Christian Gastelum MD | Endocrinologist | Whittier, CA | PIH Health
Christian John Gastelum

Christian John Gastelum MD


Endocrinology, Diabetes, & Metabolism
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4.8 / 5 (based on 404 Reviews) View 72 Comments
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Office Information

Hospital/Group Affiliation

PIH Health Downey Hospital

PIH Health Whittier Hospital

PIH Health Physicians





  • Endocrinology, Diabetes, & Metabolism

Additional Languages

  • Spanish


Medical School

Keck-USC School of Medicine


White Memorial Medical Center (California)


White Memorial Medical Center (California)


Cedars-Sinai Medical Center (California)

Charles R Drew Medical Center (California)

Board Certifications

  • Internal Medicine

Patient Reviews

June 08, 2022
I have been seeing Dr. Gastelum for several years now. He is a very competent and thorough physician who explains all the lab tests to me and tells me where I stand with my body chemistry. He keeps me on track with my medications and listens when I tell him what my insurance wants me to change. Yesterday (June 8, 2022) was a unique experience. On the 7th, I experienced a fall and am suffering with pain in my right side. Although Dr. Gastelum is a specialist in endocrinology, he took the time and made the effort to examine my side and back, and then he ordered an X-Ray to determine whether or not I have any injuries. I appreciate that extra bit of attention to my medical needs.
June 02, 2022
Dr Gastelum is amazing!! Highly recommended!!
June 02, 2022
a very good doctor
May 26, 2022
I really like the way he explains test results and what different things that are medically happening mean.
May 24, 2022
May 23, 2022
Great Doctor to have who shows he cares and was very informative with my diabetes game plan.
May 23, 2022
Dr. Gastelum and staff are very respectful and professional.
May 20, 2022
Great doctor.
May 20, 2022
Dr. Gastelum is seeing me & my wife.
May 19, 2022
I have seen this doctor for years and he is very attentive and professional, and so are his staff.
May 11, 2022
Dr Gastelum is always fantastic!
May 09, 2022
Dr. Gastelum seems very busy, and it seems like maybe he needs some more help. It just takes a long time to see him sometimes. That's all.
May 09, 2022
Highly Recommend Dr Gastelum!
May 06, 2022
I loved the doctor, the doctor is wonderful and the staff too, yes I can recommend him, thank you, okay.
May 06, 2022
They did a good job, and I'm very satisfied with your service. Thank you.
May 03, 2022
Dr. Gastelum is an amazing professional. He was able to squeeze my husband and I in to an appointment time so that we could make our other doctor's appointments. He's down to earth. He lets... he knows how to communicate with his patients. And he's just phenomenal at what he does.
May 03, 2022
Dr. Gastelum The Best
April 27, 2022
Dr. Gastelum and the staff did a good job. I really appreciate it. And I look forward to seeing him again. So I'm pleased with the service very much. Thank you. Bye.
April 27, 2022
The PIH specialists look only at the numbers from the tests they ordered. There is little consideration about anomalous symptoms ( I grow more tired, weak and dizzy), only their specialty. They do no hands-on examination or observation, only look at the computer. I feel as if in the last year they have been told to shorten their appointments, which they do. I virtually self-diagnose and self-medicate. This is not quality care. The CEO or CFO is responsible, not the physicians.
April 26, 2022
He was very considerate and patient and I would recommend him to other people as well.
April 26, 2022
I feel confident with the information we share. I trust Dr. G"s advise and medical knowledge about my diabetes.
April 21, 2022
Dr Gastelum was very courteous and helpful. He answered all of my concerns. Added much needed input on my A1c and high blood sugars. Looking forward to my next visit to see my results. I'm happy and excited.
April 11, 2022
Dr. Christian Gastelum was very thorough and very detailed and listen very well and remembered and retain the information. He was excellent diagnostician and comprehensive summary of the day that he did have available on me. Obviously a very knowledgeable endocrinologist and and caring medical doctor. I'm hoping that his interest and alacrity and care. And associative knowledge of integration of the data. And its implications on my health and my current treatment. Not just my current treatment with degree
April 05, 2022
Dr. Gastelum explains things in a language I can understand and helps me feel at ease and comfortable with my treatment plan.
April 05, 2022
My son is the Down's syndrome and dr. Shows respect as if he was normal. I respect him for that.
April 05, 2022
I am very happy to have Dr. Gastelum as my doctor.
March 14, 2022
I had a telehealth visit. Unfortunately, I was unable to connect with Dr. GASTELUM , and he was unable to connect with me through the link that was sent to me. We ended up connecting by phone. The telehealth process was a hassle in the fact that both of us were unable to connect online. This was very frustrating.
March 11, 2022
I love Dr. Gastelum he changed my life. Best doctor ever.
March 09, 2022
As always Dr Gastelum is the best doctor that I get to see at PIH. I trust him completely. I wish all doctors had his mannerism. They could learn a lot From him
February 22, 2022
Dr. Gastelum's a great doctor, and the experience is always very good. The one recommendation I would have is that they would update their phone system because at times, we have to wait for up to 10, 15 minutes, to get somebody on the phone if they could update it with a call back. Leave a call back number, that would be really appreciated because sometimes I just don't even want to call because I know I'm going to have to sit on hold for a really long time. Any time I call. Thank you.
February 17, 2022
Didn't like a phone or virtual appointment. I originally had a office appointment and the office changed the appointment. I feel the doctor can't really tell how you are doing without physically seeing you.
February 15, 2022
The office is very polite. The office is very clean, and they're efficient, and the doctor, of course, is a wonderful person. I didn't go in there for a while, and he's very efficient and helps us a lot and give suggestions. Like, you have another problem. He knows about it. He tells you, thank you.
February 10, 2022
Trying to get in hold with this office. There's really long hold times. Very consistently. So, for a full time, working individual. It challenging to get in touch with the office. Also. I had a referral for an ultrasound That was supposed to be done. And I was aware that this was going to be necessary, but no one contacted me to let me know that the referral has been approved or authorized or where to go. It wasn't until I received the authorization from my insurance that I have the information. But that was already a week before my appointment with the doctor. So I was not able to get an appointment in time with the ultrasound because they were booked for that whole week making my session with the
February 08, 2022
Ive been with Dr Gastelum for years After an Aortic dissection. He goes the extra mile to sure I get the care that I need
February 07, 2022
This was a phone, visit not an in person visit and I'm not equipped for a video presentation and holding the phone for as long as I had to as little bit inconvenient. So I will really be happy when we're seeing covid. Behind this. Thank you very much.
January 27, 2022
I had a great experience, he was caring and attentive to my health issues.
January 25, 2022
I prefer in person appointment
January 13, 2022
I still believe Senior Citizens should be seen in person. I understand why the Physicians can't too.
January 12, 2022
Dr. Gastelum's staff is very attentive and caring, and Dr. Gastelum himself is a very empathetic doctor and very up to date on the type of medicine that he does - the endocrinology - and his follow through is amazing. When he ordered lab or appointment, I always get information in the mail regarding that, and his staff is so helpful, and I would recommend anybody to see Dr. Gastelum.
January 12, 2022
Dr. Gastelum provided invaluable info that I wish I would have received years ago. He gave me lots of great information. He also gave me hope that I will be able to get my condition under control.
January 10, 2022
Hey, I really appreciate you getting feedback from us. I really love my doctor. And I hope that he doesn't leave. I've been following him since we've gone. Thank you.
December 16, 2021
Dr. Gastelum is the BEST!
December 15, 2021
I think on the first question, I accidentally pressed one. It should be a 4. He's excellent. I really appreciate him. He has stellar care, and I don't ever want to change from Dr. Gastelum. Thank you very much.
December 15, 2021
Dr. Gastelum is brilliant. All I can say is "keep him happy"
December 10, 2021
Kind and listens to my active imagination and figures out what I am really asking. lol.
December 09, 2021
For me he is an excellent person, a very professional, good doctor, is an excellence in the profession in which he leads, an endocrinologist, he is the best doctor of doctors. God bless him, and you too, thank you because he is an excellent doctor. Bye.
December 07, 2021
It was a great experience. Dr. Gastelum was very nice, very informed with me. The staff was nice and it was very enjoyable. Thank you very much.
December 02, 2021
Great doctor
November 30, 2021
Dr. Gastelum and his staffs are very courteous. He's very caring.
November 19, 2021
Thank you - both Dr. Gastelum and his office staff (namely, name removed and name removed) treated me like I was the most important patient there.... and I am aware that others feel the same way. Thank you!
November 18, 2021
Since I have started going with Dr. Gastelum I have felt better than I have ever felt going to my other doctor's. I wish there was a way where he could become my main doctor, instead of th,e other doctors. The other doctors have left me on medicines, for years instead of helping me. It has destroyed my health. Dr. Gastelum listens to me and he has helped me greatly. I would recommend him to anyone or any family member. And I don't know what else I can say about him, I am very happy with Dr.Gastelum my health has improved with him.
November 16, 2021
Dr. Gastelum and his office staff always genuinely and professionally assist his patients with outstanding medical care. Thank you.
November 16, 2021
Excellent care!
November 16, 2021
Dr. Gastellum and his staff were all kind and professional. I'm grateful for the care I receive at this office. [PHI removed]
November 11, 2021
Awesome caring Doctor Gastelum and Entire Staff. Thank you.
November 11, 2021
Dr Gastélum is always very attentive and curteous
November 09, 2021
The situation is, it's impossible to get a phone call into the office. Sometimes, I have to call the other office, and then they connect me to Wittier office, and I waited on the phone for hours, trying to get an appointment, or to talk to somebody... And, I also think the communication between the doctor, and his nurses. It's not very good. He tells me one thing, and then something else is presented to me by the nurses. So there you go. Thank you.
November 09, 2021
Great Dr. Always knows about the latest and greatest medicines and treatments.
November 08, 2021
Dr Gastelum is amazingly knowledgeable and fantastic to deal with. I have never dealt with a doctor as wonderful as him
November 04, 2021
Ohh, yes. I think this office could really improve in the answering of the telephone. You know, in a timely matter... Most of the time I end up hanging up, or driving to the office because I cannot you know, get through. I mean, I wait too long. And I can take care of it, if I just drive over there, and come back. So if they would answer their phone in the in the staff, that answers the phone take care of your questions or problems that you're having with something. Either a prescription, or something that you need to pick up that, you told the doctor. The doctors great, but I just don't care for the answering.
November 03, 2021
The front office was somewhat indifferent to me, the back office was nice & polite! I have been help by them for years.
October 27, 2021
Great doctor.
October 26, 2021
Doctor is professional knowledgeable patient passionate
October 26, 2021
Yes, I am satisfied with the care of the doctor it depended, yes I am satisfied with the attention the doctor with the doctor attended me and (unreadable). I thank you for your attention. Bye thank you.
October 25, 2021
Dr. Gastelum, take the time to explain everything he shows concerned for his patient. He's very professionalable, knowledgeable, very helpful, and he makes us feel like family. We appreciate Dr. Gastelum very much. He is the best.
October 20, 2021
Dr Gastelum is always full of knowledge and shares it with me according to my needs. I appreciate the time he takes to explain things to me. Thank you
October 19, 2021
Excellent health professional. Friendly, respectful, and cares about his patient. He takes the time to explain and listen to the patient's questions and concerns so that he understands the medication plan to follow.
October 14, 2021
Dr Gastelum is great. Not pushy and explains things in non-professional terms so it's understanding to the layman.
October 11, 2021
As always, we are seen promptly at this one office, where we don't really have to wait. And Dr. Gastelum does listen carefully, and he shows overall interest in everything about you. Everything that relates to any questions that you ask. He takes the time to answer. We are very happy and very satisfied with Dr. Gastelum's care. And the people in his office are very courteous and pleasant to work with.
October 08, 2021
Answered all my questions, and took his time and did not rush to finished
October 08, 2021
Dr. Gastelum was very concerned about my, my help. And I would definitely continue being seen by him.Thank you.
October 07, 2021
I appreciated that Doctor was thorough and up to date on the latest studies and treatments.
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