Robert C Messer

Primary specialty

Case Manager/Care CoordinatorTaxonomy code 171M00000X

Practice address

20001 Highway 108
Sonora, CA 95370-8422

Phone

(209) 588-6164

NPI assigned

Sep 14, 2026

Sex

Male

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": "1789344000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1789344000000",
    "number": "1679484398",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "19401 SUSAN WAY",
            "city": "SONORA",
            "state": "CA",
            "postal_code": "953709266",
            "telephone_number": "209-588-6164"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "20001 HIGHWAY 108",
            "city": "SONORA",
            "state": "CA",
            "postal_code": "953708422",
            "telephone_number": "209-588-6164"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MESSER",
        "first_name": "ROBERT",
        "middle_name": "C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2026-09-14",
        "last_updated": "2026-09-14",
        "certification_date": "2026-09-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "171M00000X",
            "taxonomy_group": "",
            "desc": "Case Manager/Care Coordinator",
            "state": "CA",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Lawrence Robert Mier, MD
• Jeffrey Scott Mika, DDS

• Case Manager/Care Coordinator in Sonora, CA
• Providers in Sonora, CA by specialty
• Case Manager/Care Coordinator in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 14, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.

Verify at the official NPI Registry.