Ronald Castillo Tejada Jr., MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A118334 Issued in CA

Practice address

20920 Chico St
Carson, CA 90746-3603

Phone

(424) 444-5097

Fax

(833) 973-3630

NPI assigned

Sep 30, 2010

Sex

Male

Sole proprietor

Yes

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: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

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.

• Healthcare Partners Affiliates Medical Group

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1659312593
  Medicare reassignment NPD
• Healthcare Partners Affiliates Medical Group

  • Durable Medical Equipment & Medical Supplies
  • Murrieta, CA
  • NPI 1760057269
  NPD
• Jesse J Licuanan MD a Medical Corporation

  • Internal Medicine Physician
  • Lakewood, CA
  • NPI 1114218559
  NPD (past)
• Memorial Medical Group Inc

  • Durable Medical Equipment & Medical Supplies
  • Phoenix, AZ
  • NPI 1255523643
  NPD (past)

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

{
    "created_epoch": "1285804800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787702400000",
    "number": "1407165079",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3300 E SOUTH ST",
            "address_2": "SUITE 205",
            "city": "LAKEWOOD",
            "state": "CA",
            "postal_code": "908054549",
            "telephone_number": "562-531-0377",
            "fax_number": "562-531-1724"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "20920 CHICO ST",
            "city": "CARSON",
            "state": "CA",
            "postal_code": "907463603",
            "telephone_number": "424-444-5097",
            "fax_number": "833-973-3630"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TEJADA",
        "first_name": "RONALD",
        "middle_name": "CASTILLO",
        "name_prefix": "Dr.",
        "name_suffix": "Jr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2010-09-30",
        "last_updated": "2026-08-26",
        "certification_date": "2026-08-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A118334",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036130801",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mary Jane Tapia
• William Weiting Tarng, MD
• Tamara Tavai
• Lindsay Shawne Taylor, PA-C
• Ray Taylor, PT
• Meron G Tekelearegay, FNP
• Christine Florida Terasaki, PA-C
• Babra Chinwe Terry
• Textured Tech LLC
• Ta-Taneisha Thames

• Internal Medicine Physician in Carson, CA
• Providers in Carson, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 26, 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.