Quick answers
- Does Andrew F. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Andrew F. Williams accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Andrew F. Williams see?
- In 2024, CMS data shows 114 Original Medicare patients and 235 services for Andrew F. Williams. This counts Original Medicare only and measures volume, not quality.
- What is Andrew F. Williams's NPI number?
- 1154365286. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Andrew F. Williams, 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.
| Original Medicare patients | 114 |
|---|---|
| Services billed to Medicare | 235 |
| Different services or procedures | 26 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Hemoglobin a1c level (83036)79 services
- Urinalysis, manual test (81002)24 services
- Routine electrocardiogram (ecg) using at least 12 leads with tracing (93005)24 services
- Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen (87635)16 services
- Insertion of needle into vein for collection of blood sample (36415)15 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 cholesterol72%
- Diabetes46%
- Arthritis39%
- Ischemic heart disease25%
- COPD25%
Hospitals where Andrew F. Williams works
Medicare's Facility Affiliation Data lists Andrew F. Williams 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.
- Canton-Potsdam HospitalPotsdam, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330197
- Carthage Area Hospital, IncOgdensburg, NY · Critical Access Hospital · Emergency services: listed by Medicare · CCN 331324
- Gouverneur HospitalGouverneur, NY · Critical Access Hospital · Emergency services: listed by Medicare · CCN 331315
- SLHS Massena, IncMassena, NY · Critical Access Hospital · Emergency services: listed by Medicare · CCN 331322
Practice locations
Addresses where Andrew F. Williams is enrolled with Medicare (CMS data updated October 2, 2026).
- 4 Commerce LnCanton, NY 13617 (315) 386‑8191
Group practices
Medicare enrollment lists Andrew F. Williams as a member of this group (CMS data updated October 2, 2026).
- United Cerebral Palsy Association of the North Country Inc32 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Other clinicians in United Cerebral Palsy Association of the North Country Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Rochester School Of Medicine And Dentistry |
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154365286 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians