Ahdad Ziyar

Primary specialty

Allergy & Immunology PhysicianTaxonomy code 207K00000X

License

A164647 Issued in CA

Practice address

801 N Tustin Ave Ste 605
Santa Ana, CA 92705-3610

Phone

(714) 584-9930

NPI assigned

Mar 21, 2018

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Electronic endpoints 2

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

Allergy/ImmunologyAlso: Internal Medicine

Education

University of Florida College of Medicine, 2018

Medicare assignment

May accept Medicare assignment

Group practices

Permanente Medical Group IncGroup PAC ID 8921910225, 10,928 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Kaiser Foundation Hospital - Downey Hospital, Downey, CA, CCN 050139

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations (25 of 43)

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

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.

• Ahdad Ziyar, M.D., Inc.

  • Allergy & Immunology (Internal Medicine) Physician
  • Santa Ana, CA
  • NPI 1124726989
  Medicare reassignment NPD Authorized official
• Permanente Medical Group Inc

  • Internal Medicine Physician
  • Santa Clara, CA
  • NPI 1073606299
  Medicare reassignment Care Compare group NPD
• Baz Allergy, Asthma & Sinus Center, Inc.

  • Allergy Physician
  • Fresno, CA
  • NPI 1710906995
  Medicare reassignment NPD
• Sutter Bay Medical Foundation

  dba Palo Alto Medial Foundation

  • Multi-Specialty Clinic/Center
  • Palo Alto, CA
  • NPI 1013950807
  Medicare reassignment NPD
• The Regents of the University of California-Irvine

  dba UC Irvine Hospitalist Program

  • Hospitalist Physician
  • Orange, CA
  • NPI 1154479723
  Medicare reassignment NPD
• Baz Allergy, Asthma & Sinus Center

  • Allergy Physician
  • Clovis, CA
  • NPI 1396328779
  NPD
• Baz Allergy, Asthma & Sinus Center, Inc.

  • Allergy Physician
  • Hanford, CA
  • NPI 1023037108
  NPD
• Permanente Medical Group Inc

  • Internal Medicine Physician
  • Stockton, CA
  • NPI 1548343510
  NPD
• Permanente Medical Group, Inc

  • Clinical Medical Laboratory
  • San Jose, CA
  • NPI 1497971584
  NPD
• Sutter Bay Medical Foundation

  dba Sutter Pacific Medical Foundation

  • Multi-Specialty Clinic/Center
  • Sacramento, CA
  • NPI 1003267196
  NPD
• Sutter Bay Medical Foundation

  dba Palo Alto Medical Foundation

  • Clinical Medical Laboratory
  • Santa Clara, CA
  • NPI 1669287033
  NPD
• Glenn Medical Center, LLC

  dba Glenn Medical Center

  • Critical Access Hospital
  • Willows, CA
  • NPI 1619929759
  NPD (past)

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

• Kaiser Foundation Hospitals

  dba Kaiser Foundation Hospital - Downey

  • General Acute Care Hospital
  • Downey, CA
  • NPI 1518012301
  Care Compare affiliation

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

{
    "created_epoch": "1521590400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767052800000",
    "number": "1205330685",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "801 N TUSTIN AVE STE 605",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927053610",
            "telephone_number": "714-584-9930",
            "fax_number": "714-419-2809"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "801 N TUSTIN AVE STE 605",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927053610",
            "telephone_number": "714-584-9930"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ZIYAR",
        "first_name": "AHDAD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-03-21",
        "last_updated": "2025-12-30",
        "certification_date": "2025-12-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RA0201X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Allergy & Immunology",
            "state": "CA",
            "license": "A164647",
            "primary": false
        },
        {
            "code": "207K00000X",
            "taxonomy_group": "",
            "desc": "Allergy & Immunology",
            "state": "CA",
            "license": "A164647",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "SOAP",
            "endpointTypeDescription": "SOAP URL",
            "endpoint": "https://careepicwest.kp.org:14430/Interconnect-prodcalgateway/wcf/epic.community.hie/xcpdrespondinggatewaysync.svc/scalceq",
            "affiliation": "Y",
            "endpointDescription": "Carequality",
            "affiliationName": "Southern California Permanente Medical Group",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "C-CDA",
            "address_1": "9333 Imperial Hwy",
            "city": "Downey",
            "state": "CA",
            "country_code": "US",
            "postal_code": "902422812",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "SOAP",
            "endpointTypeDescription": "SOAP URL",
            "endpoint": "https://careepicwest.kp.org:14430/Interconnect-prodcalgateway/wcf/epic.community.hie/xcpdrespondinggatewaysync.svc/ncalceq",
            "affiliation": "N",
            "endpointDescription": "Carequality",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "C-CDA",
            "address_1": "1011 Riverside Ave",
            "city": "Roseville",
            "state": "CA",
            "country_code": "US",
            "postal_code": "956785134",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Linda Zimbelman - L.M.F.T., M.A., L.M.F.T
• Robert K Zimmer, D.D.S.
• Christopher Martin Zimmerman, MD, MPH
• Samantha Zimmerman, N.P.
• Frederick Oskar Zinnemann
• Elaine Zoberman-Saltiel, M.D.
• Zocalo Medical Group Ca
• Ayman Ayoub Zraiqat, DDS
• Karlie Zuckerman
• Lily Judith Zumaeta, MS RD

• Allergy & Immunology Physician in Santa Ana, CA
• Providers in Santa Ana, CA by specialty
• Allergy & Immunology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 30, 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.