Gregory Carter Williamson, MD
Anesthesiology Physician · Pittsburgh, PA
Gregory Carter Williamson, MD is an anesthesiology physician with a practice address in Pittsburgh, Pennsylvania, and NPI 1144780040, issued on Mar 25, 2019. Check the license (Pennsylvania MD484869, as entered in NPPES) on the Pennsylvania Department of State (PALS); the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Gregory Carter Williamson
- Credential
- MD
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- MD484869 PA
Self-reported in NPPES; status is on the state search - Practice location
- 4401 Penn Ave Ste 5643, Pittsburgh, PA 15224
- Phone
- (412) 692-5261
- Enumerated
- Mar 25, 2019
- Record last updated
- Apr 8, 2025
- Medicare enrollment
- Enrolled (PECOS I20251104004760); may accept Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 2019
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 2,481 in Pennsylvania → Look up another NPI →
Also registered at 4401 Penn Ave Ste 5643
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Carter Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD484869Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Gregory Carter Williamson among 2,481 anesthesiology physician records in Pennsylvania
Gregory Carter Williamson, MD is one of 2,481 anesthesiology physician records with a practice address in Pennsylvania. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2019, is newer than 88% of them.
- NPI issued2019 · 88% of these records are older, 10% newer
- In a Medicare fileNo · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2019 · median 2005 among the 1,720 with a school on file
- Record last updated2025 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
353 anesthesiology physician records list a practice address in Pittsburgh
They are 353 of the 28,866 NPPES records with a practice address in Pittsburgh, and 2,481 anesthesiology physician records in Pennsylvania. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2,481 in Pennsylvania → Every provider in Pittsburgh → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- James Acuff, MDPittsburgh, PA 152241225099757
- Lauri Adler, MDPittsburgh, PA 152241780656025
- Martin Anixter, MDPittsburgh, PA 152241134191521
- Richard Brickley, MDPittsburgh, PA 152241447224555
- Lawrence Collins, DOPittsburgh, PA 152241407847148
- Rup Dua, MDPittsburgh, PA 152241588637474
- Nghi Nguyen, MDPittsburgh, PA 152241629045083
- Mark Stypula, MDPittsburgh, PA 152241124014584
Common questions
What is Gregory Carter Williamson, MD's NPI number?
Gregory Carter Williamson, MD's National Provider Identifier (NPI) is 1144780040, issued on Mar 25, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Carter Williamson, MD located?
The NPPES record lists a practice address at 4401 Penn Ave Ste 5643, Pittsburgh, PA, 15224. Phone: (412) 692-5261. Providers update this record themselves, so call before visiting.
How can I verify Gregory Carter Williamson, MD's license?
NPPES lists Pennsylvania license number MD484869, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.