Valley Urology is focused on developing trust, providing patient education, and delivering progressive treatments with surgical excellence in a wide range of urologic conditions.

Valley Urology was founded in June 2006, by Dr. Greg Rainwater, the most sought after urological surgeon in Central California with over 30 years of experience.

Urology is the medical and surgical specialty that manages diseases and dysfunction of the male and female urinary tract and the male reproductive system. These problems include urological cancers (prostate, bladder, kidney, ureter, and testicle), kidney stones and cysts, prostate related voiding complaints, erectile dysfunction, urinary tract infections, incontinence, infertility and erectile dysfunction. Please refer to the ‘Services’ link on the left side bar for a full range of office and operative based procedures.

We accept most insurance policies and will gladly answer any questions you may have regarding insurance coverage.


Dr. Rainwater is proud to have been born and raised in the Central Valley of California. He completed his medical school and urological training at the University of Southern California (USC) in 1984 under the guidance of the esteemed oncologic surgeon, Dr. Donald Skinner. He is Board Certified in Urology and has been providing comprehensive care to patients for over 35 years.

Over the course of Dr. Rainwater’s career, he has been willing to take on new challenges for his patient’s. Often being the first to try new techniques and devices, for example, Dr. Rainwater was the first in the area to work with the DaVinci Robot, the Sling, Urolift and Rezum. Doing this over his many years, has allowed Dr. Rainwater to tailor his care for each of his patients’ specific needs, which typically allows his patients to have the best results. 



Carleton College, Northfield, MN
B.S. | 1971-1975
University of Southern California, Los Angeles, CA
Doctor of Medicine | 1975-1980


LAC/USC Medical Center, Los Angeles, CA
General Surgery | 1979-1980


USC Medical Center, Los Angeles, CA
Urology | 1980-1984


California State Medical License | 1985
American Board of Urology | 1986
National Board of Medical Examiners | 1980


American Medical Association
California Medical Association
Fresno-Madera Medical Society
American Urology Association
Western Section American Urology Association
Infertility Society


Fresno Urological Group
7/84 – 1/97
Urology Associates of Central California
1/97 – 1/06
Valley Urology of Central California
1/06 – Present


Dr. Matthew Rainwater has recently decided to join his father and become part of the Valley Urology team. He is excited to be returning to the Central Valley after spending 15 years in the midwest. During that time, Dr. Rainwater spent most of his time in Omaha, NE where he completed medical school and a couple other masters degrees. After starting his training in surgery, Dr. Rainwater decided he wanted to be more involved in patients everyday health. With that in mind, he moved back to the Central Valley to move forward as a general practitioner.

As Dr. Matthew Rainwater grew up surrounded by the world of urology, he does have a special interest in Men’s Health and Clinic Urology, which makes him a great new addition at Valley Urology. Additionally, being a General Practitioner allows Dr. M. Rainwater to broaden his practice to be able to see patients that may also need someone on their team that can help them live a healthier life. Which is why Dr. M. Rainwater is excited to start this next step in his career. In his free time, Dr. Matthew Rainwater likes to stay busy whether by getting into home remodeling projects or getting some golf rounds in on his days off.



Creighton University, Omaha, NE
B.S. (Bachelors of Science)
Creighton University, Omaha, NE
M.S. (Masters of Science, Clinical Anatomy)
Creighton University, Omaha, NE
M.D. (Doctor of Medicine)
Creighton University, Omaha, NE
M.B.A (Masters of Business Administration)


Beaumont Hospital, Royal Oak, MI


Chao Vang R.N., M.S.N., F.N.P. is one of our most experienced nurse practitioners specializing in Urology.

She specializes in kidney stone disease and has a strong commitment to the treatment, follow-up, and emphasis of patient education for the prevention of kidney stones.

Chao began her collegian education at California State University, Fresno where she earned her Bachelor of Science as a Registered Nurse. After completing her undergraduate degree she started her nursing career in 1996 where she worked as a Registered Nurse (RN) at Community Medical Center, Fresno for eight years, while simultaneously earning her Masters Degree in Nursing (MSN) with an emphasis in Family Nurse Practitioner (FNP) at California State University, Fresno.

Chao is happily married and has three children. In her spare time she loves to spend time with her family and plays tennis.