Serving Katy, TX






Serving the Katy, TX area since 1981, Katy Internal Medicine Associates is your premier resource for personalized healthcare utilizing the latest technology. Our team is comprised of 8 experienced physicians you can trust.


KIMA's mission is to provide quality healthcare in a friendly environment. Your health is important to us, and we look forward to caring for you.

Meet the Physicians of KIMA

Dr. Roger Campana

A graduate of Baylor University in Waco, TX, Dr. Campana attended Drexel University in Philadelphia, PA for his graduate studies before earning his medical degree from Texas Tech University in Lubbock, TX.


Dr. Campana completed his Internal Medicine residency at The University of Texas Medical School in Houston, TX. He is American Board of Internal Medicine eligible and is certified in Advanced Cardiac Life Support by The American Heart Association.

Dr. M. John Chung

Joining KIMA in 2007, Dr. Chung is board-certified in Internal Medicine with special interests in cardiovascular disease, diabetes and preventative medicine.


He graduated Magna Cum Laude in 1995 from the University of Oklahoma’s Health Science Center in Oklahoma City, OK with a Major in Microbiology and a Minor in Biochemistry.


Dr. Chung also completed 3 years of post-graduate training at Loyola University Medical Center in Chicago, IL and is the former Chief of Staff at Memorial Hermann Rehabilitation Hospital in Katy, TX.

Dr. Vish Kalapatapu

Board-certified in Internal Medicine, Dr. Kalapatapu is a graduate of Rensselaer Polytechnic Institute in Troy, NY. He earned his B.S. in Chemical Engineering before enrolling in the AUC School of Medicine. He then completed his Internal Medicine residency in Chicago, IL before finishing his medical residency in Savannah, GA.


Dr. Kalapatapu is the Medical Director of the West Harris County Emergency Medical Services Department, Chief of Staff at Memorial Hermann Rehabilitation Hospital in Katy, and serves on the Peer Review and Medical Executive Committee at Memorial Hermann, also in Katy, TX.

Dr. Mukesh Mehta

Dr. Mehta earned his degree from MP Shah Medical College (a college associated with Saurashtra University in Jamnagar, India) in 1986. He worked at St. John Episcopal Hospital affiliated with State University of New York Woodhull Hospital in Brooklyn, NY, and with Mount Sinai School of Medicine at North General Hospital in NY.


Board-certified in Internal Medicine with special interests in diabetes, geriatrics and preventative medicine, Dr. Mehta scored in the top two percent. He also worked as a research assistant at M.D. Anderson Cancer Center in Houston as part of his post-graduate experience.

Dr. David Reininger

An Honors graduate of the University of Texas Medical Branch in Galveston, TX, Dr. Reininger has been practicing in the Katy, TX area since 1981. He also earned a degree in Business Administration from the University of Houston, where he graduated Summa Cum Laude.


Dr. Reininger has been board-certified in Geriatrics and Internal Medicine since 1987. The former Chief of Staff at Memorial Hermann Katy Hospital, Dr. Reininger has earned the AMA Distinguished Physician Award every year since 2003. Currently, he serves as the Medical Director for the West I-10 Fire Department & EMS.

Dr. Ramon Solis, Jr.

Dr. Solis, Jr. received his Biology degree from Lamar University in Beaumont, TX before completing his medical education at the University of Texas Medical School in Houston. His internship and residency were in Internal Medicine and Pediatrics.


Board-certified since 1992, Dr. Solis, Jr. received the AMA Physicians Recognition Award, 2002 – 2005 as well as several honors in Pulmonary Medicine, Neurology, Nephrology and Critical Care. He served as Chief of Staff at Memorial Hermann Katy Hospital and is a President of the Katy American Heart Association.

Dr. Venessa Tan

Dr. Tan is a graduate of the Sophie Davis School of Biomedical Education at City University of New York Medical School – a selective 7-year combined undergraduate and medical school program.


Dr. Tan graduated Magna Cum Laude with a Bachelor of Science in Biomedical Science and a minor in Asian American studies; completed her medical school training at SUNY Stony Brook School of Medicine.


Dr. Tan obtained her Master's degree in Public Health with a concentration in Health Policy at the Harvard School of Public Health. She then completed her residency program in Internal Medicine at Hofstra North Shore-LIJ Health System. In addition, she was chosen as Chief Resident over the Internal Medicine Program. In this role, she embraced the opportunity to mentor students and trainees.


While on faculty at New York Presbyterian Queens, she served as a Hospitalist Attending Physician. Dr. Tan is licensed in Internal Medicine with interest in diabetes, cardiovascular health, preventive medicine, and critical care medicine.  


Dr. Tan is a member of the American College of Physicians, Harris County Medical Society and Texas Medical Association.  


Dr. Tan moved to the Katy area with her husband and two children. She has interests in community service and health policy, and enjoys fine dining, travel, sports and spending time with family.

Ensure caring and compassionate care!


Learn More About the KIMA Team of Physicians Today

Jerica Arunthamakun

DR. Nynke Den Hollander

Our PA that specializes in Diabetes.  

Jerica Arunhtamakun Dr. den Hollander

Dr. den Hollander grew up in the Netherlands. During her medical training, she did a research project in the United States and met her husband. After completing her medical training Cum Laude, she moved to South Carolina and started a residency in Internal Medicine and Pediatrics. With her husband working in the oil industry, their path soon led to Houston where she finished her residencies in Internal Medicine at UTMB in Galveston. Dr. den Hollander is Board Certified in Internal Medicine since 2012. She works as a hospitalist at Memorial Hermann Katy and can occasionally be found in the clinic setting as well.


Dr. den Hollander has four young children. She enjoys spending time with her family, gardening and playing the violin.

Dr Vanessa Tan Dr Ramon Solis Jr Dr David Reininger Dr Mukesh Mehta Dr Vish Kalapatapu Roger Campana Dr M John Chung Michelle (Dr Kalapatapus Nurse)

Michelle (Dr. Kalapatapus Nurse)

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Dr. Chung and Amanda


Dr. Mehta and Vanessa