Clarissa Thannen, RD, LD

Primary specialty

Registered DietitianTaxonomy code 133V00000X

License

164025792 Issued in IL

Practice address

751 N Rutledge St Ste 1700
Springfield, IL 62702-4968

Phone

(217) 545-8000

NPI assigned

Sep 22, 2026

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

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

{
    "created_epoch": "1790035200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790035200000",
    "number": "1558273631",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "751 N RUTLEDGE ST STE 1700",
            "city": "SPRINGFIELD",
            "state": "IL",
            "postal_code": "627024968",
            "telephone_number": "217-545-8000"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "751 N RUTLEDGE ST STE 1700",
            "city": "SPRINGFIELD",
            "state": "IL",
            "postal_code": "627024968",
            "telephone_number": "217-545-8000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "THANNEN",
        "first_name": "CLARISSA",
        "credential": "RD, LD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2026-09-22",
        "last_updated": "2026-09-22",
        "certification_date": "2026-09-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "133V00000X",
            "taxonomy_group": "",
            "desc": "Dietitian, Registered",
            "state": "IL",
            "license": "164025792",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Registered Dietitian in Springfield, IL
• Providers in Springfield, IL by specialty
• Registered Dietitian in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 22, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.

Verify at the official NPI Registry.