AHDAD ZIYAR, M.D., INC.
NPI 1124726989
Internal Medicine - Allergy & Immunology in Santa Ana, CA
About Ahdad Ziyar, M.d., Inc. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AHDAD ZIYAR, M.D., INC. (NPI 1124726989) is a healthcare organization registered as an allergy & immunology in Santa Ana, California and active in the NPI registry since February 2023. The organization lists Ahdad Ziyar, Physician, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ahdad Ziyar, M.d., Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Ahdad Ziyar, M.D., Inc., which bills Medicare for the services this clinician delivers.
Clinician (1)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Ahdad Ziyar, M.D., Inc.'s NPI number?
The NPI number for Ahdad Ziyar, M.D., Inc. is 1124726989. It was assigned to this organization in the NPPES registry on February 21, 2023.
Where is Ahdad Ziyar, M.D., Inc. located?
Ahdad Ziyar, M.D., Inc. is located at 801 N Tustin Ave Ste 605, Santa Ana, CA 92705. The listed phone number is (714) 584-9930.
What is Ahdad Ziyar, M.D., Inc.'s specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Allergy & Immunology, with taxonomy code 207RA0201X.
Is Ahdad Ziyar, M.D., Inc. enrolled in Medicare?
Yes. Ahdad Ziyar, M.D., Inc. is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Ahdad Ziyar, M.D., Inc.?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Allergy/Immunology) reassigns their Medicare billing to Ahdad Ziyar, M.D., Inc.. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Ahdad Ziyar, M.D., Inc. was last updated on November 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Ahdad Ziyar, M.d., Inc. · NPI 1124726989
Allergy & Immunology organization in Santa Ana, California. Organization record, active in the CMS NPPES registry since February 21, 2023.
## Identity
- **NPI:** 1124726989 (Entity type: Organization)
- **Enumerated:** February 21, 2023
- **Primary specialty:** Internal Medicine - Allergy & Immunology · taxonomy 207RA0201X
- **Organization subpart:** No
- **Authorized official:** Ahdad Ziyar, PHYSICIAN
## Practice location
- **Address:** 801 N TUSTIN AVE STE 605, Santa Ana, CA 92705-3610
- **Phone:** (714) 584-9930
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Allergy/Immunology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 28, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1124726989) · Data from the CMS NPPES public registry.