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About St. Joseph Health

SJH provides a full range of care facilities including 16 acute care hospitals, home health agencies, hospice care, outpatient services, skilled nursing facilities, community clinics and physician groups. All of our hospital and home health entities are accredited by the Joint Commission. In our award-winning facilities, SJH maintains a "continuum of care," matched to the diverse needs of the urban centers, smaller cities and rural communities who depend on us every day.

Ziad El-Hajjaoui, MD

4.6 out of 5 (100 Ratings)
  • Internal Medicine
    (Board Certified)
Additional Language Spoken
Arabic, English
Medical Groups & Affiliations
  • St. Mary High Desert Medical Group
  • St. Mary Medical Center
St. Mary High Desert Medical Group
17095 Main St.
Hesperia, CA 92345
Accepting New Patients

Primary Office

St. Mary High Desert Medical Group
17095 Main St.
Hesperia, CA 92345
Get Directions
(760) 241-6666
(760) 947-5619
Mon - Fri 8 a.m. to 5 p.m.
Weekend Hours

More Information


  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Internal Medicine
      (Board Certified)
    Areas of Interest

    Internal Medicine

  • Biography



    Dr. Ziad El-Hajjaoui attended medical School in Syria. He later served as postdoctoral scholar at the University of California, Los Angeles. Prior to joining St. Mary High Desert Medical Group, Dr. El-Hajjaoui was on staff at McKeesport Hospital in Pennsylvania and LAC-USC Medical Center in Los Angeles. Dr. El-Hajjaoui has a special interest in cardiology and enjoys spending time with his family in his spare time.

    Board Certified
    Internal Medicine
    American Board of Internal Medicine
  • 4-Sep-2018
    All experiences have been VERY GOOD.
    very pleased with Doctor and staff
    Dr. El made a point he wanted to make by using valuable appointment time to contradict himself. I was very concerned about being misdiagnosed in the hospital and that proper imaging for the problem I had was not done. I had a lot of tests done in the hospital but not the most vital. I had even seen who I thought was a doctor the day before going into the emergency room and she didn't take me seriously or help. Dr. El explained that I should just relax. He said Doctors don't know everything and that there are average ranges for test scores and that those averages don't apply to all people but my scores were only a little bit off from average so I shouldn't worry. However, he didn't have the time to listen to all my symptoms. And, by the logic of not everyone fitting the averages, my baseline might not fall within the averages to begin with, and my being a little off to average could be a lot off to my baseline. He used valuable time reassuring me that I was fine when I know I'm not fine. Now, I've seen four providers that didn't order necessary testing or take me seriously. The 15-minute appointments combined with not being taken seriously are not doing much to help prevent another emergency visit or stop the functioning decline I am feeling. What harm would a CT without contrast done or an ultrasound have done? Do no harm -- do you know how many tests I went through unrelated to my liver/kidney/pancreas function when I've told every doctor that my metabolic specialist had been saying for years that she thought my pancreas was being attacked by autoimmune more so than true diabetes causing my symptoms. Doctor Khoa in the hospital told my that my test results were mostly normal, that he didn't think I had pancreatitis or ullcerative collitis (which can be related to BLA-27), and that I had IBS. That doctor diagnosed me with something that can come after pancreatitis... and didn't order one imaging test of the pancreas. The day before that emergency room visit, the PA didn't order any testing, she noted that we talked about nutrition and exercise. One good thing Dr. El did was that when I requested digestive enzymes, he did order enzymes. I don't think it is all the enzymes I was requesting (Protease, Dnase, and lipase) but it should at least include some of what I need. I'm having a problem with collagen also, as for at least four years, I've had plantar fasciitis and spurs developing in both feet. This is more common in people with autoimmune because of higher levels of homocysteine and lack of digestive enzymes. Once again, it says in my notes that we talked about nutrition and exercise. Not only am I not getting properly diagnosed for the internal organ problem, I'm also started to get blamed for the problem. I've complained for years that my body isn't functioning properly and that weight has been coming back on when it should be coming off. Now that 40 lbs came back on, and my cholesterol was high for the first time ever despite eating healthy food (which is a symptom of dysfunction), I'm just being "counseled" on eating healthy and chances to get to the bottom of the liver/kindey/pancreas problem with imaging or testing are being overlooked as well as any chance to treat an infection. There have been some signs of infection but no one has tried to properly diagnose or treat that infection. I didn't realize he had changed the dose of a medication and he sent the medication to a local pharmacy instead of express-scripts which would have been better for me. When I got home, I saw a decline of service notice saying he or his office told them I was not diabetic. Not only have I been diabetic for years and that information is in the St. Mary's system, but no one at the office mentioned this to me during my visit. I saw this notice in the mail when I got home from the appointment. Having St. Mary's/ HMO has been disastrous for my health. All the waiting, different people saying different things and getting penalized for following the wrong advice of what one person tells me, trying to do what I'm told with the time I have has not gotten me very far. There have been missed opportunities to treat and diagnose the underlying causes. I think Dr. El is a good doctor working under ridiculous time constraints. 15 minutes for a patient that was seen by a PA a day before going into the emergency room and was admitted. Some time being used up for a reassuring lecture that was self-contradicting. The promise of seeing a doctor who could give more time only to be told off by that Doctor's staff that I went about trying to see her the wrong way - I was doing what I was told was OK to do. I have less and less hope of getting proper care at St. Mary's with each doctor that misses an opportunity to help or tells me something that someone else says isn't true. If Doctor Khoa had just given me the results in the hospital instead of making me get them through medical records, I would have known not accept the discharge without additional testing and to accept the visit with Dr. Miranda, but he had refused to give results and had me believing they were mostly normal when I still felt so sick. What one doctor is able to accomplish is very much affected by the other staff and doctors interacting with the patient. St. Mary's should consider additional continuing education for each doctor, giving hospital patients immediate copies of available results to have a full understanding of what is happening, and better training and communication for the continuation of care options and protocols that patients have and must follow. The wait times to see one doctor regularly can be difficult and problematic, and if there is an overall shortage of doctors, having better training and communication could start to mitigate some of the problems patients have as a result of long wait times to see their primary when their emergency is now.
    I think that the dr. should spend more time with you until all of your questions/concerns/problems are talked about instead of being on a time limit.
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