Aston Williams, MD
NPI 1558423921 · Gastroenterology Physician · Buffalo, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Aston Williams, MD is a Gastroenterology Physician provider in Buffalo, NY (NPI 1558423921).
Provider details
- NPI number
- 1558423921
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 158446 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 45 | 16 |
| Dicyclomine Hcl | 42 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 39 | 36 |
| Hydrochlorothiazide | 31 | — |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 30 | — |
| Amlodipine Besylate | 24 | — |
| Azithromycin | 21 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-14
- Last updated
- 2011-06-17
Frequently asked questions
- What is Aston Williams's NPI number?
- Aston Williams's National Provider Identifier (NPI) is 1558423921, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Aston Williams's specialty?
- Aston Williams is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Aston Williams located?
- Aston Williams's practice location on file with NPPES is 2804 Main St, Buffalo, NY 14214-1706.
- What is Aston Williams's phone number?
- The practice phone number listed in the NPPES registry for Aston Williams is (716) 832-1776.
- Does Aston Williams accept Medicare?
- Aston Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Aston Williams's NPI active?
- Yes — Aston Williams's NPI (1558423921) is active in the NPPES registry as of the last update on 2011-06-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.