Ahdad Ziyar, M.D., Inc.
NPI 1124726989 · Allergy & Immunology (Internal Medicine) Physician · Santa Ana, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ahdad Ziyar, M.D., Inc. is a Allergy & Immunology (Internal Medicine) Physician organization in Santa Ana, CA (NPI 1124726989).
Provider details
- NPI number
- 1124726989
- Entity type
- Organization
- Primary specialty
- Allergy & Immunology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Ahdad Ziyar, Physician(213) 282-7603
Specialties & taxonomies
Allopathic & Osteopathic Physicians
- Internal Medicine Physician207R00000X
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-02-21
- Last updated
- 2025-11-28
- Certified
- 2025-11-28
Frequently asked questions
- What is Ahdad Ziyar, M.D., Inc.'s NPI number?
- Ahdad Ziyar, M.D., Inc.'s National Provider Identifier (NPI) is 1124726989, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Ahdad Ziyar, M.D., Inc.?
- Ahdad Ziyar, M.D., Inc. is classified in the NPPES registry as Allergy & Immunology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Ahdad Ziyar, M.D., Inc. located?
- Ahdad Ziyar, M.D., Inc.'s practice location on file with NPPES is 801 N Tustin Ave Ste 605, Santa Ana, CA 92705-3610.
- What is Ahdad Ziyar, M.D., Inc.'s phone number?
- The practice phone number listed in the NPPES registry for Ahdad Ziyar, M.D., Inc. is (714) 584-9930.
- Does Ahdad Ziyar, M.D., Inc. accept Medicare?
- Ahdad Ziyar, M.D., Inc. is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Ahdad Ziyar, M.D., Inc.?
- The authorized official listed on Ahdad Ziyar, M.D., Inc.'s NPPES record is Ahdad Ziyar, Physician. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Ahdad Ziyar, M.D., Inc.'s NPI active?
- Yes — Ahdad Ziyar, M.D., Inc.'s NPI (1124726989) is active in the NPPES registry as of the last update on 2025-11-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.