You-Jen Chou, MD

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

A111307 Issued in CA

Practice address

1000 Fivepoint
Irvine, CA 92618-2621

Phone

(800) 826-4673

NPI assigned

Nov 8, 2008

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Other names 1

• Jim You-Jen Chou Professional name

Electronic endpoints 1

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

Specialty

GastroenterologyAlso: Internal Medicine

Education

Boston University School of Medicine, 2008

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

City of Hope Medical FoundationGroup PAC ID 3779751656, 964 clinicians

United Medical DoctorsGroup PAC ID 2961305651, 168 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• City of Hope Helford Clinical Research Hospital Hospital, Duarte, CA, CCN 050146
• Southwest Healthcare Rancho Springs Hospital Hospital, Murrieta, CA, CCN 050701
• Memorialcare Orange Coast Medical Center Hospital, Fountain Valley, CA, CCN 050678
• Hoag Memorial Hospital Presbyterian Hospital, Newport Beach, CA, CCN 050224

Merit-based Incentive Payment System (MIPS)

Final score

100 of 100Reported as group

Promoting interoperability

100

Improvement activities

40

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/9170/brand/1/csg/1/fhir/r4
• Direct secure messaging: jim.chou.1@9170.direct.athenahealth.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.

• United Medical Doctors

  • Gastroenterology Physician
  • Murrieta, CA
  • NPI 1770559981
  Medicare reassignment Care Compare group NPD
• City of Hope Medical Foundation

  • Hematology & Oncology Physician
  • Duarte, CA
  • NPI 1871886366
  Medicare reassignment Care Compare group
• United Medical Doctors

  • Orthopaedic Surgery Physician
  • San Diego, CA
  • NPI 1194554675
  NPD
• Orange Coast Memorial Medical Center

  • General Acute Care Hospital
  • Fountain Valley, CA
  • NPI 1497702575
  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
• Hoag Memorial Hospital Presbyterian

  • General Acute Care Hospital
  • Newport Beach, CA
  • NPI 1518951300
  Care Compare affiliation
• Orange Coast Memorial Medical Center

  • General Acute Care Hospital
  • Fountain Valley, CA
  • NPI 1497702575
  Care Compare affiliation
• Universal Health Services of Rancho Springs Inc

  • General Acute Care Hospital
  • Murrieta, CA
  • NPI 1245221050
  Care Compare affiliation

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

{
    "created_epoch": "1226102400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1777939200000",
    "number": "1104070887",
    "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"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 FIVEPOINT",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926182621",
            "telephone_number": "800-826-4673"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2100 Main St Ste 300",
            "address_purpose": "LOCATION",
            "city": "Huntington Beach",
            "state": "CA",
            "postal_code": "926482489",
            "country_code": "US",
            "telephone_number": "714-252-9415",
            "fax_number": "714-963-8407",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CHOU",
        "first_name": "YOU-JEN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2008-11-08",
        "last_updated": "2026-05-05",
        "certification_date": "2026-05-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "A111307",
            "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": "1000 Fivepoint",
            "city": "Irvine",
            "state": "CA",
            "country_code": "US",
            "postal_code": "926182377",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "JIM",
            "last_name": "CHOU",
            "middle_name": "YOU-JEN",
            "credential": "MD",
            "code": "2",
            "type": "Professional Name"
        }
    ]
}

• Bryant Chorn
• Anita Chou, D.D.S.
• Bing Chou
• Lungmei Chou
• Rebecca Chou
• Haerim Choun
• Alvin Hsu-Hui Chow, D.D.S
• Brenda Chow
• Creighton Stuart Chow, D.D.S.
• Edwin Chow, M.D

• Gastroenterology Physician in Irvine, CA
• Providers in Irvine, CA by specialty
• Gastroenterology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 5, 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.