Gregory Carter Williamson, MD

Primary specialty

Anesthesiology PhysicianTaxonomy code 207L00000X

License

MD484869 Issued in PA

Practice address

4401 Penn Ave Ste 5643
Pittsburgh, PA 15224-1334

Phone

(412) 692-5261

NPI assigned

Mar 25, 2019

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in PA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Anesthesiology

Education

Pennsylvania State University College of Medicine, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

University of Pittsburgh PhysiciansGroup PAC ID 8729990239, 4,166 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• University of Pittsburgh Physicians

  • Gastroenterology Physician
  • Pittsburgh, PA
  • NPI 1619935004
  Medicare reassignment Care Compare group NPD
• University of Pittsburgh Physicians

  • Anesthesiology Physician
  • Pittsburgh, PA
  • NPI 1033125455
  NPD
• University of Pittsburgh Physicians

  • Diagnostic Radiology Physician
  • Pittsburgh, PA
  • NPI 1285692699
  NPD
• Upmc Emergency Medicine Inc

  • Emergency Medicine Physician
  • Pittsburgh, PA
  • NPI 1891744041
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1553472000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1744070400000",
    "number": "1144780040",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4401 PENN AVE",
            "city": "PITTSBURGH",
            "state": "PA",
            "postal_code": "152241334"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4401 PENN AVE STE 5643",
            "city": "PITTSBURGH",
            "state": "PA",
            "postal_code": "152241334",
            "telephone_number": "412-692-5261"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMSON",
        "first_name": "GREGORY",
        "middle_name": "CARTER",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-03-25",
        "last_updated": "2025-04-08",
        "certification_date": "2025-04-08",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "PA",
            "license": "MD484869",
            "primary": false
        },
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "PA",
            "license": "MD484869",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "CHP@upmcdirect.com",
            "affiliation": "N",
            "address_1": "4401 Penn Ave Ste 5643",
            "city": "Pittsburgh",
            "state": "PA",
            "country_code": "US",
            "postal_code": "152241334",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Thomas James Williams, MD
• Valaree M Williams, R.D.
• Veronica Frances Williams, PA-C
• Victoria Lynn Williams, PHARMD
• Batsheva J Williamson, CD DONA
• Patience Roy'Al Williamson
• Sean Daniel Williamson, CRNA
• Simone Aleta Williamson
• Victoria Guazzelli Williamson
• Cierra Willie-Johnson, NCC

• Anesthesiology Physician in Pittsburgh, PA
• Providers in Pittsburgh, PA by specialty
• Anesthesiology Physician in Pennsylvania

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 8, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.