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Compassionate care for your kidney health.

Experience the difference expert Nephrologists care can make. We’re committed to managing your kidney health.

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Interventional Nephrology Associates

Renal Access Clinic of Houston

Southeast Texas Renal Access Center

Heights Surgery Center

Expert Kidney Care You Can Trust

At Interventional Nephrology Associates, your kidney health is our top priority. Our Board-Certified Nephrologists provide expert care for all aspects of kidney disease, trusted by Primary Care Physicians to deliver the highest level of treatment. We’re dedicated to supporting you with compassionate, specialized care.

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Expert team

Our highly skilled professionals are dedicated to your care.

Advanced technology

We utilize the latest techniques and equipment.

Patient-centered care

Your comfort and well-being are our top priorities.

Convenient location

Easily accessible for your appointments.

Our Areas of Expertise

We provide specialized kidney care tailored to your needs. Our skilled team offers advanced treatments and personalized solutions for optimal renal health.

  • Acute Kidney Failure
  • Chronic Kidney Disease
  • End Stage Renal Disease
  • Hypertension
  • Blood Pressure Management 
  • Acid-based Diseases
  • Glomerular Diseases
  • Kidney Transplantation 
  • Acute and Chronic
  • Hemodialysis 
  • Peritoneal Dialysis 
  • Kidney Stones 
  • Swelling and Fluid Retention

Meet our providers

Dr. Pedro Frommer​

FACP, FRCP (C)
Medical Director, Interventional Nephrology

Dr. Sumia Rashid

Nephrologist

Saturday Ugbo

DNP, FNP-BC
Nurse Practitioner

Our patients love us
“I love it here! The doctors and nurses are so very nice and kind to you. I went in there scared, but they assured me everything would be okay and calmed me down. The staff is amazing. Thank you all for your hard work and tender hands and hearts.”
- Jane
"Very satisfied with the doctors and their staff. The doctors take their time and make sure to answer my questions. The office staff is very welcoming and the location is convenient and easy to find. I HIGHLY RECOMMEND!"
- Pauline
"The best place to get your dialysis life line fixed. Good work ethics."
- Benedicta

Please call our office to schedule an appointment with our Kidney Specialist

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©Renal Access Clinic of Houston, All rights reserved

Dr. Pedro Frommer

FACP, FRCP (C) Medical Director, Interventional Nephrology

Dr. Pedro Frommer, FACP, FRCP (C) is the Medical Director of the Renal Access Clinic. He is a Clinical Professor of Medicine at Baylor College of Medicine and the University of Texas Medical School in Houston. Dr. Frommer is one of the most experienced
 Interventional Nephrologists in the U.S. with more than 30 years of combined experience in Nephrology and in Interventional Nephrology. He is Board Certified in Internal Medicine, Nephrology, and ASDIN Certified in Interventional Nephrology. Dr. Frommer is
 experienced in Acute Renal Failure, Chronic Kidney Disease, Acid-Base Imbalances, Hypertension, Kidney Transplantation, Acute and Chronic Hemodialysis and Peritoneal Dialysis.   

Dr. Sumia Rashid

Nephrologist

Dr. Sumia Rashid (include headshot) is Board Certified in Internal Medicine, Nephrology and is ASDIN Certified in Interventional Nephrology. She received her medical degree from Medical College of Kashmir in Kashmir, India. Dr. Rashid completed her internship, residency, and fellowship in Nephrology training at the University of Toledo Medical Center in Toledo, Ohio. She is a member of both the American Society of Nephrology and the National Kidney Foundation. Dr. Rashid is a highly qualified Interventional Nephrologist and is experienced in the treatment of Acute Renal Failure, Chronic Kidney Disease, Hypertension, Acid-Base Imbalances, Kidney Transplantation, Acute and Chronic Hemodialysis and Peritoneal Dialysis. 

Saturday Ugbo

DNP, FNP-BC Nurse Practitioner

Saturday is a Nurse Practitioner to Interventional Nephrology Associates. He earned his Doctor of Nursing Practices in Family Nurse Practitioner and Emergency care from Rutgers University in Newark. Saturday is Board Certified by the ANCC and a member of the American Society of Nephrology.  Before becoming a Nurse Practitioner, Saturday was a Registered Nurse in Adult and Pediatric ICUs for over eight years. He has extensive experience providing care to many patients in diverse communities. As a Nurse Practitioner, he works closely with Dr. Frommer and Dr. Rashid to assist in the evaluation and treatment of Acute Renal Failure, Chronic Kidney Disease, Dialysis, Hypertension, Peripheral Vascular Disease and Peripheral Arterial Diseases. Saturday is committed to providing the highest quality, compassionate and evidence-based care to all our patients to improve patient outcomes. In his free time, he enjoys spending time with his family, traveling and playing sports.

Contact Us

Have questions or need assistance? Reach out. We’re here to help!

Dr. Christos Katsigiannis

MD, FACS, FCCP Vascular Surgeon

Dr. Katsigiannis is Board Certified in Thoracic, Cardiac and General Surgery. He completed his medical education from Texas Tech University Health Sciences Center School of Medicine and his Residency and Fellowship was completed at Baylor College of Medicine. He has over 30 years of combined experience with 23 years of cardiovascular surgery. As a Vascular Surgeon, he specializes in creating Arteriovenous (AV) Fistula and Graft, Peritoneal Dialysis (PD) Catheter Insertion, Peripheral Arterial Disease evaluation and intervention, and any renal access interventional procedures. Dr. Katsigiannis is compassionate and committed to providing the highest quality of care to his patients. In his free time, he enjoys spending time with his daughters, friends, reading and listening to all kinds of music.