Highly recommend!! I’ve had the best experience with Dr. Ziyar and refuse to see anyone else. Where other specialists have failed me, Dr. Ziyar has given me hope again. I came in with a ton of questions and he has been very patient, accommodating, and knowledgeable throughout the entire process.

Ahdad Ziyar M.D. - Allergy, Asthma and Sinus Center
Ahdad Ziyar M.D. - Allergy, Asthma and Sinus Center at a glance
Google reviewers rate this allergist 4.9 out of 5 based on 85 reviews, frequently praising the doctor's thoroughness, clear communication, and patient attentiveness during allergy, asthma, and eczema testing. Customers also highlight the friendly front desk staff, short wait times, easy parking, and the effectiveness of treatments like sublingual immunotherapy. A minority of negative reviews criticize administrative practices, specifically regarding the refusal to provide test results via phone or portal and poor responsiveness to voicemail messages.
- Google rating: 4.9 out of 5 from 85 reviews (96% five-star).
- Reviews on this page: 85 Google reviews (78 with written comments, 4 with photos).
- Owner responses: the business replied to 0% of reviews.
- Most recent review: October 22, 2026.
- Service: Allergy Testing Clinic serving Garden Grove, California.
Data from Google, last updated October 25, 2026.
Photos
Customer reviews
Reviews from Google, shown as published (original wording, unedited).
Dr. Ziyar was very attentive and I could tell he truly cared. I’ve always hated seeing doctors and usually try to avoid when I can, but Dr.Ziyar was different. He wasn’t rushing me out to get to the next patient, he took his time and was very thorough analyzing my situation. He helped get my allergy testing done and looked into my eczema case better than any doctor I’ve had. He is very kind, attentive, and kept things straight with me. Which I truly appreciate and wish more doctors were like him. I will only be seeing him for any future visits. Highly recommend!
Excelente trato y atención
Friendly staff, short wait, knowledgeable doctor. Everything you want in a specialist.
Amazing doctor! He was very thorough and genuinely attentive to my concerns. The doctor took the tike to explain my treatment options after my environmental skin testing. They even offer Sublingual and I can already feel the difference!<br><br>I especially appreciated that they offer patch chemical testing for patients with eczema. It was very helpful in identifying possible allergens or irritants that may be contributing to skin flare ups.<br><br>Overall I felt well cared for and confident in the treatment plan. I would highly recommend!
Clean and well-maintained clinic. The assistant was very helpful and attentive, and the doctor provided clear, professional advice!
I have been treated with kindness and professionalism. My concerns were addressed 100%. I feel so much better now and highly recommend this doctor!
I had been dealing with a rash for years and couldn't figure out what was causing it. Ointments and other medications prescribed by other specialists wouldn't help long term. Through Dr. Ziyar's recommendation to do patch testing, we were finally able to identify that I'm allergic to nickel, fragrances, and a few other things. I'm honestly so grateful to finally have answers after dealing with this for so long. I strongly recommend Dr. Ziyar.<br><br>I recently had a follow up appointment with him and I'm grateful for the experience. I never felt rushed and he took his time to answer all my questions. I really appreciated how patient and thorough he was! Highly recommend!!!
Wonderful care. Leslie and Dr Zayar are phenomenal. Can't say enough. Had extensive testing for allergies. Was always treated with kindness and professionalism.
I had a highly frustrating and deeply unprofessional experience with this office regarding my son’s care. While the medical care itself might be standard, the administrative policies and front desk behavior are predatory and completely abnormal.After my son’s initial appointment, skin testing, and blood tests, this office refused to give us his test results over the phone or via a portal. Instead, they forced us to schedule and pay for a completely separate follow-up appointment with a co-pay just to be verbally told the results.It got worse when we decided to switch doctors. When I called to request a copy of his skin and blood test results, the front desk was actively unhelpful and combative. They claimed they couldn't give me the blood test results and told me I had to contact Quest Diagnostics directly—even though this office ordered the tests and had the records.To top it off, when I asked to leave a simple message for the doctor to clarify a confusing part of the results, the front desk told me I was "not allowed" to leave a message. They stated that the doctor would not call or message me back, and that I would have to schedule and pay for yet another entirely new appointment just to ask a quick question.Forcing parents into unnecessary paid appointments just to get basic clarity or access to their child's medical records is exploitative. I highly recommend finding an allergist whose front office practices basic continuity of care and respects patient rights.
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Business details
- Address: 801 N Tustin Ave #605, Santa Ana, CA 92705
- Phone: (714) 584-9930
- Website: ziyarallergy.com
- Service area: Garden Grove, CA