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“I enjoy treating the entire family and believe in treating the patient as a unit in the physical, emotional, spiritual and social context.” Dr. Mario Oliver is board certified in Family Medicine and has special interest in Endoscopy, Emergency Medicine/Urgent Care and Procedures. He received his medical degree from the University of Xochicalco, College of Medicine in Ensenada, Mexico in 2006. After completing his medical degree he provided medical consultation, emergency services and surgical assistance for several large area hotels and resorts. He went on to become the Asthma Coordinator of the South Bay Asthma Advocacy Program and to provide outpatient and urgent care services at C.H.I.P.S.A. Hospital and Tijuana General Hospital in Tijuana, Mexico. Dr. Oliver served his residency at the Sparks Regional Medical Center of the University of Arkansas for Medical Sciences (UAMS). Dr. Oliver’s professional certifications include: American Medical Association American Academy of Family Practice International Educational Research Foundation, US Medical Degree Certification Educational Commission for Foreign Medical Graduates American Heart Association, Advanced Cardiac Life Support American Heart Association, Pediatric Advanced Life Support American Heart Association, Neonatal Resuscitation Program Provider Advance Life Support Obstetrics American College of Surgeons, Advanced Trauma Life Support Dr. Oliver joined Graybill Medical Group’s Temecula Office in 2014. He speaks fluent Spanish.
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Takes time to answer my questions
Provides follow-up as needed

Based on patient feedback. Read the reviews


Dr. Oliver's Rating
11 Ratings
Patient Perspective
3.0 Explains conditions and treatments
4.0 Takes time to answer my questions
4.0 Provides follow-up as needed
Office Rating
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25485 Medical Center Dr Ste 100, Murrieta, CA, 92562
n/a Average office wait time
n/a Office cleanliness
n/a Courteous staff
n/a Scheduling flexibility
Graybill Medical Group
25485 Medical Center Dr Ste 100
Murrieta, CA, 92562
"Dr Mario Oliver of Graybill Medical is a terrible Dr who absolutely DOES NOT CARE about you as a human being at all!!! BEWARE & RUN AWAY go elsewhere if you want a real Dr to give you actual CARE!! He is a dr for the money only! Greed is why he goes to work each day. He wants to make the most money off of you in reach visit but he DOES NOT care at all about you or your illnesses or injuries!! He gives horrble care, he treats you like a new patient each time with no acknowledgement of past visits or that he even has a clue what is going on with you even with your medical history in from off him. He should not be practicing medicine on anyone. "
  • January 20, 2022
"My regular primary care physician, Dr. Matta, was out of town, so I saw Dr. Oliver instead via telemedicine. At the beginning of my appointment, he greeted me with the previous patient's name - this was not a big deal, but did not feel great! When Dr. Oliver asked why I had come in for an appointment, he didn't let me finish my explanation (I had a flare up of rashes) - he told me that he couldn't take my concerns at face value and could not see my skin clearly enough through the video camera on my computer, and nearly refused to help me. I asked for routine blood work since it had been several years since last had blood work, just to make sure that my flare up wasn't related to that. He initially said he could not just do lab work for no reason; however, after a long discussion, he later changed his mind and allowed me to get blood work. I also mentioned that my dermatologist had given me a steroid cream for the rash and it wasn't helping. Dr. Oliver kept referring to my rash as "acne", ...
and saying that my dermatologist doesn't know what she's doing by giving me a steroid cream for "acne". I had to explain multiple times that it's not acne - it's a rash. I don't normally write reviews, but I did not feel great walking away from this appointment. I didn't feel like Dr. Oliver listened to me or took me seriously. Additionally, I felt like he was condescending toward me and my dermatologist. I know this is a difficult time for everyone, but there is no excuse for that kind of patient treatment. I wish him well, but I hope Greybill sees this and talks to him about it! Positive note: Dr. Oliver's nurse was very kind and did an amazing job getting me set up for my telemedicine appointment! "
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  • September 28, 2020


25485 Medical Center Dr Ste 100
Murrieta, CA, 92562
Mon7:30 am - 5:00 pm
Tue7:30 am - 5:00 pm
Wed7:30 am - 5:00 pm
Thu7:30 am - 5:00 pm
Fri7:30 am - 5:00 pm
31537 Rancho Pueblo Rd Ste 102
Temecula, CA, 92592
  • Accepting New Patients
  • Medicaid Accepted
Mon8:00 am - 7:00 pm
Tue8:00 am - 7:00 pm
Wed8:00 am - 7:00 pm
Thu8:00 am - 7:00 pm
Fri8:00 am - 5:00 pm
  • Accepting New Patients
  • Medicaid Accepted
225 E 2nd Ave Ste 210
Escondido, CA, 92025
225 E 2nd Ave
Escondido, CA, 92025
  • Accepting New Patients
  • Medicare Accepted
  • Medicaid Accepted
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
  • Accepting New Patients
  • Medicare Accepted
  • Medicaid Accepted
2185 Citracado Pkwy
Escondido, CA, 92029




Medical School
Centro De Estudios Universitarios Xochicalco Escuela De Medicina Ensenada
Graduated 2003
Sparks Regional Medical Center


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