Nathan James Simarro, D.D.S.

Primary specialty

Public Health DentistryTaxonomy code 1223D0001X

License

63666 Issued in CA

Practice address

5201 Deer Valley Road Suite #3B
Antioch, CA 94531

Phone

(925) 723-9090

NPI assigned

Jul 16, 2014

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

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

{
    "created_epoch": "1405468800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771372800000",
    "number": "1144637661",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5201 DEER VALLEY ROAD SUITE #3B",
            "city": "ANTIOCH",
            "state": "CA",
            "postal_code": "94531",
            "telephone_number": "925-723-9090"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5201 DEER VALLEY ROAD SUITE #3B",
            "city": "ANTIOCH",
            "state": "CA",
            "postal_code": "94531",
            "telephone_number": "925-723-9090"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIMARRO",
        "first_name": "NATHAN",
        "middle_name": "JAMES",
        "name_prefix": "Dr.",
        "credential": "D.D.S.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2014-07-16",
        "last_updated": "2026-02-18",
        "certification_date": "2026-02-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "122300000X",
            "taxonomy_group": "",
            "desc": "Dentist",
            "state": "CA",
            "license": "63666",
            "primary": false
        },
        {
            "code": "1223D0001X",
            "taxonomy_group": "",
            "desc": "Dentist, Dental Public Health",
            "state": "CA",
            "license": "63666",
            "primary": true
        },
        {
            "code": "1223G0001X",
            "taxonomy_group": "",
            "desc": "Dentist, General Practice",
            "state": "CA",
            "license": "63666",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Gregory Mark Silva, OD
• Gabriel Silveira
• Karen F Silverman, LCSW
• Jessica Silvestre
• Aden Sima
• Ryan Martin Simarro, D.M.D.
• Simkins Family Dentistry
• Mark F. Simkins, DDS
• Marsharel Simon
• Liana Simoni, NP

• Public Health Dentistry in Antioch, CA
• Providers in Antioch, CA by specialty
• Public Health Dentistry in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.