Healthcare Providers & Facilities in Williamsville, NY
Public healthcare directory of 3,540 individual practitioners and 551 healthcare facilities located in Williamsville, New York.
Medical Specialties in Williamsville
Select a specialty to view practitioner listings, practice locations, and qualifications.
Physician Assistant
Physical Therapist
Nurse Practitioner - Family
Family Medicine
Radiology - Diagnostic Radiology
Physician Assistant - Medical
Internal Medicine
Chiropractor
Nurse Anesthetist, Certified Registered
Nurse Practitioner - Adult Health
Anesthesiology
Nurse Practitioner
All Specialties in Williamsville
Specialties with enough public records for a comparison with U.S. figures, plus the 60 largest of 165 more with at least one listed practitioner. Number of practitioners in brackets.
Allopathic & Osteopathic Physicians
- Colon & Rectal Surgery (12)
- Dermatology (10)
- Emergency Medicine (13)
- Emergency Medicine - Emergency Medical Services (21)
- Family Medicine - Adult Medicine (4)
- General Practice (14)
- Hospitalist (5)
- Internal Medicine - Cardiovascular Disease (28)
- Internal Medicine - Endocrinology, Diabetes & Metabolism (13)
- Internal Medicine - Gastroenterology (34)
- Internal Medicine - Hematology & Oncology (14)
- Internal Medicine - Infectious Disease (4)
- Internal Medicine - Medical Oncology (6)
- Internal Medicine - Pulmonary Disease (14)
- Internal Medicine - Rheumatology (6)
- Neurological Surgery (14)
- Obstetrics & Gynecology (33)
- Ophthalmology (28)
- Orthopaedic Surgery (18)
- Otolaryngology (6)
- Pediatrics (30)
- Pediatrics - Adolescent Medicine (4)
- Pediatrics - Neonatal-Perinatal Medicine (5)
- Physical Medicine & Rehabilitation (12)
- Plastic Surgery (4)
- Psychiatry & Neurology - Neurology (9)
- Psychiatry & Neurology - Psychiatry (11)
- Radiology - Vascular & Interventional Radiology (5)
- Surgery (17)
Behavioral Health & Social Service Providers
Dental Providers
Dietary & Nutritional Service Providers
Eye and Vision Services Providers
Nursing Service Providers
Other Service Providers
- Acupuncturist (11)
- Case Manager/Care Coordinator (54)
- Specialist (49)
Pharmacy Service Providers
- Pharmacist (151)
Physician Assistants & Advanced Practice Nursing Providers
Podiatric Medicine & Surgery Service Providers
Respiratory, Developmental, Rehabilitative and Restorative Service Providers
Speech, Language and Hearing Service Providers
- Audiologist (16)
- Speech-Language Pathologist (84)
Student, Health Care
Featured Healthcare Providers in Williamsville
Practitioner profiles in Williamsville, NY with recent CMS Medicare or Open Payments data.
Dr. Polyxeni Mouhtouri Dimopoulos , MD
Obstetrics & Gynecology
Dr. Samuel Reyes , MD PHD
Otolaryngology
Amanda English , PA
Physician Assistant - Medical
Mark Kerner , PA
Physician Assistant - Surgical
Brooke Porto , PA
Physician Assistant
Dr. Benjamin Schaus , DO
Internal Medicine - Gastroenterology
Largest Cities in New York
Other New York cities with a full directory, by the number of active practitioners listed in NPPES.
How Williamsville compares with the U.S.
3,540 active clinicians list a practice address in Williamsville, NY in the NPI registry.
Williamsville has fewer than 10,000 residents, so rates per 100,000 people change a lot with each clinician and are not compared here.
96% of clinicians in Williamsville listed in the CMS Medicare file (1,024 of 1,072) accept Medicare assignment. That is higher than the New York share of 88%.
Only 1,072 of 3,540 active clinicians in Williamsville appear in the CMS Medicare file, so this share describes that smaller group.
What is Medicare assignment?
A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.
Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.
19% of clinicians in Williamsville listed in the CMS Medicare file (199 of 1,072) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than the New York share of 24%.
About the telehealth indicator
The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.
These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.
Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com · Methodology
Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File.
Williamsville CMS Healthcare & Financial Disclosures
CMS Part D Prescribers (2024), Open Payments (program year 2025), Medicare (PECOS) enrollment and Part B (2024) data for Williamsville, NY
Healthcare operations in Williamsville, NY encompass 3,540 active individual practitioners and 551 registered medical facilities across 189 clinical specialties.
According to CMS Medicare Part D analytics for 2024, prescription drug volume in Williamsville accounts for $327.1 Million across 1,493,474 prescription claims. 1,459 local practitioners have a Medicare (PECOS) enrollment record. Open Payments data for program year 2025 list $3.8 Million in payments reported by companies to 846 local practitioners; a reported payment does not necessarily mean the financial relationship is improper.