Tarcisio C. Diaz, M.D.

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900 S Main St
Corona, CA 92882
Dr. Diaz is a board-certified physician bringing more than 30 years of experience to his Corona practice. He specializes in endocrinology, diabetes, metabolism, hormones, testosterone, thyroid issues, and adrenal issues. Dr. Diaz has a true passion for medicine, continues to educate himself on the latest medical updates in his field, and has co authored several research studies.

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2.517 reviews
Luke B.
8/19/2025

I previously left a 1 star review because I couldnt recieve any of my prescriptions. The front desk lady was extremely helpful and kind!

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Jennifer M.
12/5/2024

Went to an appointment at 0900 this morning. Dr. Diaz came into the office at 0930. 2 people were ahead of me. I watched one of the 2 people go home then they brought me back to the room. I sat...

Isabelle C.
8/6/2024

I love Dr. Diaz he is very kind and patient. You can tell he's very knowledgeable and knows what he's doing! The only downside to coming here is that the phones aren't working and even when I...

Ginny L.
6/5/2024

Dr is great but the staff is awful. They don't care. They don't act like they care. They don't know what they're doing. They're unresponsive. I cringe thinking of going in there and dealing with...

Ayn M.
3/18/2024

I like the doctor a lot, he really listens to your concerns and good at educating his patients but the staff is horrible. They never call back even after multiple messages. This clinic would be so...

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