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GASTROENTEROLOGY ASSOCIATES, LLP
NPI 1740259647
Internal Medicine - Gastroenterology in Williamsville, NY

Active since March 14, 2006CLIA 33D0861881 · Waiver
60 MAPLE RD, STE 1, WILLIAMSVILLE, NY 14221(716) 626-5283(716) 332-2218 Get Directions Write a Review

NPPES record last updated: December 27, 2017. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Gastroenterology Associates, Llp NPPES

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

GASTROENTEROLOGY ASSOCIATES, LLP (NPI 1740259647) is a healthcare organization registered as a gastroenterology in Williamsville, New York and active in the NPI registry since March 2006. The organization holds a CLIA Waiver certificate valid through April 15, 2027 and lists Barbara A Fleissner, Credentialing Specialist, as its authorized official.

NPPES Registry Identity

NPI1740259647
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameGASTROENTEROLOGY ASSOCIATES, LLP
Location Address60 MAPLE RD, STE 1Williamsville, NY 14221-2917
Mailing Address60 Maple Rd, Ste 1Williamsville, NY 14221-2917 · (716) 626-5250 · Fax (716) 626-5316
Phone(716) 626-5283
Fax(716) 332-2218
Organization SubpartNo
Authorized OfficialBarbara A FleissnerCredentialing Specialist · (716) 626-5250
Enumeration DateMarch 14, 2006
Last NPPES UpdateDecember 27, 2017
✔ NPI 1740259647 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
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.
60 MAPLE RD, Williamsville, NY 14221
Open in Google Maps ↗

Other Identifiers 2

Medicaid02052606NY
Other2400834NY · Ghi

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Gastroenterology Associates, Llp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

25

Medicare enrollment records show 25 clinicians reassign Medicare billing to Gastroenterology Associates, LLP, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 25 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 2

Gastroenterology18
Nurse Practitioner7

Nearest to this location (20)

See all 25
Benjamin Schaus, D.O.
Gastroenterology
NPI 1891982450
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts MedicareSame address
Holly Bailey, NP
Nurse Practitioner
NPI 1518518174
462 GRIDER ST
Buffalo, NY 14215
(716) 204-3200
✔ PECOS✔ Accepts Medicare2.5 mi
Maura Anson, AGNP
Nurse Practitioner
NPI 1336939594
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Mallory Bischel, FNP
Nurse Practitioner
NPI 1073287728
60 MAPLE RD
Buffalo, NY 14221
(716) 626-5260
✔ PECOS✔ Accepts Medicare3.6 mi
Elizabeth Gregory
Gastroenterology
NPI 1801329511
60 MAPLE RD STE 1
Buffalo, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Cory Higley, DO, MPH
Gastroenterology
NPI 1629500053
60 MAPLE RD STE 1
Buffalo, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Craig Keller, M.D.
Gastroenterology
NPI 1831481365
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Ognian Pomakov, MD
Gastroenterology
NPI 1366583767
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Clark Zhang
Gastroenterology
NPI 1679034326
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Christopher Bartolone, M.D.
Gastroenterology
NPI 1548246788
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Peter Bloom, M.D.
Gastroenterology
NPI 1316923253
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
David Garson, M.D.
Gastroenterology
NPI 1457337388
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Ann Lillis, ANP
Nurse Practitioner
NPI 1609852607
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Yogesh Maheshwari, M.D.
Gastroenterology
NPI 1972589083
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Shahid Mehboob, MD
Gastroenterology
NPI 1588674428
60 MAPLE RD SUITE # 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Naima Mian, D.O.
Gastroenterology
NPI 1609066224
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Stanley Pietrak, M.D.
Gastroenterology
NPI 1396794939
60 MAPLE RD
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Siddhartha Shah, M.D.
Gastroenterology
NPI 1841276763
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Carrin Clifford, FNP-BC
Nurse Practitioner
NPI 1245945609
60 MAPLE RD
Williamsville, NY 14221
(716) 626-5250
✔ PECOS✔ Accepts Medicare3.6 mi
Jenna Perez
Nurse Practitioner
NPI 1679403265
60 MAPLE RD STE 1
Williamsville, NY 14221
(716) 626-5250
✔ PECOS3.6 mi
See all 25 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 33D0861881

Gastroenterology Associates LLP · Williamsville, NY
Active · expires Apr 15, 2027
CLIA Number33D0861881
Laboratory TypePhysician Office
Certificate Effective DateApril 16, 2025
Certificate Expiration DateApril 15, 2027
Laboratory DirectorDr. Christopher J. Bartolone
Laboratory Phone(716) 626-5250
Laboratory LocationGastroenterology Associates LLP60 Maple Road, Suite 1, Williamsville, NY 14221
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Gastroenterology Associates, LLP's NPI number?

The NPI number for Gastroenterology Associates, LLP is 1740259647. It was assigned to this organization in the NPPES registry on March 14, 2006.

Where is Gastroenterology Associates, LLP located?

Gastroenterology Associates, LLP is located at 60 Maple Rd Ste 1, Williamsville, NY 14221. The listed phone number is (716) 626-5283.

What is Gastroenterology Associates, LLP's specialty?

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

Is Gastroenterology Associates, LLP enrolled in Medicare?

Yes. Gastroenterology Associates, LLP is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Gastroenterology Associates, LLP?

According to the CMS Revalidation Reassignment List (October 2026 release), 25 clinicians in 2 Medicare specialties reassign their Medicare billing to Gastroenterology Associates, LLP. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Gastroenterology (18) and Nurse Practitioner (7). Of these, 1 practice at this address and 25 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Gastroenterology Associates, LLP hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 33D0861881) is associated with this NPI, valid through April 15, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Gastroenterology Associates, LLP was last updated on December 27, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.