NPIMap

Individual provider Active NPI

William Oh, M.D.

  • Colon & Rectal Surgery Physician
  • Irvine, CA
National Provider Identifier
1598100323
Registry record updated May 7, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Colon & Rectal Surgery PhysicianTaxonomy code 208C00000X
License
A136780 Issued in CA
Practice address
16405 Sand Canyon Ave Ste 280
Irvine, CA 92618-3792
Phone
(949) 557-0370
Fax
(949) 557-0370
NPI assigned
May 7, 2013
Last updated
May 7, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on May 7, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Colon & Rectal Surgery Physician 208C00000X A136780 CA Primary

Addresses

Primary practice location

16405 Sand Canyon Ave Ste 280
Irvine, CA 92618-3792

Mailing address

PO Box 781076
Detroit, MI 48278-1076
Phone (317) 528-4800

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA, WA2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20190927001873 CA Practitioner - Colorectal Surgery (Proctology) 4082960737 Reassigns benefits to 1 organization
I20211025003116 WA Practitioner - General Surgery 4082960737 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Colorectal Surgery (Proctology)
Education
Other, 2013
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Hoag ClinicGroup PAC ID 3274872064, 447 clinicians

Practice addresses (Care Compare)

1 Hoag Dr
Newport Beach, CA 92663-4162

1031 Avenida Pico
Suite 204
San Clemente, CA 92673-6352
Phone (949) 829-5533

16405 Sand Canyon Ave
Suite 200
Irvine, CA 92618-3786
Phone (949) 383-4190

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy17

National Provider Directory

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

Practice roles

OrganizationSpecialtyStatusNew patients
Multicare Health System CurrentSince Jul 17, 2021 Accepting new patients
Multicare Health System CurrentSince Jul 17, 2021 Accepting new patients
Multicare Health System Current Accepting new patients
Hoag Clinic CurrentSince Jan 1, 2024 Accepting new patients
Newport Harbor Radiology Associates Medical Group, Inc Past Accepting new patients
Multicare Health System Past Accepting new patients
Hoag Memorial Hospital Presbyterian Past Accepting new patients
Hoag Hospital Past Accepting new patients
Multicare Health System Past Accepting new patients
Multicare Health System Past Accepting new patients

Locations

16305 Sand Canyon Ave
Ste 260
Irvine, CA 92618
Phone (949) 360-0300

16405 Sand Canyon Ave
Ste 280
Irvine, CA 92618
Phone (949) 557-0251

500 Superior Ave
Ste 100
Newport Beach, CA 92663
Phone (949) 706-3300

1031 Avenida Pico
Ste 204
San Clemente, CA 92673
Phone (949) 829-5533

4700 Point Fosdick Dr
Ste 104
Gig Harbor, WA 98335
Phone (253) 459-7590

222 State Ave N
Kent, WA 98030
Phone (253) 372-7680

315 S K St
Tacoma, WA 98405
Phone (253) 403-1291

Interoperability endpoints

  • FHIR API: https://api.platform.athenahealth.com/10944/brand/3/csg/1/fhir/r4
  • FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/

Organizations & group practices 10

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 2

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": "1367884800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778112000000",
    "number": "1598100323",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 781076",
            "city": "DETROIT",
            "state": "MI",
            "postal_code": "482781076",
            "telephone_number": "317-528-4800"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "16405 SAND CANYON AVE STE 280",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926183792",
            "telephone_number": "949-557-0370",
            "fax_number": "949-557-0370"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OH",
        "first_name": "WILLIAM",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2013-05-07",
        "last_updated": "2026-05-07",
        "certification_date": "2026-05-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208C00000X",
            "taxonomy_group": "",
            "desc": "Colon & Rectal Surgery",
            "state": "CA",
            "license": "A136780",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Irvine, CA

Sources for this page

Verify at the official NPI Registry.