorption
Gas-Bloat Syndrome
Constipation
Gastrointestinal Malabsorption
Gas-Bloat Syndrome
Constipation
Gastrointestinal Malabsorption
Gas-Bloat Syndrome
Constipation
Abdominal Pain
Diarrhea
  • View other providers who treat Diarrhea
Esophageal Achalasia and Cardiospasm
Lactose Intolerance
Duodenal Ulcer
Diaphragmatic and Hiatal Hernia
Dysphagia
Nausea
  • View other providers who treat Nausea
Rigid Proctosigmoidoscopy
Manometry
Flexible Sigmoidoscopy
Heartburn
Gastroesophageal Reflux Disease (GERD)
Chronic Gastritis
Hemorrhoids
Gastroparesis
Gastritis
Gastrointestinal Bleeding
Endoscopy
Gastroptosis
Esophagitis
Duodenal Polypectomy
Intestinal Ulcer
Irritable Bowel Syndrome
Gastric Ulcer
Intestinal Diverticulosis
Eosinophilic Esophagitis
Non-Alcoholic Fatty Liver Disease
Anemia
  • View other providers who treat Anemia
Removal or Destruction of Rectal or Intestinal Tumor (incl. Colonoscopy, Proctosigmoidoscopy, Sigmoidoscopy and Control of Hemorrhage)
Reflux Esophagitis
Duodenitis
Dehydration
Vomiting Disorders
Hypokalemia
Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
Colonoscopy
Anal or Rectal Pain
Esophageal Ulcer
Esophageal Motility Disorders
Colorectal Polyp
Esophageal Varices
Malnutrition
Barrett's Esophagus
Vitamin_Deficiency
Noninfectious Gastroenteritis and Colitis
Acute Gastritis
Alcoholic Cirrhosis
Alcoholic Hepatitis
Ascites
  • View other providers who treat Ascites
Barretts Esophagus with Dysplasia
Benign Neoplasm of the Digestive System
Biliary Cirrhosis
Bowel Strangulation
Celiac Disease
Cholangitis
Cirrhosis
Congenital Achalasia
Congenital Anomaly Esophagus
Congenital Anomaly Intestine
Crohn's Disease
Cyclical Vomiting
Cyclical Vomiting Syndrome
Cystic Fibrosis
Diffuse Esophageal Spasm
Duodenal Cancer
Dysentery
Ehlers-Danlos Syndrome
Enteritis
Eosinophilic Gastritis
Esophageal Diverticulum
Familial Adenomatous Polyposis
Food Allergy
Gallstones
Gastrojejunal Ulcer
Hemochromatosis
Hepatitis B
Hepatitis B - Immune Response
Hepatitis C
Hepatorenal Syndrome
Hereditary Amyloidosis
Hernia
  • View other providers who treat Hernia
Hiatal Hernia
Hiatal Hernia with Obstruction
Ileus
  • View other providers who treat Ileus
Indigestion
Infectious Diarrheal Disease
Inflammatory Bowel Disease
Intestinal Diverticulitis
Intestinal Malabsorption Carbohydrate
Intestinal Obstruction
Intestinal Prolapse
Ischemic Colitis
Liver Abscess
Liver Damage from Alcohol
Neoplasm of Gastrointestinal Tract
Pancreatic Pseudocyst
Pancreatitis
Peptic Ulcer
Pernicious Anemia
Primary Biliary Cholangitis
Primary Sclerosing Cholangitis
Proctoptosis
Pyloric Stenosis
Rectal Prolapse
Rectal Ulcer
Retroperitoneum Cancer
Sclerosing Mesenteritis
Splenomegaly
Ulcerative Colitis
Unexplained Weight Loss
Upper Digestive Tract Cancer
Viral Enteritis
Viral Hepatitis
Vitamin B12 Anemia
Colon Cancer Screening
Colorectal Cancer Screening
Fecal Impaction Removal
Gallbladder Scan
Hepatitis A Screening
Hepatitis B Virus Screening
Hepatitis C Virus Screening
Hepatitis Screening
Impedance Testing
Instrumental Diagnostic Evaluation for Dysphagia
Liver Function Test
pH Probe
  • View other providers who treat pH Probe
Screening Colonoscopy
Sigmoidoscopy
Ultrasound, Endoanal
Ultrasound, Esophageal
VAP Lipid Testing
Wireless pH Testing

Insurance Accepted

* Please verify this information when scheduling an appointment.
  • Empire Hospital
    Empire Blue Cross Blue Shield PPO
    Empire Hospital/Medical (Trad)
  • SimplyBlue/Simply Blue Plus PPO
    BluePPO HSA PPO
  • Elect Choice (Open Access) EPO
    Aetna HMO
    Open Choice PPO
    Choice Plus POS II
    Select
    Managed Choice (Open Access) POS
    Savings Plus of Metro, NY
    Premier Care Network Plus - Innovation Health
  • Anthem Blue Cross Blue Shield HMO
    Blue Preferred Plus POS
    Anthem Blue Cross Blue Shield PPO
  • Cigna PPO
    LocalPlus
    Open Access Plus
  • MVP Health Plan EPO
  • BlueCard PPO
  • Options PPO
    Choice Plus POS
    Navigate HMO
    Navigate Plus POS
  • First Health (Coventry Health Care) PPO
  • Freedom
    Liberty
  • Blue PPO
  • Blue Priority X Indiv DirectAccess - WI POS
    Blue Preferred - WI POS
  • Fidelis Care
  • MagnaCare PPO
  • HealthyBlue Advantage

Locations

  1. 1 Stony Brook Univ. Hosp. Ob. & GYN.
    3 Technology Dr Ste 300, East Setauket, NY 11733
    Icon Directions Right Arrow Directions Phone Icon (631) 444-5220
    Monday
    Closed
    Tuesday
    08:00 - 16:30
    Wednesday
    Closed
    Thursday
    Closed
    Friday
    Closed
    Saturday
    Closed
    Sunday
    Closed
  2. 2 BayCare Aurora LLC
    2845 Greenbrier Rd, Green Bay, WI 54311
    Icon Directions Right Arrow Directions Phone Icon (920) 288-8100
  3. 3 Advanced Specialty Care at Lake Grove
    4 Smith Haven Mall Ste 203, Lake Grove, NY 11755
    Icon Directions Right Arrow Directions Phone Icon (631) 444-5220
  4. 4 Stony Brook University Hospital
    101 Nicolls Rd, Stony Brook, NY 11794
    Icon Directions Right Arrow Directions Phone Icon (631) 444-5220

Patient Satisfaction

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About Me

Specialties*
Internal Medicine
Gastroenterology
Specialties*
  • *Sharecare does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.
Common Questions and Answers
Responses are sourced directly from patients.
Does Dr. Guillaume communicate via email?
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Does Dr. Guillaume have free onsite parking?
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Frequently Asked Questions

Find contact information here to make an appointment.

A list of accepted insurance providers is available on the Sharecare insurance check. It is always a good idea to verify your insurance when making an appointment.

New patients are generally accepted by Dr. Alexandra Guillaume, MD. To arrange an appointment, call the number on Dr. Guillaume's profile.

Dr. Guillaume frequently treats the following conditions: Gastrointestinal Malabsorption, Gas-Bloat Syndrome, Constipation, Abdominal Pain, Diarrhea and Esophageal Achalasia and Cardiospasm. See more on Sharecare.

Dr. Alexandra Guillaume, MD is affiliated with Stony Brook University Hospital and Ascension NE Wisconsin-St. Elizabeth Campus.

Yes, Dr. Alexandra Guillaume, MD holds board certification in Gastroenterology.

Education
Medical Education
  • Tufts University
    2006
Medical Education
Board Certifications
  • Gastroenterology
Board Certifications
What’s a board certification and why is it important that my provider has one?

A board certification represents a provider’s dedication to ongoing training in one or more specialties, including the completion of intensive exams. While not all specialties have board certifications, if your provider does have one they’ve taken the extra step to master their specialty and to keep up with the latest advancements in their field.

Hospital Affiliations

  • Stony Brook University Hospital

    101 Nicolls Rd, Stony Brook, NY

  • Ascension NE Wisconsin-St. Elizabeth Campus

    1506 S Oneida St, Appleton, WI

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