About Us

Our Philosophy

The Institute’s purpose is to provide excellence in patient hernia repair at a minimal expense to the insurance carrier and the patient. This philosophy evolved through 28 years of experience and success utilizing specialized polypropylene mesh. Our friendly rapport with our patients and with insurance companies has allowed us to grow to become a center of excellence in hernia repair.

From one center, we have expanded to multiple locations throughout California. We have enlarged our staff by selecting Board Certified Surgeons with interest in the advance of hernia repair techniques. Working with local outpatient centers and hospitals, these surgeons were trained, observed by N.A.H.I. staff, and then qualified to join the Institute. Our present hernia repair has evolved over many years into a straight forward outpatient mesh reinforced herniorrhaphy.

Our Providers- Meet the team

Michael Chin, MD, FACS, RPVI


Dr. Michael Chin is a board-certified surgeon who specializes in treating a wide range of vascular and general disorders.

Dr. Chin  has been a practicing surgeon for more than 20 years.  He is a member of the American College of Surgeons (ACS), the International College of Surgeons, the American Hernia Society (AHS), the Vascular Access Society of America (VASA), the California Medical Association (CMA), the American Society of Breast Surgeons (ASBS) and the Riverside County Medical Society (RCMA).

Clarence Petrie, MD, FACS


 Dr. Petrie has been a surgeon on staff at St. Jude Medical Center since 1978. Dr. Petrie received his medical degree from the University of Cape Town where he also did his internship. He held residencies at Edendale and Groote Schuur Hospitals in South Africa and also at the Mayo Clinic where he did residencies in General Surgery, Transplant Surgery and was a Special Clinical Fellow. He joined the staff in 1972 and practiced surgery, taught in the Mayo Medical School and the Surgical Residents Program. He was promoted to Assistant Professor of Surgery in 1974. He is Board Certified and a Fellow of the American College of Surgeons and a Fellow of the Royal College of Surgeons of Edinburgh. 

Eric Pham, MD



Dr. Eric Pham received his Bachelor of Science degree in Biological Sciences from the University of California, Irvine, and graduated Magna Cum Laude. He then went on to receive his Doctorate of Medicine degree from the University of California, San Diego, followed by a General Surgery residency at Loma Linda University Medical Center in Loma Linda, California. After his residency he completed a rewarding year of fellowship in Minimally Invasive Surgery at the University of Southern California in Los Angeles.

Dr. Pham is board certified in General Surgery and maintains a special interest in advanced laparoscopic procedures, including gastric bypass, gastric banding, sleeve gastrectomy and revision weight loss surgeries, hernia repair, splenectomies and adrenalectomies. He actively participates in the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) at St. Joseph Hospital which is honored to hold the designation as Comprehensive Center for bariatric and metabolic surgery.