ALEXANDRA GUILLAUME MD
NPI 1396981197
Internal Medicine - Gastroenterology in East Setauket, NY

Q: What is Alexandra Guillaume's NPI number?

The NPI number for Alexandra Guillaume is 1396981197. It was assigned to this individual provider in the NPPES registry on December 29, 2008.

Q: What is Alexandra Guillaume's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Active since December 29, 2008PECOS EnrolledAccepts Medicare Assignment

3 TECHNOLOGY DR, EAST SETAUKET, NY 11733(631) 444-5220(631) 444-5225 Get Directions Write a Review

NPPES record last updated: June 30, 2023. Verified against the NPPES registry weekly; last sync: August 16, 2026.

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About Alexandra Guillaume Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEXANDRA GUILLAUME MD (NPI 1396981197) is an individual gastroenterology provider in East Setauket, New York, licensed in New York (254256) and active in the NPI registry since December 2008. She is enrolled in Medicare PECOS, is affiliated with North Shore University Hospital, and is a graduate of Tufts University School Of Medicine (2006).

NPPES Registry Identity

NPI1396981197

Entity TypeIndividualFemale

Primary Taxonomy207RG0100X

Provider Legal NameALEXANDRA GUILLAUMECredential: MD

Location Address3 TECHNOLOGY DREast Setauket, NY 11733-4064

Mailing AddressPo Box 1554Stony Brook, NY 11790-0988 · (631) 444-0650 · Fax (631) 638-4170

Phone(631) 444-5220

Fax(631) 444-5225

Sole ProprietorNo

Medical School CMSTufts University School Of MedicineGraduated 2006

Enumeration DateDecember 29, 2008

Last NPPES UpdateJune 30, 2023

NPPES CertifiedJune 30, 2023

✔ NPI 1396981197 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

Licenses✔ Licensed in NY · 254256✔ Licensed in WI · 100756

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

3 TECHNOLOGY DR, East Setauket, NY 11733

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Other Identifiers 1

Medicaid100241776WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, CareSource (Common Ground Healthcare), Network Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alexandra Guillaume Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8426343591

PECOS Enrollment IDI20160829001432, I20230710002420

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 14

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Study of esophagus to assess movement 91010

This procedure, known as esophageal manometry, involves studying the esophagus or food pipe to evaluate its movement and pressure. It helps understand how well the esophagus can move food to the stomach. Involving a thin, flexible tube, it's a safe, minimally invasive test.

56 services55 patients

Monitoring and recording of esophageal function through nasal tube with electrode 91037

This procedure involves placing a thin tube with an electrode through your nose and into your esophagus. It helps to monitor and record the function of your esophagus, aiding in diagnosing any potential issues.

56 services55 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

45 services45 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

41 services40 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

39 services39 patients

Test for tone and sensation of rectum and anus 91120

This procedure checks the health of the lower digestive tract. The doctor gently examines the area to assess its muscle strength and sensitivity. This helps in detecting any abnormal conditions. It's a standard, safe procedure with minimal discomfort.

34 services34 patients

Study of rectum sensitivity and function 91122

This procedure examines the rectum's sensitivity and functionality. It involves a small, soft balloon inserted into the rectum and inflated to various degrees. The goal is to assess how well your rectum can sense and respond to different volumes. It's a crucial test for diagnosing certain digestive issues.

34 services34 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

26 services26 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

25 services25 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

22 services22 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

21 services21 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

15 services15 patients

Prolonged monitoring and recording of esophageal function through nasal tube with electrode 91038

This procedure involves the insertion of a thin, flexible tube through the nose into the esophagus. An electrode on the tube records esophageal activity over an extended period, helping to identify any functional issues.

13 services13 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

12 services12 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

North Shore University Hospital

Acute Care Hospitals · Manhasset, NY

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330106

Location300 Community DriveManhasset, NY 11030 · Nassau County

Emergency services Birthing friendly

Suny/Stony Brook University Hospital

Acute Care Hospitals · Stony Brook, NY

4/5 CMS rating

OwnershipGovernment - State

CMS Certification Number330393

LocationHealth Sciences Center SunyStony Brook, NY 11794 · Suffolk County

Emergency services Birthing friendly

Ascension NE Wisconsin - St Elizabeth Campus

Acute Care Hospitals · Appleton, WI

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520009

Location1506 S Oneida StAppleton, WI 54915 · Outagamie County

Emergency services Birthing friendly

Aurora Medical Ctr Oshkosh

Acute Care Hospitals · Oshkosh, WI

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520198

Location855 N Westhaven DriveOshkosh, WI 54904 · Winnebago County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11733 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$154.28 typical visit price

range $67.40 – $203.53

Typical copayment $38.57 (range $16.85 – $50.88)

Most-billed visit code 99204

Established Patient

$117.62 typical visit price

range $21.66 – $164.45

Typical copayment $29.40 (range $5.41 – $41.11)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 7

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Enteral feeding supply kit; syringe fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4034

Other-Enteral and Parenteral · category OB006N

2 suppliers11 claims277 services$2.05 avg. paid by Medicare

Enteral formula, manufactured blenderized natural foods with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4149

Other-Enteral and Parenteral · category OB006N

2 suppliers11 claims2,573 services$1.00 avg. paid by Medicare

Enteral formula, nutritionally complete with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4150

Other-Enteral and Parenteral · category OB006N

2 suppliers12 claims3,267 services$0.26 avg. paid by Medicare

Parenteral nutrition solution, not otherwise specified, 10 grams lipids B4185

Other-Enteral and Parenteral · category OB005N

2 suppliers36 claims1,144 services$10.59 avg. paid by Medicare

Parenteral nutrition solution; compounded amino acid and carbohydrates with electrolytes, trace elements, and vitamins, including preparation, any strength, 52 to 73 grams of protein - premix B4193

Other-Enteral and Parenteral · category OB005N

2 suppliers36 claims253 services$231.11 avg. paid by Medicare

Parenteral nutrition supply kit; premix, per day B4220

Other-Enteral and Parenteral · category OB005N

2 suppliers36 claims253 services$8.05 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 18

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ELLEN LI MD

Internal Medicine (Gastroenterology)

3 TECHNOLOGY DR
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

MS. CAROL ANN MARTIN NP

Nurse Practitioner (Adult Health)

3 TECHNOLOGY DR, SUITE 700
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

DR. EDWARD SUN MD

Internal Medicine

3 TECHNOLOGY DR, STONY BROOK INTERNISTS, UFPC
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

JOSEFINA VERGEL FNP-C

Nurse Practitioner (Family)

3 TECHNOLOGY DR
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

DR. PETER ELLS M.D.

Internal Medicine (Gastroenterology)

3 TECHNOLOGY DR
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

ASIM S KHOKHAR M.D.

Internal Medicine (Gastroenterology)

3 TECHNOLOGY DR
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

DR. BASIL RIGAS M.D.

Internal Medicine (Gastroenterology)

3 TECHNOLOGY DR
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

FARAH MONZUR MD

Internal Medicine (Gastroenterology)

3 TECHNOLOGY DR
EAST SETAUKET, NY 11733

Suffolk County (631) 444-5220

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Alexandra Guillaume's NPI number?

The NPI number for Alexandra Guillaume is 1396981197. It was assigned to this individual provider in the NPPES registry on December 29, 2008.

Where is Alexandra Guillaume located?

Alexandra Guillaume practices at 3 Technology Dr, East Setauket, NY 11733. The listed phone number is (631) 444-5220.

What is Alexandra Guillaume's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Alexandra Guillaume enrolled in Medicare?

Yes. Alexandra Guillaume is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Alexandra Guillaume accept?

Health plans from Anthem Blue Cross and Blue Shield, CareSource (Common Ground Healthcare) and Network Health list Alexandra Guillaume as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Alexandra Guillaume affiliated with any hospitals?

According to CMS data, Alexandra Guillaume is affiliated with North Shore University Hospital, Suny/Stony Brook University Hospital, Ascension NE Wisconsin - St Elizabeth Campus and Aurora Medical Ctr Oshkosh.

When was this NPI record last updated?

The NPPES record for Alexandra Guillaume was last updated on June 30, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.