Shek on Gun, OD

Primary specialty

OptometristTaxonomy code 152W00000X

License

34445TLG Issued in CA

Practice address

528 E 1St St Ste B
Tustin, CA 92780-3346

Phone

(657) 757-2020

Fax

(657) 478-7761

NPI assigned

Oct 26, 2019

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

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.

• Shek on Gun OD Inc

  dba Central Orange County Optometry

  • Clinic/Center
  • Tustin, CA
  • NPI 1568208189
  Medicare reassignment NPD Authorized official
• Pamela I. Wu O.D. Inc.

  dba Spectrum Optometry

  • Optometrist
  • Irvine, CA
  • NPI 1235207127
  Medicare reassignment NPD

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

{
    "created_epoch": "1572048000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762473600000",
    "number": "1396388906",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "528 E 1ST ST STE B",
            "city": "TUSTIN",
            "state": "CA",
            "postal_code": "927803346",
            "telephone_number": "657-757-2020",
            "fax_number": "657-478-7761"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "528 E 1ST ST STE B",
            "city": "TUSTIN",
            "state": "CA",
            "postal_code": "927803346",
            "telephone_number": "657-757-2020",
            "fax_number": "657-478-7761"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GUN",
        "first_name": "SHEK ON",
        "credential": "OD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-10-26",
        "last_updated": "2025-11-07",
        "certification_date": "2025-11-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "152W00000X",
            "taxonomy_group": "",
            "desc": "Optometrist",
            "state": "CA",
            "license": "34445TLG",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Wei Yang Guan, PHARM.D.
• Carince Guardian
• Carlos Guerrero, PA-C
• Lizzette Guerrero
• Blanca Nely Guevara
• Anu Gupta, SLPA
• Daniel Douglas Gustafson, MFT
• Leslie Dianne Gustafson, MFT
• Gutierrez Chiropractic Inc
• Aalyah Gutierrez

• Optometrist in Tustin, CA
• Providers in Tustin, CA by specialty
• Optometrist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 7, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.