Alexandra Guillaume, MD
Gastroenterology Physician · East Setauket, NY
Alexandra Guillaume, MD is a gastroenterology physician with a practice address in East Setauket, New York, and NPI 1396981197, issued on Dec 29, 2008. Check the license (New York 254256, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Alexandra Guillaume
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 254256 NY
100756 WI
Self-reported in NPPES; status is on the state search - Practice location
- 3 Technology Dr, East Setauket, NY 11733
- Phone
- (631) 444-5220
- Enumerated
- Dec 29, 2008
- Record last updated
- Jun 30, 2023
- Fax
- (631) 444-5225
- Medicaid ID
- 100241776 WI
- Medicare enrollment
- Enrolled (PECOS I20160829001432); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,797 in New York → Look up another NPI →
Also registered at 3 Technology Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nancy Crowley, PTPhysical Therapist1992924880
- Lionel D'Souza, MDGastroenterology Physician1679733182
- Eric Deutsch, DPTOrthopedic Physical Therapist1487376182
- Eileen Duswalt-Agostino, M.S. P. T.Physical Therapist1851511877
- Peter Ells, M.D.Gastroenterology Physician1336174143
- Sienna Frank, DPTPhysical Therapist1548831878
Verify Alexandra Guillaume in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 254256Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average gastroenterology physician in 2024
450 Medicare Part D claims for 113 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims.
Most prescribed
- Pantoprazole Sodium69 claims
- Omeprazole62 claims
- Motegrity46 claims
- Linzess36 claims
- Creon23 claims
- Famotidine17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $676.19
9 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 3 group practices
- Ascension Medical Group-Fox Valley Wisconsin IncMenasha, WI
- Aurora Medical Group, Inc.Green Bay, WI
- Stony Brook Internists University Faculty Practice CorporationStony Brook, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexandra Guillaume among 1,797 gastroenterology physician records in New York
Alexandra Guillaume, MD is one of 1,797 gastroenterology physician records with a practice address in New York. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 62% of them.
- NPI issued2008 · 62% of these records are older, 31% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2006 · median 1999 among the 1,378 with a school on file
- Record last updated2023 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 gastroenterology physician records list a practice address in East Setauket
They are 20 of the 972 NPPES records with a practice address in East Setauket, and 1,797 gastroenterology physician records in New York.
All 1,797 in New York → Every provider in East Setauket → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Robert Baranowski, MDEast Setauket, NY 117331205892205
- Gary Bernstein, MDEast Setauket, NY 117331407813579
- Douglas Brand, M.D.East Setauket, NY 117331851326706
- Jonathan Buscaglia, MDEast Setauket, NY 117331124078589
- William Cohn, MDEast Setauket, NY 117331861459208
- Eugene Coman, MDEast Setauket, NY 117331497713887
- Peter Ells, M.D.East Setauket, NY 117331336174143
- Howard Keschner, MDEast Setauket, NY 117331871551879
Common questions
What is Alexandra Guillaume, MD's NPI number?
Alexandra Guillaume, MD's National Provider Identifier (NPI) is 1396981197, issued on Dec 29, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Alexandra Guillaume, MD located?
The NPPES record lists a practice address at 3 Technology Dr, East Setauket, NY, 11733. Phone: (631) 444-5220. Providers update this record themselves, so call before visiting.
How can I verify Alexandra Guillaume, MD's license?
NPPES lists New York license number 254256, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexandra Guillaume, MD prescribe under Medicare Part D?
In 2024, Alexandra Guillaume, MD had 450 Medicare Part D claims for 113 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.