NPIMap

Individual provider Active NPI

Zachary Gerard O'Leary, PA-C

  • Physician Assistant
  • Castro Valley, CA
National Provider Identifier
1083298178
Registry record updated Nov 28, 2023
On this page

Key facts

NPPES NPI Registry
Primary specialty
Physician AssistantTaxonomy code 363A00000X
License
PA59454 Issued in CA
Practice address
20642 John Dr
Castro Valley, CA 94546-5103
Phone
(888) 924-1036
NPI assigned
May 6, 2021
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Nov 28, 2023

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Physician Assistant 363A00000X PA59454 CA Primary

Addresses

Primary practice location

20642 John Dr
Castro Valley, CA 94546-5103

Mailing address

20642 John Dr
Castro Valley, CA 94546-5103
Phone (888) 924-1036

Other practice location 1

5189 Hospital Rd
Mariposa, CA 95338-9524
Phone (907) 891-9941

Other names 1

  • Zack O'Leary Former name

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
I20210629001835 CA Practitioner - Physician Assistant 4082015920 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Physician Assistant
Education
Stanford University School of Medicine, 2021
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
University Healthcare AllianceGroup PAC ID 6305748799, 334 clinicians

Practice addresses (Care Compare)

20642 John Dr
Castro Valley, CA 94546-5103
Phone (888) 924-1036

27206 Calaroga Ave
Suite 105
Hayward, CA 94545-4300
Phone (888) 924-1036

4725 1St St
Suite 100
Pleasanton, CA 94566-7366
Phone (925) 462-7060

Hospital & facility affiliations

  • Stanford Health Care Hospital, Stanford, CA, CCN 050441
  • Stanford Health Care Tri-Valley Hospital, Pleasanton, CA, CCN 050283

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Physician Assistant

State licenses

LicenseStateTypeSpecialty
59454CAMDGeneral Practice Dentistry
PA59454CAMDPhysician Assistant

Practice roles

OrganizationSpecialtyStatusNew patients
Affinity Medical Group Past Accepting new patients

Interoperability endpoints

  • Direct secure messaging: zoleary222329@direct.stanfordhealthcare.org

Organizations & group practices 2

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 8

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": "1620259200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1701129600000",
    "number": "1083298178",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "20642 JOHN DR",
            "city": "CASTRO VALLEY",
            "state": "CA",
            "postal_code": "945465103",
            "telephone_number": "888-924-1036"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "20642 JOHN DR",
            "city": "CASTRO VALLEY",
            "state": "CA",
            "postal_code": "945465103",
            "telephone_number": "888-924-1036"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "5189 Hospital Rd",
            "address_purpose": "LOCATION",
            "city": "Mariposa",
            "state": "CA",
            "postal_code": "953389524",
            "country_code": "US",
            "telephone_number": "907-891-9941",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'LEARY",
        "first_name": "ZACHARY",
        "middle_name": "GERARD",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-05-06",
        "last_updated": "2023-11-28",
        "certification_date": "2023-11-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "CA",
            "license": "PA59454",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "ZACK",
            "last_name": "O'LEARY",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

Other providers in Castro Valley, CA

Sources for this page

Verify at the official NPI Registry.