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Southern Texas Nephrology
Southern Texas Nephrology
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Dr. Ricardo Baltodano

Dr. Ricardo Baltodano received his medical degree from Universidad Autonoma de Nicaragua and has been in practice for more than 20 years.

Hospitals:

Valley Regional Medical Center -  Brownsville, TX 

Solara Specialty Hospital -  McAllen, TX 

Doctors Hospital at Renaissance (DHR Health) -  Edinburg, TX 

Education:

Medical School & Residency

University of Texas Medical Branch Hospitals

Fellowship, Nephrology, 2011-2013

Texas Tech University HSC El Paso

Chief Residency, Internal Medicine, 2010-2011

Texas Tech University HSC El Paso

Residency, Internal Medicine, 2008-2011

Universidad Autónoma de Nicaragua Faculty of Medicine

Medical School, 1994-1999

Certifications & Licensures:

American Board of Internal Medicine Certified in Nephrology

American Board of Internal Medicine Certified in Internal Medicine

Texas State Medical License - Active through 2024

Dr. Reuben Valentin

Dr. Reuben Valentin received his medical degree from Universidad de Guadalajara and has been practicing medicine for over 13 years.

Hospitals:

Valley Regional Medical Center -  Brownsville, TX 

Solara Specialty Hospital -  McAllen, TX 

Doctors Hospital at Renaissance (DHR Health) -  Edinburg, TX 

Education:

Medical School & Residency

University of Texas Health Science Center San Antonio

Fellowship, Nephrology, 2009-2011

University of Texas Health Science Center San Antonio

Residency, Internal Medicine, 2006-2009

Universidad de Guadalajara, Medical School

Certifications and Licensures:

American Board of Internal Medicine - Certified in Nephrology

American Board of Internal Medicine - Certified in Internal Medicine

Texas State Medical License - Active through 2023

Dr. John Manllo Dieck

Dr John Manllo received his medical degree from Instituto Tecnologico y de Estudios Superiores de Monterey, Nuevo Leon and has been in  practice for more than 8 years.

Specialty:

Nephrology

Nephrologists specialize in the care of your kidneys; they treat hypertension, hyperkalemia, chronic kidney disease, hemodialysis, kidney transplantation and other kidney related illnesses. Your primary care doctor must refer you to a nephrologist.

Hospitals:

Valley Regional Medical Center

Solara Specialty Hospital

Doctors Hospital at Renaissance (DHR) (Brownsville)

Education:

Medical School & Residency Johns Hopkins University

Fellowship, Transplant Nephrology, 2016-2017

Fellowship, Nephrology, 2014-2016

Henry Ford Hospital Residency, Internal Medicine, 2011-2014

Monterrey Institute of Technology, Medical School

Certifications Licensures:

American Board of Internal Medicine Certified in Nephrology

American Board of Internal Medicine Certified in Internal Medicine

Texas State Medical License Active

Dr. Roberto Manllo Karim

Dr. Roberto Manllo received his medical degree from Instituto Tecnologico y de Estudios Superiores de Monterrey in Monterrey, Nuevo Leon and has been in practice for more than 37 years.

Specialty:

Nephrology

Nephrologists specialize in the care of your kidneys; they treat hypertension, hyperkalemia, chronic kidney disease, hemodialysis, kidney transplantation and other kidney related illnesses. Your primary care doctor must refer you to a nephrologist.

Location & Contact:

Southern Texas Nephrology

1080 E. Los Ébanos Blvd, Suite A

Brownsville, Tx 78520

Office Phone: (956) 542-3472

Office Fax: (956) 546-3112

Hospitals:

Valley Regional Medical Center

Solara Specialty Hospital

Doctors Hospital at Renaissance (DHR) (Brownsville)

Education:

Medical School & Residency

University of Kansas School of Medicine 

Fellowship, Nephrology, 1993-1994

Baylor College of Medicine

Residency, Internal Medicine, 1989-1992

Tecnologico de Monterrey Escuela de Medicina, Medical School, 1985

Certifications and Licensures:

American Board of Internal Medicine - Certified in Nephrology

American Board of Internal Medicine - Certified in Internal Medicine

Texas State Medical License - Active

Dr. Sergio Trevino Manllo

Dr. Sergio Trevino received his medical degree from Instituto Tecnologico y de Estudios Superiores de Monterrey, Nuevo Leon and has been in practice for 9 years.

Specialty:

Nephrology

Nephrologists specialize in the care of your kidneys; they treat hypertension, hyperkalemia, chronic kidney disease, hemodialysis, kidney transplantation and other kidney related illnesses. Your primary

care doctor must refer you to a nephrologist.

Location & Contact:

Southern Texas Nephrology

1080 E. Los Ebanos Blvd, Suite A

Brownsville, Tx 78520

Office Phone: (956) 542-3472

Office Fax: (956) 546-3112

Hospitals:

Valley Regional Medical Center Solara Specialty Hospital

Doctors Hospital at Renaissance (DHR) (Brownsville)

Education:

Medical School Residency Johns Hopkins University 

Fellowship, Nephrology, 2015-2017

Henry Ford Hospital Residency, Internal Medicine, 2012-2015

Escuela de Medicina Ignacio A. Santos, Medical School

Certifications and Licensures:

American Board of Internal Medicine - Certified in Nephrology

American Board of Internal Medicine - Certified in Internal Medicine

Texas State Medical License - Active

Ana Ortega, PA-C

Ana Ortega's education started at The University of Texas-Pan American, Edinburg, TX where she received a Bachelor of Science in Dietetics and Minor in Chemistry. She continued her education at The University of Texas Rio Grande Valley where she received her Master of Science degree and has been a Nephrology physician assistant for 3 years.

Ana Ortega works under the supervision of our Nephrology doctors, providing support and care to our Nephrology patients. She can assess patient symptoms, diagnose illnesses, and prescribe medications for patients with hypertension, hyperkalemia, chronic kidney disease, kidney failure, kidney transplantation and other kidney related illnesses. Ana speaks both English and Spanish.


Hospitals:

Valley Regional Medical Center -  Brownsville, TX 

Solara Specialty Hospital -  McAllen, TX 

Doctors Hospital at Renaissance (DHR Health) -  Edinburg, TX 

Copyright © 2025 Southern Texas Nephrology - All Rights Reserved.

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