Dwight W Guan, MD

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

G59004 Issued in CA

Practice address

999 San Bernardino Rd
Upland, CA 91786-4920

Phone

(909) 985-2811

Fax

(818) 587-2493

NPI assigned

Jul 20, 2006

Last updated

Sep 11, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 3

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1153353600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1184644676",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 4419",
            "city": "WOODLAND HILLS",
            "state": "CA",
            "postal_code": "913654419",
            "telephone_number": "818-340-9988",
            "fax_number": "818-587-2493"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "999 SAN BERNARDINO RD",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "917864920",
            "telephone_number": "909-985-2811",
            "fax_number": "818-587-2493"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GUAN",
        "first_name": "DWIGHT",
        "middle_name": "W",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-20",
        "last_updated": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "G59004",
            "primary": false
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "CA",
            "license": "G59004",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE SHIELD",
            "identifier": "00G590040",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "P00247098",
            "state": "CA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00G590040",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Nicolaas Martin Grobler Jr., MD
• Audry Grooms, RD
• Ryan Grosjean, LMFT
• Grove Division
• Lorelle Grove
• Guardian Hospice Inc (Guardian Pharmacy)
• Silvia Guerra, M.S.
• Andre V Guerrero Fernandes, MD, DDS
• Elizabeth Guerrero
• Vivian Guerrero, SLPA

• Family Medicine Physician in Upland, CA
• Providers in Upland, CA by specialty
• Family Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; 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.