Dennison Renal Care


Experienced Care. Experienced Doctors.


About Our Practice

Dennison Renal Care is a nephrology practice providing comprehensive state of the art diagnosis and treatment for kidney related diseases. We also provide services for hemodialysis, peritoneal dialysis, renal transplantation referral, and followup.

What is Nephrology?

Nephrology concerns the diagnosis and treatment of kidney diseases, including electrolyte disturbances and hypertension, and the care of those requiring renal replacement therapy, including dialysis and renal transplant patients. Many diseases affecting the kidney are systemic disorders not limited to the organ itself, and may require special treatment. Examples include acquired conditions such as systemic vasculitides (e.g. ANCA vasculitis) and autoimmune diseases (e.g., lupus), as well as congenital or genetic conditions such as polycystic kidney disease.

What is a Nephrologist?

Nephrologists are general medicine specialists in kidney diseases. They train as general internal medicine physicians then specialize with additional training in diseases of the kidneys and hypertension. This additional experience is important not only in treating kidney disease but in knowing the effect of drugs, diet, and hypertension on kidney disease. The primary role of the nephrologists is the appropriate diagnosis of kidney disease, to educate patients on how to slow any disease progression, and together with the patient provide a continuum of care.

Our Team



Henry Wehrum

“It’s been my pleasure to partner with patients in Central Ohio for over 20 years, to assist them in achieving their healthcare wellbeing. “

Dr. Henry Wehrum is well known for the expert care he provides to each Dennison patient. He has been serving patients involved with nephrology since 1993. His dedication to quality medical care has allowed Dennison to grow, and he is excited to have Dr. Shim and Randi Bates (FNP-C) join him in continuing to provide Dennison patients with the quality care they deserve. Dr. Wehrum serves as medical director of Liberty Dialysis West. In his free time, he enjoys small boat sailing, photography, and spending time with his wife watching their kids play sports and develop their musical talents.



Wittenberg University

Ohio University
D.O., 1985

Cleveland Clinic Foundation
Nephrology Fellowship




Rosemarie Shim

“My goal is to provide a quick, thorough appointment and expert patient care. I believe education is really important for best patient outcomes. I want to make sure each person understands the cause of their kidney disease, what they can do to delay progression, and how to improve health.”

Dr. Shim brings 10 years of Nephrology experience with a caring approach to patient care. She graduated from the Ohio State University College of Medicine in 2001. After completing her Nephrology fellowship at the University of Michigan, she taught at the OSU College of Medicine for seven years before joining Denison Renal Care. She enjoys gardening and playing with her two children.


The Ohio State University
College of Medicine, 2001

University of Michigan
Nephrology Fellowship



Nurse Practitioner

Randi Bates

“As a nurse practitioner, I recognize that team-based, expert, and personalized care is key in helping you obtain optimal kidney/hypertension health. As such, I partner with you, your other health care providers, and collaborate with Dr. Wehrum to provide you this holistic, expert care.” 

Ms. Randi Bates joined Dennison Renal Care in 2015 after graduating from The Ohio State University College of Nursing Family Nurse Practitioner program. Before that, Randi obtained a Bachelor of Science in Nursing from The Ohio State University College of Nursing and became a Registered Nurse (RN) in 2008. With her nursing background, Randi has also served in the Peace Corps (Dominican Republic, 2008-2010) and was an RN for OSU Hospital and free clinics in Columbus. In her spare time, Randi is working towards her PhD in nursing, where she studies how early life stress affects our life-long health, including our kidney/hypertension health. Randi has been recognized for her efforts as she was honored to be an American Society of Nephrology Kidney STAR (2015, 2016) and a Jonas Nurse Leader Scholar (2016-2018).

Randi speaks English and Spanish. 


The Ohio State University
College of Nursing, 2008