Christian John Gastelum

Christian John Gastelum MD

Specialties:

Endocrinology, Diabetes, & Metabolism and Internal Medicine
View Location
4.9 / 5 (based on 250 Reviews) View 64 Comments
  • Group

Make an Appointment

562.789.5447

Schedule an Appointment

Office Information

Hospital/Group Affiliation

PIH Health Downey Hospital

PIH Health Whittier Hospital

PIH Health Physicians

Profile

Gender

Male

Specialties

  • Endocrinology, Diabetes, & Metabolism
  • Internal Medicine

Additional Languages

  • Spanish

Education

Medical School

Cedars-Sinai Medical Center (California)

Charles R Drew Medical Center (California)

Keck-USC School of Medicine

White Memorial Medical Center (California)

Board Certifications

  • Endocrinology, Diabetes and Metabolism

Patient Reviews

December 30, 2025
Dr G was professional and well versed in his field of diabetes I felt cared for and that he assembled a plan to move forward to control my sugar
December 18, 2025
Good attitude friendly
December 16, 2025
Dr. Gastelum is the Best!!
December 09, 2025
Dr. Gastelum is an expert in his and related field. He is a caring and helpful physician.
October 30, 2025
a very good doctor!!!
October 22, 2025
Appointments with any physician is always so far out (2 months), which is concerning when the need to see a doctor is sooner than later. Not sure why this is...
October 20, 2025
Yes, hi. It was a great experience. The staff was awesome. Dr. Gastelum or Dr. (name removed), I guess I'll call him, explained everything thoroughly. I was, yeah, I was very, very impressed by him. So definitely recommend him. Thank you very much. Have a good day.
October 02, 2025
While the provider promised to direct the staff to give a specific lab order. I realized it was not the case. Luckily, I checked, asked and waited for the right lab order.
September 30, 2025
IT WAS A GREAT EXPERIENCE, DR. GASTELUM SPENT A GREAT DEAL OF TIME WITH ME, HE WAS VERY FRIENDLY AND KIND
September 16, 2025
Excellent Doctor!
September 11, 2025
Staff were very nice and helpful. Doctor Gastelum reviewed my blood work and explained in detail how to use medication.
September 03, 2025
Dr Gastelum is very easy to talk to and he listens to everything i have to say, and also gives me suggestions and lets me know how well i am doing with my progress
August 27, 2025
Dr. Gastelum is a great doctor, he listens to your concerns, explains everything in detail and is so personable. I only wish that his staff were more caring and helpful, especially the receptionist. She is not friendly or helpful.
August 25, 2025
Best doctor ever. I love this doctor. Takes his time. Staff is wonderful. Everything about this experience was wonderful. I completely trust him. I'm very happy. Very happy. I would recommend this. Keep doing what you're doing. Thank you.
August 25, 2025
1. I was not clear on medicaiton dosage 2. I tried to call several times and the phone doesn't go through or the message goes unanswered 3. my appt was scheduled 1 hour before I was seen. 4. I had questions and he was already leaving the room.
August 14, 2025
Dr Christian Gastelum is a Remarkably Knowledgeable Endocrinologist who helps guide me to Optimum Choices for Excellent Heath, and has helped me navigate through challenging Health issues to Good and Stable health!! His direction and guidance have saved me from making erroneous Choices -that would have been deleterious to my Health (Unknowingly) - so I am Grateful for his Medical Education of me on Difficult Choices that have been presented to me! He Explains the medical outcomes projected for different choices or procedure ! I am deeply Grateful For Dr Christian Gastelum's Current - State of the Art Knowledge and Treatment for Optimum Health! He is current on The most Recent Data and studies in his Field ! I highly recommend this doctor! (PHI removed)
August 05, 2025
Dr. Gastelum takes time with you. He's very patient and really cares about the patients. He's a very kind person and good doctor too.
July 31, 2025
Dr Gastelum is great!
July 24, 2025
Dr. Gastelum is a great doctor, who spends time with you and offers options for my care.
July 23, 2025
All the staff, including the doctor, were extremely friendly and professional.
July 02, 2025
It is always a pleasure to deal with Dr. Gastelum. He is professional and personable. I truly appreciate him and his medical guidance.
July 01, 2025
Dr. Gastelum not only made me feel seen and heard, but seemed much more knowledgeable about gender affirming hormone therapy. I hope to continue seeing him for as long as I need endocrinology care.
June 30, 2025
Dr. Gastelum is an endocrinologist who is primarily treating me for my diabetes. However, like many of my other PIH Health Physician doctors, they treat the whole person. They are willing to advise me on several things. Dr. Gastelum took the time and effort to look up a food item that was recommended to me by another provider and then counsel me on how it affects my calcium level, which apparently is too high right now. He told me to lay off certain foods for a while so he can figure out how to get my calcium level back down to normal. I appreciate the time Dr. Gastelum spent with me yesterday. His staff also took part in my treatment, and I appreciate them.
June 25, 2025
Doctor is always on time for appts. and listens to my concerns. Provides information that helps with my symptoms & provides guidance.
June 11, 2025
Wonderful doctor & staff
June 09, 2025
Parking needs to be validated. It's not right to charge patients for parking.
June 05, 2025
I was seem one hour after my appointment time. Very disappointed that I had to wait so long and the staff did not inform me that he was running behind.
June 03, 2025
Dr. Christian Gastelum is a very, very knowledgeable physician. I really like him because, again, he explains everything in detail form. He answers all my questions. He allows me, he's very receptive, so he listens to my concerns and then provides me professional and very accurate feedback on my medical condition. I am extremely happy with him. He is, again, very knowledgeable. I don't see anything uh... any improvement for the doctor uh... the only improvement that i would suggest is the uh... the when we call the office uh... the the response time from the office staff is very slow and so that i'd i'd recommend that there should be improvement when we call it just takes forever than for them to get back to us uh... that's the only improvement but otherwise the doctor is excellent about stuff is excellent and they just need to work on getting back to their patients.
June 02, 2025
Great doctor who provided information and answers to my questions about weight loss medication!
June 02, 2025
Seeing that he misgendered me in the consult letter was disappointing and demoralizing.
May 29, 2025
The staff was very professional and attentive, I have no complaints about it.
May 23, 2025
Great doctor and listens and addresses all my concerns. Always a great experience!
May 22, 2025
He takes his time to diagnose issues.
May 21, 2025
Always a pleasure to interact with the medical and other staff members of this office. I recommend Dr. Gastelum to friends and family often.
May 19, 2025
I always have a good experience with Dr. Gastelum. I have been his patient for a long time. He's great!!!
May 14, 2025
Very satisfied I will continue with his care.
May 05, 2025
Great doctor. Makes you feel comfortable.
May 05, 2025
Extremely satisfied with Dr. Gastelum and his staff are ALWAYS Courteous and helpful.
April 29, 2025
He is very thorough in explaining the facts. At every appointment I learn something new.
April 23, 2025
Dr. Gastelum and staff are outstanding!
April 22, 2025
Simply excellent visit. Dr. Gastelum is the best.
April 18, 2025
This was my first time seeing this Doctor. He was knowledgeable, polite and very helpful. I would definitely recommend him to family and friends
April 18, 2025
I love this ENDO doc and would see no other, but they overbook. I was waiting in a room for 1 hour before he came in. Unacceptable... And it takes months to make an appt with him unless the nurse hands you a pre-scheduled appt, when you are done. But better not try to change it because it will be 6 mo before you can get in again.
April 16, 2025
The front office ladies the day of my visit I was not pleased with them
April 15, 2025
For doctors be better doctor than I have to go, I have been with him for several years and I like him a lot, thank you.
April 09, 2025
I've been seeing Dr Gastelum for many years. I've followed him from one place to now PIH. He probably saved my life by finding out my illness and taking care of me. I will probably be seeing him for a long time. I'm so grateful for him.
April 04, 2025
Dr. Gastelum is a great doctor. His office staff always gets my prescriptions right and they email me very quickly and his whole staff is very nice.
April 03, 2025
Dr. Gastelum is friendly, listened to my needs and addressed all of my concerns.
April 03, 2025
Dr. Gastelum was kind, professional, and patiently answered all of my questions. His staff was helpful and assisted me with everything I needed. Both (two names removed), (members of his staff) were wonderful in taking care of me and my concerns. I'm grateful to Dr. Gastelum and his office for all of the care they provide. (PHI removed)
March 20, 2025
He provides excellent care.
March 19, 2025
My only problem has been getting through on the phone. And I know there was system problems before, but even right now, just you're really on hold for half an hour, 40 minutes to make an appointment or ask a question. So that's the only thing that's been my concern. Thank you.
March 13, 2025
Well, I like Dr. Gastelum. I felt relaxed with him and I felt that we kind of understand each other, which is a very good thing. And I feel confident that he'll be able to help me to regulate my thyroid. And I definitely would recommend him to friends, family. And I'm very thankful that he was able to give me an appointment so I had that chance to meet him and fill him out. So I feel very satisfied. Thank you.
March 13, 2025
The front office girl did not bother to check the sign in sheet to check in patients. I had to go up to ask her if she checked me in, she asked if I sign in, but didn't even check me in the order that I arrived. The patient who arrived after me was taken before me, so my 10:40 appointment was delayed even though I arrived 10 minutes before my appointment time as I was asked to do.
March 11, 2025
Office staff very courteous and Dr Gastelum listens to my concerns... Looks through my profile and blood work,medicines throughly...
March 11, 2025
Very professional yet personable. Knows my hx. Good bedside manners
March 10, 2025
Dr. G and staff were all professional, courteous, and attentive.
March 06, 2025
Dr Gastelum is the best i highly recommend him
March 05, 2025
Very pleased with my office visit. The doctor answered all my questions. He went over my blood test results.
February 18, 2025
I would just like to say that Dr. Gastelum is a brilliant man and is very good at what he does and I appreciate him and all of you do very much. Goodbye.
February 13, 2025
I believe that the doctor is a very professional and great doctor. I mean, I had no issues with him whatsoever. I think that he does need maybe a better staff to help him just because they are a little unfriendly. I'm not sure if it was because of the day or whatever, but yes.
February 12, 2025
No improvement needed. Everything went very smoothly. Love Dr. Gastelum and the staff. So happy with this medical office and with Dr. Gastelum.
February 11, 2025
Dr. Gastelum is a most impressive physician. He was prepared for my visit and prescribed an essential monitorng device, lab work and radiology tests. He scheduled a followup for two weeks later. It took months to get this appointment following my referral, but was worth the wait.
February 07, 2025
I really like Dr Gastelum. He listens and is very thorough.
February 06, 2025
Very courteous front staff and as always Dr. Gastelum took his time listening to me and explaining my plan of care.
View More Reviews