Adam Zachary Tillowitz, MD

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

MD21210 Issued in RI

Practice address

The GW Medical Faculty Associates
2150 Pennsylvania Ave
Washington, DC 20037

Phone

(202) 741-3000

NPI assigned

Apr 7, 2020

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Other names 1

• Adam Zachary Horowitz Former name

Medicare fee-for-service enrollment

Enrolled in RI

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

Gastroenterology

Education

Albert Einstein College of Medicine of Yeshiva University, 2020

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Interoperability endpoints

• Direct secure messaging: ahorowitz19386@gwmfa.direct-ci.com

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 Gastroenterology, LLC

  • Gastroenterology Physician
  • Providence, RI
  • NPI 1386952612
  Medicare reassignment NPD (past)

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

{
    "created_epoch": "1586217600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779062400000",
    "number": "1245869510",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 202230",
            "city": "DALLAS",
            "state": "TX",
            "postal_code": "753202230",
            "telephone_number": "401-421-8800"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "THE GW MEDICAL FACULTY ASSOCIATES",
            "address_2": "2150 PENNSYLVANIA AVE",
            "city": "WASHINGTON",
            "state": "DC",
            "postal_code": "20037",
            "telephone_number": "202-741-3000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "44 W River St",
            "address_purpose": "LOCATION",
            "city": "Providence",
            "state": "RI",
            "postal_code": "029042609",
            "country_code": "US",
            "telephone_number": "401-274-4800",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "TILLOWITZ",
        "first_name": "ADAM",
        "middle_name": "ZACHARY",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2020-04-07",
        "last_updated": "2026-05-18",
        "certification_date": "2026-05-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "RI",
            "license": "MD21210",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "ADAM",
            "last_name": "HOROWITZ",
            "middle_name": "ZACHARY",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Laura Cookman Tilley, MD
• Allen Tillman
• Ashley Keyona Tillman
• Christina Tillman
• Shaquita Tillman, LGPC
• Aquilla Tilman
• Tim Pineau, PH.D., PLLC
• Killian Lengha Tim
• Tercy Tim
• Api Redon Timah

• Gastroenterology Physician in Washington, DC
• Providers in Washington, DC by specialty
• Gastroenterology Physician in District of Columbia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 18, 2026; 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.