about us

American Diabetes Association and National Committee for Quality Assurance on the achievement of recognition for delivery of quality diabetes care (2010-2013)

Our Philosophy

On behalf of Pedro J. Penalo, MD, PA, we welcome you to our medical practice. At Weslaco Medical Clinic and Mercedes Medical Clinic we strive for excellence in everything we do. Quality and compassionate patient care is our number one priority. Over the last 8 years, we have served the Rio Grande Valley with an impeccable degree of professionalism, the highest and most excellent standard of care, and a compassionate commitment to our patients. Our patients enjoy treatment by outstanding providers and medical staff. Our clinics run on a service-oriented philosophy and provide patients with the best access to improving their well-being. Our internal medicine physicians and providers specialize in the care of patients 18 years of age and older. Our practice provides a range of diagnostic procedures right in our offices and we also have admitting privileges to Doctors Hospital at Renaissance and Knapp Medical Center. Our patients benefit from personalized care while hospitalized, as we believe in providing the best, personalized medical attention at all times. Our welcoming staff is dedicated to provide all patients with the best experience.

Physicians & Providers

Our friendly, knowledgeable, and experienced staff members are eager to serve you.

Pedro J. Penalo, MD
Board Certified Internal medicine & Chief Medical Director and Provider
Nelda D. Cortez
Practice Administrator

Claudia C. Pierson, M.D
Medical Provider

Maria Gonzalez, BSN, MSN, RN, FNP
Medical Provider

Joyful, happy, and patient focused, matched with excellent training and valuable experience, describes Maria's approach to her work as provider in our practice.