Nathan Philip Seigrist, DO

Primary specialty

General Practice PhysicianTaxonomy code 208D00000X

License

OS23985 Issued in FL

Practice address

3 Saint Elizabeth Blvd Ste 4000
O Fallon, IL 62269-1284

Phone

(618) 256-9355

Fax

(618) 206-2332

NPI assigned

Feb 21, 2023

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 IL

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Interoperability endpoints

• Direct secure messaging: nathan.seigrist.1@9559.direct.athenahealth.com

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

{
    "created_epoch": "1676937600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782259200000",
    "number": "1780382465",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3 SAINT ELIZABETH BLVD STE 4000",
            "city": "O FALLON",
            "state": "IL",
            "postal_code": "622691284",
            "telephone_number": "618-256-9355",
            "fax_number": "618-206-2332"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3 SAINT ELIZABETH BLVD STE 4000",
            "city": "O FALLON",
            "state": "IL",
            "postal_code": "622691284",
            "telephone_number": "618-256-9355",
            "fax_number": "618-206-2332"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SEIGRIST",
        "first_name": "NATHAN",
        "middle_name": "PHILIP",
        "credential": "DO",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2023-02-21",
        "last_updated": "2026-06-24",
        "certification_date": "2026-06-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "171000000X",
            "taxonomy_group": "",
            "desc": "Military Health Care Provider",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "IL",
            "license": "125.084301",
            "primary": false
        },
        {
            "code": "208D00000X",
            "taxonomy_group": "",
            "desc": "General Practice",
            "state": "FL",
            "license": "OS23985",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• General Practice Physician in O Fallon, IL
• Providers in O Fallon, IL by specialty
• General Practice Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 24, 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.