Irene Kajiya Nagel, P.A.-C

Primary specialty

Surgical Physician AssistantTaxonomy code 363AS0400X

License

PA 15487 Issued in CA

Practice address

18035 Brookhurst St., Suite 1300
Fountain Valley, CA 92708

Phone

(657) 241-9440

Fax

(714) 665-4601

NPI assigned

Aug 21, 2006

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

Other names 1

• Irene Aiko Kajiya Former name

Electronic endpoints 2

Medicare fee-for-service enrollment

Enrolled in CA, CO, OR3 enrollments

Eligible to order & refer

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

Green means eligible to order or refer.

Enrollment records 3

Merit-based Incentive Payment System (MIPS)

Final score

87.17 of 100Reported as group

Quality

81.15

Promoting interoperability

100

Improvement activities

40

Cost

71.64

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: inagel324337@samhealth.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.

• Memorialcare Medical Foundation

  • Clinic/Center
  • Fountain Valley, CA
  • NPI 1205167350

  Physician Assistant

  Medicare reassignment NPD
• University Surgeons of Orange a Medical Group

  dba Regents of the University of California

  • Surgery Physician
  • Orange, CA
  • NPI 1407806904
  Medicare reassignment NPD
• Intermountain Medical Group Grand Junction, LLC

  • Orthopaedic Surgery Physician
  • Grand Junction, CO
  • NPI 1356765556
  Medicare reassignment
• Intermountain Medical Group Grand Junction, LLC

  dba DME - Wellington Neurosurgery Clinic

  • Durable Medical Equipment & Medical Supplies
  • Grand Junction, CO
  • NPI 1609737618
  NPD
• Intermountain Medical Group Grand Junction, LLC

  dba SMMG Pediatric Specialty

  • Pediatrics Physician
  • Grand Junction, CO
  • NPI 1871106054
  NPD
• Bristol Park Medical Group, Inc

  • Family Medicine Physician
  • Costa Mesa, CA
  • NPI 1043266760
  NPD (past)
• Orange Coast Memorial Medical Center

  • General Acute Care Hospital
  • Fountain Valley, CA
  • NPI 1497702575
  NPD (past)
• Saddleback Memorial Medical Center

  • Rehabilitation Hospital Unit
  • Laguna Hills, CA
  • NPI 1114967114
  NPD (past)
• Taro Yokoyama, M.D., a Professional Corporation

  dba Pacific Cardiothoracic Surgery Group

  • Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
  • Los Angeles, CA
  • NPI 1508912908
  NPD (past)
• University of California Irvine

  dba UCI Infusion Center

  • Infusion Therapy Clinic/Center
  • Irvine, CA
  • NPI 1417027475
  NPD (past)
• Usc Cardiothoracic Surgeon's

  • Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
  • Los Angeles, CA
  • NPI 1457364507
  NPD (past)
• Good Samaritan Hospital Corvallis

  dba Samaritan Cardiothoracic Surgery - Corvallis

  • Cardiovascular Disease Physician
  • Corvallis, OR
  • NPI 1801148861
  NPD (past)

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

{
    "created_epoch": "1156118400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1750982400000",
    "number": "1255447496",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "18035 BROOKHURST ST., SUITE 1300",
            "city": "FOUNTAIN VALLEY",
            "state": "CA",
            "postal_code": "92708",
            "telephone_number": "657-241-9440",
            "fax_number": "714-665-4601"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "18035 BROOKHURST ST., SUITE 1300",
            "city": "FOUNTAIN VALLEY",
            "state": "CA",
            "postal_code": "92708",
            "telephone_number": "657-241-9440",
            "fax_number": "714-665-4601"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "3640 NW Samaritan Dr Ste 120",
            "address_purpose": "LOCATION",
            "city": "Corvallis",
            "state": "OR",
            "postal_code": "973303738",
            "country_code": "US",
            "telephone_number": "541-768-5223",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "NAGEL",
        "first_name": "IRENE",
        "middle_name": "KAJIYA",
        "name_prefix": "Mrs.",
        "credential": "P.A.-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-08-21",
        "last_updated": "2025-06-27",
        "certification_date": "2025-06-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "OR",
            "license": "PA225076",
            "primary": false
        },
        {
            "code": "363AS0400X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Surgical",
            "state": "CA",
            "license": "PA 15487",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://memorialcare.org/fhir/api/FHIR/R4/",
            "affiliation": "Y",
            "endpointDescription": "MemorialCare FHIR Endpoint",
            "affiliationName": "MemorialCare Medical Foundation",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "FHIR",
            "address_1": "17360 Brookhurst St",
            "city": "Fountain Valley",
            "state": "CA",
            "country_code": "US",
            "postal_code": "927083720",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "inagel324337@samhealth.direct-ci.com",
            "affiliation": "N",
            "address_1": "3640 NW Samaritan Dr Ste 120",
            "city": "Corvallis",
            "state": "OR",
            "country_code": "US",
            "postal_code": "973303738",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "IRENE",
            "last_name": "KAJIYA",
            "middle_name": "AIKO",
            "credential": "P.A.-C",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Gihyun Myung
• Andrea S Nacca, PA
• Tiffany Nagai, MS
• Anne E Nagel, D.D.S.
• Chris D Nagel, DDS
• Vincent Nagel, D.D.S.
• Nahid Nasr MD Inc
• Bradley Najac
• Tomoko Nakamizo-Mukasa, M.A.
• Grace Harumi Nakamura, PA

• Surgical Physician Assistant in Fountain Valley, CA
• Providers in Fountain Valley, CA by specialty
• Surgical Physician Assistant in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 27, 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.