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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.

David Diaz, MD

  • Reproductive Endocrinology and Infertility
Additional Language Spoken
Spanish, French, English
Medical Groups & Affiliations
  • St Joseph Heritage Medical Group
  • St. Joseph Hospital Affiliated Physicians
  • St. Jude Affiliated Physicians
  • St. Jude Heritage Medical Group
West Coast Fertility Center
11160 Warner Avenue
Suite 411
Fountain Valley, CA 92708
Accepting New Patients

Primary Office

West Coast Fertility Center
11160 Warner Avenue
Suite 411
Fountain Valley, CA 92708
Get Directions
(714) 513-1399
(714) 513-1393
Mon - Fri: 8 a.m. - 5 p.m.

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Reproductive Endocrinology and Infertility
    Areas of Interest
    Gynecology, Infertility, Reproductive Endocrinology
  • Biography


    David Diaz, MD is the Founder and Medical Director of West Coast Fertility Center, established in 1988. Dr. Diaz completed his medical training at Loyola University School of Medicine and finished his residency in the specialty of Gynecology and Obstetrics at the University of Missouri School of Medicine. West Coast Fertility Centers was established when Dr. Diaz completed his sub-specialty training in reproductive medicine at Harvard Medical School.

    Orange Coast Magazine featured the honorary mention of Dr. Diaz being awarded the 2016 Castle Connolly’s Top Doctor. Physicians gets nominated and selected for this award by other physicians whom they feel represent the most outstanding credentials and experience in their specialty field.

    During his Gynecological training program at the University of Missouri, Dr. Diaz developed an interest the treatment of infertility during his training in endometriosis surgery, uterine reconstruction for fibroids, tubal repair and all aspects of vaginal surgery. He established the first microsurgical laboratory for training resident physicians and medical students in the technique of microsurgical unification for tubal repair. His mentor, Dr. William Griffin, encouraged him to pursue advanced fellowship training.

    Dr. Diaz was awarded a two year Fellowship in Reproductive Endocrinology at Harvard Medical School, Beth Israel Hospital in Boston, Massachusetts. His training was supervised by Dr. Melvin Taymor, whose team of scientists achieved the first IVF pregnancy in New England (1984). Dr. Taymor was responsible for introducing the use of the fertility drug Pergonal to the United States in collaboration with Dr. Bruno Lunenfeld from Israel. Dr. Diaz performed research in the development of medication protocols for IVF that led to one of the highest pregnancy rates in the nation. At Harvard, Dr. Diaz was taught the art and science of in-vitro fertilization at Boston IVF, the largest private IVF clinic in the world, working with renowned experts: Dr. Michael Alper, Dr. Irwin Thompson, Dr. Merle Berger and Dr. Selwyn Oskowitz. The training program at Harvard was complemented by specialty training in the area of reproductive surgery.

    One of the most memorable aspects of Dr. Diaz' training was the intensive exposure to advanced laparoscopic and hysteroscopic surgery under the tutelage of Dr. Robert Hunt, a world authority in fertility enhancement surgery, whose inspiration led to the publication of several chapters in the classic textbook: Atlas of Female Fertility Surgery. Dr. Diaz' enthusiasm in surgery led to a European experience when he was invited to Kiel, West Germany by Professor Kurt Semm, the inventor of many laparoscopic instruments still routinely used today.

    Teaching was an integral part of the Fellowship Program. Dr. Diaz was appointed to the teaching staff at Harvard Medical School as Instructor in Obstetrics and Gynecology with an emphasis in Reproductive Endocrinology and Infertility. Teaching was a passion of Dr. Diaz since he minored in education at Loyola University in Chicago. The Harvard teaching duties included Grand Rounds presentation, informal teaching of medical students and OB/GYN residents plus mentoring visiting students from around the world. Dr. Diaz' love for teaching continues in private practice today providing tutorials for visiting physicians, nurses, industry representatives and, most importantly, educating his patients at West Coast Fertility Centers.