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AHDAD ZIYAR
NPI 1205330685
Allergy & Immunology in Santa Ana, CA

Active since March 21, 2018PECOS Enrolled
91.94/100
CMS Quality Rating
801 N TUSTIN AVE STE 605, SANTA ANA, CA 92705(714) 584-9930 Get Directions Write a Review

NPPES record last updated: December 30, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 30, 2025, Nov 28, 2025, Nov 14, 2023 and 2 more (5 updates tracked since 2018).

About Ahdad Ziyar NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

AHDAD ZIYAR (NPI 1205330685) is an individual allergy & immunology provider in Santa Ana, California, licensed in California (A164647) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS and is a graduate of University Of Florida College Of Medicine (2018).

NPPES Registry Identity

NPI1205330685
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameAHDAD ZIYAR
Location Address801 N TUSTIN AVE STE 605Santa Ana, CA 92705-3610
Mailing Address801 N Tustin Ave Ste 605Santa Ana, CA 92705-3610 · (714) 584-9930 · Fax (714) 419-2809
Phone(714) 584-9930
Sole ProprietorNo
Medical School CMSUniversity Of Florida College Of MedicineGraduated 2018
Enumeration DateMarch 21, 2018
Last NPPES UpdateDecember 30, 20255 updates tracked since enumeration
NPPES CertifiedDecember 30, 2025
✔ NPI 1205330685 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
License✔ Licensed in CA · A164647
Definition
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
Also ListedInternal Medicine · Allergy & ImmunologyTaxonomy 207RA0201X · License A164647 (CA)
801 N TUSTIN AVE STE 605, Santa Ana, CA 92705
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ahdad Ziyar is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6406287093
PECOS Enrollment IDI20230614003553
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

5

Medicare enrollment records show Ahdad Ziyar reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ahdad Ziyar, M.D., Inc.
Same address
Allergy & Immunology
801 N TUSTIN AVE STE 605
Santa Ana, CA 92705
  • Reassigned Medicare billing, California enrollment
  • Medicare enrollment name: Ahdad Ziyar MD Inc
NPI 1124726989 (714) 584-9930
The Regents Of The University Of California-Irvine
3.8 mi
Hospitalist
101 THE CITY DR S BLDG 1
Orange, CA 92868
  • Reassigned Medicare billing, California enrollment
  • 250 clinicians in this Medicare group
NPI 1154479723 (714) 456-7002
Baz Allergy, Asthma & Sinus Center, Inc.
197 mi
Allergy
5410 W CYPRESS AVE, STE. 104
Visalia, CA 93277
  • Reassigned Medicare billing, California enrollment
  • 41 clinicians in this Medicare group
NPI 1215956396 (559) 713-1600
Permanente Medical Group Inc
341 mi
Internal Medicine
710 LAWRENCE EXPRESSWAY
Santa Clara, CA 95051
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1073606299 (408) 851-1000
Sutter Bay Medical Foundation
352 mi
Multi-Specialty
795 EL CAMINO REAL
Palo Alto, CA 94301
  • Reassigned Medicare billing, California enrollment
  • 4,479 clinicians in this Medicare group
NPI 1013950807 (650) 321-4121

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

91.94/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality95.63
Promoting Interoperability94
Improvement Activities40
Cost65.83

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221
DME-Other DME · category DE017N
3 suppliers29 claims92 services$18.26 avg. paid by Medicare
Injection, immune globulin (hizentra), 100 mg J1559
Treatment-Injections and Infusions (nononcologic) · category RI008N
2 suppliers14 claims5,880 services$9.58 avg. paid by Medicare
Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552
DME-Other DME · category DE000N
2 suppliers26 claims83 services$2.36 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

AHDAD ZIYAR, M.D., INC.
Internal Medicine (Allergy & Immunology)
801 N TUSTIN AVE STE 605
SANTA ANA, CA 92705
Orange County (714) 584-9930

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's NPI number?

The NPI number for Ahdad Ziyar is 1205330685. It was assigned to this individual provider in the NPPES registry on March 21, 2018.

Where is Ahdad Ziyar located?

Ahdad Ziyar practices at 801 N Tustin Ave Ste 605, Santa Ana, CA 92705. The listed phone number is (714) 584-9930.

What is Ahdad Ziyar's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Ahdad Ziyar enrolled in Medicare?

Yes. Ahdad Ziyar is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ahdad Ziyar's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ahdad Ziyar reassigns Medicare benefits to 5 organizations: Ahdad Ziyar, M.D., Inc. (Santa Ana, CA), The Regents Of The University Of California-Irvine (Orange, CA), Baz Allergy, Asthma & Sinus Center, Inc. (Visalia, CA), Permanente Medical Group Inc (Santa Clara, CA) and Sutter Bay Medical Foundation (Palo Alto, CA). Each 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 Ahdad Ziyar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ahdad Ziyar was last updated on December 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.