What is Alexandra Guillaume's background?

Dr. Guillaume graduated from Tufts University School of Medicine in 2006 and has over 20 years in internal medicine. Dr. Guillaume works within a group practice.

Does Alexandra Guillaume take Medicare?

Dr. Guillaume has a Medicare provider ID. Contact the office to confirm enrollment and other coverage.

How do I reach Alexandra Guillaume's office?

3 Technology Dr, East Setauket, NY 11733. Phone: (631) 444-5220. Fax: (631) 444-5225. Virtual visits are also available for patients who prefer remote care.

How does a virtual visit with Dr. Guillaume work?

Dr. Guillaume's office sends a secure video link before your appointment. You can join from any device with a camera — phone, tablet, or laptop. Most visits take 15–30 minutes. See the telehealth section above for what to prepare.

Alexandra Guillaume, MD

Gastroenterology Internal Medicine

(631) 444-5220East Setauket, NY

Telehealth Available

NPI Active per CMS — Q2 2026

Telehealth Available NPI Active per CMS — Q2 2026

Alexandra Guillaume, MD specializes in internal medicine, serving patients in East Setauket, NY in group practice. A Tufts University School of Medicine graduate since 2006, she brings 20+ years of experience. Gastroenterologists diagnose and treat digestive system disorders including GERD, irritable bowel syndrome (IBS), and more.

1 of 564 Internal Medicine providers in NYSee all Internal Medicine in East Setauket|20+ years experience|NPI since 2008

Data updated 2023-06-30 on CMS NPPES

Contact & Location

Practice Location

3 Technology Dr, East Setauket, NY 11733-4064

(631) 444-5220

Fax: (631) 444-5225

Patient Reviews

No patient reviews yet. If you've seen Alexandra Guillaume, your feedback helps other patients.

Review PolicyAll feedback is moderated before publishing. We verify reviewer identity where possible and enforce a one-review-per-provider policy. Full guidelines →

Background & Specialty

Education, training, and specialty classification from CMS NPPES and Medicare records.

Internal MedicineAllopathic & Osteopathic Physicians

Gastroenterologists diagnose and treat digestive system disorders including GERD, irritable bowel syndrome (IBS), inflammatory bowel disease (Crohn's, ulcerative colitis), liver disease, pancreatitis, and colon polyps. They perform endoscopies and colonoscopies.

Taxonomy: 207RG0100X

Education & Training

Tufts University School of Medicine (Class of 2006)

Virtual Internal Medicine Care With Alexandra Guillaume

NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.

Schedule a virtual visit with Alexandra Guillaume for follow-ups, medication reviews, and ongoing care — no travel to East Setauket required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes.

Frequently Asked Questions

Common questions about Alexandra Guillaume

NPI records show Dr. Guillaume as active with telehealth listed in East Setauket, NY. Note: NPI status alone doesn't confirm open availability — always call ahead. Phone: (631) 444-5220.

Is this your profile?

Verify credentials, update practice details, and manage telehealth.

Claim Profile

Medical Disclaimer: NPI Telehealth is a provider directory for informational purposes only. This page does not constitute medical advice, diagnosis, or treatment recommendations. Provider data is sourced from the CMS NPPES federal registry and public Medicare datasets. NPI Telehealth does not verify clinical qualifications beyond federal records. Data may not reflect real-time availability — always contact the provider's office directly to confirm details before seeking care.

About NPI Telehealth Data Methodology Editorial Policy Report Inaccuracy