William J. Flynn, MD

Medicare activity in 2024

Official CMS public-use data for William J. Flynn, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)119 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)119 services
3. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)40 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)15 services
5. Hospital discharge day management, 30 minutes or less (99238)14 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Arthritis63%
• Chronic kidney disease47%
• Ischemic heart disease45%
• Depression43%

Hospitals where William J. Flynn works

Medicare's Facility Affiliation Data lists William J. Flynn at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Erie County Medical CenterBuffalo, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330219

Practice locations

Addresses where William J. Flynn is enrolled with Medicare (CMS data updated October 2, 2026).

• 462 Grider StBuffalo, NY 14215 (716) 898‑3000

Group practices

Medicare enrollment lists William J. Flynn as a member of these groups (CMS data updated October 2, 2026).

• Erie County Medical Center Corporation319 clinicians in the group
• University at Buffalo Surgeons Inc40 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in New York →

Other general surgeons in Buffalo

Clinicians with the same Medicare primary specialty in Buffalo, NY — not a recommendation.

• Eleanor C. Fung, MD
• Timothy M. Adams, MD
• Thamer R. Qaqish, MD
• Sonya S. Noor, MD
• Alan R. Posner, MD
• Molly E. Moore, MD
• Sara Abou Azar, MD
• Gene Yang, MD

All general surgeons in Buffalo →

Other clinicians in Erie County Medical Center Corporation

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Julia G. Coniglio, CNA
• Kristen F. Phillips, CNA
• Amrit P. Singh, MD
• Eleanor C. Fung, MD
• Kara A. Woods, PA
• Abigail S. Green, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians