Karen To, OD

Primary specialty

OptometristTaxonomy code 152W00000X

License

OD35428-TLG Issued in CA

Practice address

1673 Branham LN
San Jose, CA 95118-5211

Phone

(408) 269-6861

Fax

(408) 269-6863

NPI assigned

Aug 16, 2022

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Ban H. Huynh O.D. Inc.

  • Optometrist
  • San Jose, CA
  • NPI 1427209063
  NPD
• Keith D. Chow, O. D., Inc.

  • Optometrist
  • San Jose, CA
  • NPI 1679525760
  NPD (past)

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

{
    "created_epoch": "1660608000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775174400000",
    "number": "1245958347",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1673 BRANHAM LN",
            "city": "SAN JOSE",
            "state": "CA",
            "postal_code": "951185211",
            "telephone_number": "408-269-6861",
            "fax_number": "408-269-6863"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1673 BRANHAM LN",
            "city": "SAN JOSE",
            "state": "CA",
            "postal_code": "951185211",
            "telephone_number": "408-269-6861",
            "fax_number": "408-269-6863"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TO",
        "first_name": "KAREN",
        "name_prefix": "Dr.",
        "credential": "OD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2022-08-16",
        "last_updated": "2026-04-03",
        "certification_date": "2026-04-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "152W00000X",
            "taxonomy_group": "",
            "desc": "Optometrist",
            "state": "CA",
            "license": "OD35428-TLG",
            "primary": true
        },
        {
            "code": "152W00000X",
            "taxonomy_group": "",
            "desc": "Optometrist",
            "state": "WA",
            "license": "OD61312562",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• An Ngoc To, M.D.
• Angela To, R.D.
• Harrison To, CPED
• Hue My To, DDS
• Jessica Sue To
• Marciana Marie To
• Nhung Thi To
• Pandora Eve To
• Quelan To, PHARM.D.
• Rick Minh-Luan To, M.D.

• Optometrist in San Jose, CA
• Providers in San Jose, CA by specialty
• Optometrist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 3, 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.