Mason Lang, OD

Primary specialty

OptometristTaxonomy code 152W00000X

License

34493 Issued in CA

Practice address

30600 Dyer St
Union City, CA 94587-1717

Phone

(510) 431-3142

NPI assigned

Aug 27, 2018

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

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

Specialty

Optometry

Education

Other, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

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.

• Dr Mason Lang OD Inc

  • Optometrist
  • Union City, CA
  • NPI 1689333502
  Medicare reassignment NPD Authorized official

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

{
    "created_epoch": "1535328000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1752278400000",
    "number": "1407337439",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "500 PAWNEE PL",
            "city": "FREMONT",
            "state": "CA",
            "postal_code": "945393306",
            "telephone_number": "510-456-5848"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "30600 DYER ST",
            "city": "UNION CITY",
            "state": "CA",
            "postal_code": "945871717",
            "telephone_number": "510-431-3142"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LANG",
        "first_name": "MASON",
        "name_prefix": "Dr.",
        "credential": "OD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-08-27",
        "last_updated": "2025-07-12",
        "certification_date": "2025-07-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "152W00000X",
            "taxonomy_group": "",
            "desc": "Optometrist",
            "state": "NY",
            "license": "008867",
            "primary": false
        },
        {
            "code": "152W00000X",
            "taxonomy_group": "",
            "desc": "Optometrist",
            "state": "CA",
            "license": "34493",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Juliana Lainez, OTD, OTR/L
• Catherine Yuen Ying Lam
• Felicia Lam
• Har Hiu Dawn Lam, M.D.
• Lambert Javier Chiropractic, Inc
• Parisa Lanoue
• Jeemeng Lao
• Stephanie Adeline L Larchuleta Smith, M.S., CCC-SLP
• Emily Lateer, MS, OTR/L
• Joey Lau

• Optometrist in Union City, CA
• Providers in Union City, CA by specialty
• Optometrist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 12, 2025; 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.