NPIMap

Individual provider Active NPI

Warren Chow, MD

  • Hematology & Oncology Physician
  • Orange, CA
National Provider Identifier
1093822017
Registry record updated Mar 25, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Hematology & Oncology PhysicianTaxonomy code 207RH0003X
License
G61354 Issued in CA
Practice address
101 The City Dr S
Orange, CA 92868-3201
Phone
(714) 456-5153
Fax
(714) 456-5280
NPI assigned
Aug 24, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 25, 2025

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X G61354 CA
Medical Oncology Physician 207RX0202X G61354 CA
Hematology & Oncology Physician 207RH0003X G61354 CA Primary

Addresses

Primary practice location

101 The City Dr S
Orange, CA 92868-3201

Mailing address

200 S Manchester Ave Ste 300
Orange, CA 92868-3219
Phone (714) 456-2986

Other identifiers 1

IdentifierTypeStateIssuer
00G613540MedicaidCA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20110131000935 CA Practitioner - Medical OncologyPractitioner - Internal MedicinePractitioner - Hematology/Oncology 0840479267 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Medical OncologyAlso: Internal Medicine
Education
R Franklin University of Med & Sci/Chicago Medical School, 1986
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
UC RegentsGroup PAC ID 7416869516, 316 clinicians

Practice addresses (Care Compare)

101 The City Dr S
Orange, CA 92868-3201
Phone (714) 456-7004

Hospital & facility affiliations

  • Uci Health-Orange Hospital, Orange, CA, CCN 050348
  • City of Hope Helford Clinical Research Hospital Hospital, Duarte, CA, CCN 050146

Merit-based Incentive Payment System (MIPS)

Final score
100 of 100Reported as apm
Quality
83.7
Promoting interoperability
100
Improvement activities
40

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
G61354CAMDHematology & Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
UC Regents CurrentSince Aug 16, 2021 Accepting new patients
UC Regents Hematology & Oncology CurrentSince Aug 16, 2021 Accepting new patients
City of Hope Medical Foundation Hematology & Oncology CurrentSince Jun 1, 2011 Accepting new patients
UC Regents Current Accepting new patients
City of Hope Medical Group, Inc. Hematology & Oncology CurrentSince Jun 1, 2011 Accepting new patients
Providence Health System Southern California Past Accepting new patients
UC Regents Internal Medicine Past Accepting new patients
University of California Irvine Past Accepting new patients
California Cancer Specialists Medical Group Inc Hematology & Oncology Past Accepting new patients
Torrance Memorial Medical Center Past Accepting new patients
University of California Irvine Past Accepting new patients
Usc Arcadia Hospital Past Accepting new patients

Locations

1500 Duarte Rd
Bldg 149
Duarte, CA 91010
Phone (626) 359-8111

1500 Duarte Rd
Duarte, CA 91010
Phone (626) 359-8111

19208 Jamboree Rd
Irvine, CA 92612
Phone (657) 579-3460

101 The City Dr S
Orange, CA 92868
Phone (714) 456-6054

101 The City Dr S
Bldg 23
Orange, CA 92868
Phone (714) 456-5889

6939 Palm Ct
Riverside, CA 92506
Phone (760) 416-4832

209 Fair Oaks Ave
South Pasadena, CA 91030
Phone (626) 359-8111

23861 McBean Pkwy
Ste B14
Valencia, CA 91355
Phone (661) 799-1999

Interoperability endpoints

  • Direct secure messaging: wchow8522@cityofhope.direct-ci.com

Organizations & group practices 12

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.

Hospital & facility affiliations 3

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

NPI Registry JSON

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

{
    "created_epoch": "1156377600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1742860800000",
    "number": "1093822017",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "200 S MANCHESTER AVE STE 300",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683219",
            "telephone_number": "714-456-2986"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "101 THE CITY DR S",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683201",
            "telephone_number": "714-456-5153",
            "fax_number": "714-456-5280"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CHOW",
        "first_name": "WARREN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-08-24",
        "last_updated": "2025-03-25",
        "certification_date": "2025-03-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "G61354",
            "primary": false
        },
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "CA",
            "license": "G61354",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "CA",
            "license": "G61354",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00G613540",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Orange, CA

Sources for this page

Verify at the official NPI Registry.