John B. Simpson, M.D.

Primary specialty

Cardiovascular Disease PhysicianTaxonomy code 207RC0000X

License

G33266 Issued in CA

Practice address

2900 Whipple Ave
Suite 230
Redwood City, CA 94062-2843

Phone

(650) 306-2300

Fax

(650) 306-2336

NPI assigned

May 22, 2006

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

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1148256000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1356395263",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2900 WHIPPLE AVE",
            "address_2": "SUITE 230",
            "city": "REDWOOD CITY",
            "state": "CA",
            "postal_code": "940622843",
            "telephone_number": "650-306-2300",
            "fax_number": "650-306-2336"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2900 WHIPPLE AVE",
            "address_2": "SUITE 230",
            "city": "REDWOOD CITY",
            "state": "CA",
            "postal_code": "940622843",
            "telephone_number": "650-306-2300",
            "fax_number": "650-306-2336"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIMPSON",
        "first_name": "JOHN",
        "middle_name": "B.",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-22",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "CA",
            "license": "G33266",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• James Willis Simmons II, NP
• Katherine Ann Simon, O.D.
• Sachet S Simon
• Jacqueline Simoncini, RD CDE
• Kayla Mie Simonson
• Cathy Sims, C.A.T.C. 101776
• Theodora T Singer, LCSW
• Aman Deep Singh, M.D.
• Anjileen Singh, PH.D., BCBA-D
• Rahul Kumar Singh, O.D.

• Cardiovascular Disease Physician in Redwood City, CA
• Providers in Redwood City, CA by specialty
• Cardiovascular Disease Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; 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.