Maria O Ortiz Castillo, M.D.

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

A121001 Issued in CA

Practice address

100 W California Blvd
Pasadena, CA 91105-3010

Phone

(626) 397-8300

NPI assigned

Nov 11, 2010

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other names 1

• Maria Olivia Ortiz Castillo Professional name

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in CA, WA2 enrollments

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 2

Specialty

Internal Medicine

Education

University of California, Geffen School of Medicine, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

City of Hope Medical FoundationGroup PAC ID 3779751656, 964 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Red Star Home Health Care, Inc Home health agency, Burbank, CA, CCN 757338
• City of Hope Helford Clinical Research Hospital Hospital, Duarte, CA, CCN 050146

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ocastillo53301@cityofhope.direct-ci.com
• Direct secure messaging: direct@cityofhope.direct-ci.com

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.

• City of Hope Medical Foundation

  • Hematology & Oncology Physician
  • Duarte, CA
  • NPI 1871886366
  Medicare reassignment Care Compare group NPD
• Healthcare Partners Affiliates Medical Group

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1659312593
  Medicare reassignment NPD
• Multicare Health System

  • Neurological Surgery Physician
  • Tacoma, WA
  • NPI 1497766638
  Medicare reassignment NPD
• Healthcare Partners Affiliates Medical Group

  • Durable Medical Equipment & Medical Supplies
  • Murrieta, CA
  • NPI 1760057269
  NPD
• Healthcare Partners Affiliates Medical Group

  • Addiction Medicine (Internal Medicine) Physician
  • Tustin, CA
  • NPI 1891981502
  NPD
• Multicare Health System

  • Pediatrics Physician
  • Gig Harbor, WA
  • NPI 1225674963
  NPD
• Multicare Health System

  • Community/Retail Pharmacy
  • Spokane, WA
  • NPI 1396594875
  NPD
• Saint Agnes Medical Center

  • General Acute Care Hospital
  • Fresno, CA
  • NPI 1205845567
  NPD (past)
• Memorial Medical Group Inc

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

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• City of Hope National Medical Center

  • General Acute Care Hospital
  • Duarte, CA
  • NPI 1750358297
  Care Compare affiliation
• Red Star Home Health Care, Inc

  • Home Health Agency
  • Los Angeles, CA
  • NPI 1104490283
  Care Compare affiliation

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

{
    "created_epoch": "1289433600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784073600000",
    "number": "1811298516",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 512185",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900510185",
            "telephone_number": "626-256-4673"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 W CALIFORNIA BLVD",
            "city": "PASADENA",
            "state": "CA",
            "postal_code": "911053010",
            "telephone_number": "626-397-8300"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1414 S Grand Ave Ste 100",
            "address_purpose": "LOCATION",
            "city": "Los Angeles",
            "state": "CA",
            "postal_code": "90015",
            "country_code": "US",
            "telephone_number": "213-481-2200",
            "fax_number": "213-481-7023",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "880 S Atlantic Blvd",
            "address_2": "Suite 101",
            "address_purpose": "LOCATION",
            "city": "Monterey Park",
            "state": "CA",
            "postal_code": "917544700",
            "country_code": "US",
            "telephone_number": "626-281-6969",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1500 Duarte Rd",
            "address_purpose": "LOCATION",
            "city": "Duarte",
            "state": "CA",
            "postal_code": "910103012",
            "country_code": "US",
            "telephone_number": "626-256-4673",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ORTIZ CASTILLO",
        "first_name": "MARIA",
        "middle_name": "O",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2010-11-11",
        "last_updated": "2026-07-15",
        "certification_date": "2026-07-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A121001",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CA",
            "license": "A121001",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "direct@cityofhope.direct-ci.com",
            "affiliation": "Y",
            "affiliationName": "CITY OF HOPE MEDICAL FOUNDATION",
            "address_1": "1500 Duarte Rd",
            "city": "Duarte",
            "state": "CA",
            "country_code": "US",
            "postal_code": "910103012",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "MARIA",
            "last_name": "ORTIZ CASTILLO",
            "middle_name": "OLIVIA",
            "credential": "M.D.",
            "code": "2",
            "type": "Professional Name"
        }
    ]
}

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• Hospitalist Physician in Pasadena, CA
• Providers in Pasadena, CA by specialty
• Hospitalist Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 15, 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.
• 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.