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GASTROENTEROLOGY ASSOCIATES LLP

PAC 8820048085 Physician group
GASTROENTEROLOGY · WILLIAMSVILLE, NY · hospital-affiliated
Specialty GASTROENTEROLOGY — most common member specialty (multi-specialty groups carry one label; see Methods)
Footprint Registered in WILLIAMSVILLE, NY · bills Medicare in 2 states (IL, NY)
Scale 28 providers on the CMS registry roster · 34 codes billed (five-year data window) · 6,000 services (all billed codes, CY2024)
Medicare paid $521K · across all billed codes, CY2024, attributed & disclosed
Affiliation Hospital-affiliated — at least one member holds a hospital affiliation in the CMS registry
Contact (716) 626-5250 — CMS registry listing
CMS Doctors & Clinicians registry · Medicare Part B physician/supplier claims · figures are attributed (single-group clinicians) and disclosed fee-for-service — a subset, never complete totals · group series shown over the most recent 5 years (rosters archived from 2019)
Group analytics

Who's billing in this group, plus the paid volume analytics · CY2024

Clinician makeup · CY2024
Physicians 16Advanced-practice 9Other clinicians 0= 25 clinicians billed · CY2024
By clinician headcount, CY2024. 'Physician' follows Medicare's §1861(r) definition (MD/DO, podiatry, optometry, dental medicine, chiropractic); facility and supplier enrollments are not counted as clinicians. These 25 are the clinicians who billed in CY2024 — a subset of the all-time registry roster shown on the group's identity card.

Billed 20 of the group's 34 codes this year, across 1 state (CY2024).

The full analytics for this group

Premium

The billed-volume rank, trajectory, and economics behind this group — computed on the same disclosed Medicare Part B data.

What Medicare paid this group in CY2024 is on the group's identity card — free, on every tier. Premium breaks that figure down per code and per service, and puts the volume behind it in national and peer context.

  • Per-code payment breakdown & avg $/service — dollars behind the volume
  • Beneficiary-episode volume — reach, not just service counts
  • Office vs. facility setting mix — place-of-service code split
  • National billed-volume rank — percentile, cohort & year disclosed
  • Size-peer billed-volume benchmark — vs. groups of similar size
  • Top-3 clinician share — how volume distributes
  • 5-year volume trend — direction across the window
  • Business mix — largest codes by payment

Rank and benchmark figures are billed-volume positions among peers, not measures of care. All figures attributed (single-group clinicians) and disclosed Medicare Part B fee-for-service.

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Medicare Part B FFS · CY2024 · as published by CMS
Data year: CY2024 CY2023 CY2022  CY2021  CY2020 

Provider volumes, all codes · CY2024

NPIProviderCredentialsTypeCitySt Services (all codes)
1457337388 Garson, David M.D. Gastroenterology WilliamsvilleNY
1073287728 Bischel, Mallory FNP Nurse Practitioner BuffaloNY
1972589083 Maheshwari, Yogesh M.D. Gastroenterology WilliamsvilleNY
1831481365 Keller, Craig M.D. Gastroenterology WilliamsvilleNY
1396794939 Pietrak, Stanley M.D. Gastroenterology WilliamsvilleNY
1841276763 Shah, Siddhartha M.D. Gastroenterology WilliamsvilleNY
1619253630 Hennesen, Pamela PA Physician Assistant WilliamsvilleNY
1518518174 Bailey, Holly NP Nurse Practitioner BuffaloNY
1609367804 Posner, Abigail PA Physician Assistant WilliamsvilleNY
1740245992 Ciechoski, Mary ANP Nurse Practitioner BuffaloNY
1700439015 Harvey, Emilee PA Physician Assistant BuffaloNY
1548246788 Bartolone, Christopher M.D. Gastroenterology WilliamsvilleNY
1316923253 Bloom, Peter M.D. Gastroenterology WilliamsvilleNY
1891982450 Schaus, Benjamin D.O. Gastroenterology WilliamsvilleNY
1609852607 Lillis, Ann ANP Nurse Practitioner WilliamsvilleNY
1316660509 Galluzzi, Alexandria PA-C Physician Assistant WilliamsvilleNY
1588674428 Mehboob, Shahid MD Gastroenterology WilliamsvilleNY
1003202615 Picano, John M.D. Gastroenterology WilliamsvilleNY
1245945609 Clifford, Carrin FNP-BC Nurse Practitioner WilliamsvilleNY
1609066224 Mian, Naima D.O. Gastroenterology WilliamsvilleNY
1588152706 Penn, Natalie MD Gastroenterology WilliamsvilleNY
1629500053 Higley, Cory DO, MPH Gastroenterology BuffaloNY
1801329511 Gregory, Elizabeth · member of 2 groups Gastroenterology BuffaloNY
1700266194 Malikowski, Thomas · member of 2 groups M.D. Gastroenterology WilliamsvilleNY
1366583767 Pomakov, Ognian · member of 2 groups MD Gastroenterology WilliamsvilleNY

Volumes are attributed to a group only for clinicians affiliated with exactly one group. Clinicians in several groups are listed ("member of N groups") but shown as "—" — their volume is not attributed to any single group. A "—" on a single-group clinician means CMS suppressed the figure (fewer than 11 beneficiaries), never zero. Beneficiary-episodes count CMS's per-setting beneficiary figures, not unique patients. Average Medicare payment is the amount Medicare actually paid per service, weighted by service volume across office and facility settings. Where the roster is a single clinician, that clinician's service counts match the group's attributed volume shown on the ranked results, so they are shown here; the per-provider split across a larger roster is a premium feature. See Methods & Sources.