Individual provider Active NPI

Thomas P Williams, DDS

  • Dentist
  • Dubuque, IA
National Provider Identifier
1780678466
Registry record updated Mar 27, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
DentistTaxonomy code 122300000X
License
05935 Issued in IA
Practice address
100 Bryant St
Dubuque, IA 52003-7405
Phone
(563) 557-1440
Fax
(563) 557-7001
NPI assigned
Sep 8, 2005
Last updated
Mar 27, 2026By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Mar 27, 2026

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Dentist 122300000X 05935 IA Primary
Dentist 122300000X 23154 CA
Dentist 122300000X 5000989015 WI

Addresses

Primary practice location

100 Bryant St
Dubuque, IA 52003-7405

Mailing address

100 Bryant St
Dubuque, IA 52003-7405
Phone (563) 557-1440

Other identifiers 3

IdentifierTypeStateIssuer
0091009MedicaidIA
33570400MedicaidWI
09100OtherIABCBS DELTA DENTAL

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Not listed in the public Medicare enrollment file

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled

State licenses

LicenseStateTypeSpecialty
05935IAMDSocial Worker
5000989015WIMDDentist

Interoperability endpoints

  • Direct secure messaging: twilliams637393@direct.ochin.org

Organizations & group practices 1

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

NPI Registry JSON

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

{
    "created_epoch": "1126137600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774569600000",
    "number": "1780678466",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "100 BRYANT ST",
            "city": "DUBUQUE",
            "state": "IA",
            "postal_code": "520037405",
            "telephone_number": "563-557-1440",
            "fax_number": "563-557-7001"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 BRYANT ST",
            "city": "DUBUQUE",
            "state": "IA",
            "postal_code": "520037405",
            "telephone_number": "563-557-1440",
            "fax_number": "563-557-7001"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "THOMAS",
        "middle_name": "P",
        "credential": "DDS",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2005-09-08",
        "last_updated": "2026-03-27",
        "certification_date": "2026-03-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "122300000X",
            "taxonomy_group": "",
            "desc": "Dentist",
            "state": "IA",
            "license": "05935",
            "primary": true
        },
        {
            "code": "122300000X",
            "taxonomy_group": "",
            "desc": "Dentist",
            "state": "CA",
            "license": "23154",
            "primary": false
        },
        {
            "code": "122300000X",
            "taxonomy_group": "",
            "desc": "Dentist",
            "state": "WI",
            "license": "5000989015",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0091009",
            "state": "IA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "33570400",
            "state": "WI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BCBS DELTA DENTAL",
            "identifier": "09100",
            "state": "IA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Dubuque, IA

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 27, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.