Gregory Williamson, MD
NPI 1144780040 · Anesthesiology Physician · Pittsburgh, PA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Williamson, MD is a Anesthesiology Physician provider in Pittsburgh, PA (NPI 1144780040).
Provider details
- NPI number
- 1144780040
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD484869 (PA)
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
7 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-03-25
- Last updated
- 2025-04-08
- Certified
- 2025-04-08
Frequently asked questions
- What is Gregory Williamson's NPI number?
- Gregory Williamson's National Provider Identifier (NPI) is 1144780040, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Williamson's specialty?
- Gregory Williamson is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Williamson located?
- Gregory Williamson's practice location on file with NPPES is 4401 Penn Ave Ste 5643, Pittsburgh, PA 15224-1334.
- What is Gregory Williamson's phone number?
- The practice phone number listed in the NPPES registry for Gregory Williamson is (412) 692-5261.
- Does Gregory Williamson accept Medicare?
- Gregory Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Williamson's NPI active?
- Yes — Gregory Williamson's NPI (1144780040) is active in the NPPES registry as of the last update on 2025-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.