Physician Profile
Alexandra Guillaume, MD
Unclaimed ProfileAbout Dr. Guillaume
Alexandra Guillaume, MD is a healthcare provider in East Setauket, NY specializing in gastroenterology. Alexandra trained at Tufts University School of Medicine, graduating in 2006. Alexandra is also listed as specializing in student in an organized health care education program. Medicare claims data shows Alexandra provided 439 services to 436 patients. The services billed most often include monitoring and recording of esophageal function through nasal tube with electrode, study of esophagus to assess movement, and biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope. This provider record is associated with NPI 1396981197.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (631) 444-5220
- Email not available
Practice Locations
3 TECHNOLOGY DR
East Setauket, NY 11733
2845 Greenbrier Rd
Green Bay, WI 54311
Conditions Commonly Evaluated or Treated
Within Gastroenterology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
Lower endoscopy
Upper endoscopy
Capsule and physiology testing
Diagnostic Testing
Liver procedures
Treatments
Procedures Most Often Billed to Medicare
439 services · 436 patients · 14 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
45 | As often as other peers in Gastroenterology |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
39 | As often as other peers in Gastroenterology |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
22 | Less often than most peers in Gastroenterology |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
21 | As often as other peers in Gastroenterology |
| Monitoring and recording of esophageal function through nasal tube with electrode | Treatment | 91037 |
56 | More often than most peers in Gastroenterology |
| Study of esophagus to assess movement | Treatment | 91010 |
56 | More often than most peers in Gastroenterology |
| Study of rectum sensitivity and function | Treatment | 91122 |
34 | More often than most peers in Gastroenterology |
| Test for tone and sensation of rectum and anus | Treatment | 91120 |
34 | More often than most peers in Gastroenterology |
| Prolonged monitoring and recording of esophageal function through nasal tube with electrode | Treatment | 91038 |
13 | Less often than most peers in Gastroenterology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
41 | Less often than most peers in Gastroenterology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other gastroenterologists at this location 8
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other gastroenterologists in East Setauket 4
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Tufts University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2006 at Tufts University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 8
Providers in NY who bill this service to Medicare most often.
Common questions
What is Dr. Guillaume's specialty?
Dr. Guillaume is a gastroenterologist in East Setauket, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where can I find Dr. Guillaume?
Dr. Guillaume is listed at 3 Technology Dr, East Setauket, NY 11733. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Guillaume?
The number on file is (631) 444-5220. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Guillaume?
Dr. Guillaume's National Provider Identifier is 1396981197. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Guillaume's medical education?
Dr. Guillaume attended Tufts University School of Medicine, graduating in 2006. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Guillaume have?
Dr. Guillaume has 20 years experience. Calculated from a graduation year of 2006, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Guillaume known for?
According to Medicare billing data, Dr. Guillaume performs procedures including biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope, removal of polyps or growths of large bowel using an endoscope with mechanical snare and biopsy of large bowel using a flexible endoscope; provides treatments such as monitoring and recording of esophageal function through nasal tube with electrode and study of esophagus to assess movement, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Guillaume's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Guillaume. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.