Providers

Nabeel K. Ahmed, MD.

NABEEL K. AHMED, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Ahmed was born in Pakistan, came to the United States of America as a young boy and was raised in Texas. He earned his medical degree from Allama Iqbal Medical College in Lahore, Pakistan. He completed his Internal Medicine internship and residency at the University of Nevada – Reno and his Nephrology fellowship at The University of Texas Southwestern Medical Center at Dallas. Dr. Ahmed is Board Certified in Nephrology and joined our practice in 1999.

Dr. Ahmed is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. He is a member of the CTMF Pharmacy and Therapeutic Committee. He is certified as a Dialysis Access Interventionalist and is a member of the American Society of Diagnostic and Interventional Nephrology. He is also a member of the Smith County Medical Society, Renal Physicians Association, and Texas Medical Association. Professionally, he is particularly interested in dialysis access issues and acute kidney injury. Dr. Ahmed is the Medical Director at West Tyler Dialysis and The Dialysis Access Center of Tyler.

Corey D. Ball, MD.

COREY D. BALL, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Ball was born and raised in Lubbock, Texas. He completed his education at Texas Tech University School of Medicine in Lubbock, earning his medical degree. He continued his education there completing his Internal Medicine internship, residency, and Nephrology fellowship. Dr. Ball is Board Certified in Nephrology and joined our practice in 2008. 

Dr. Ball is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. He is the Section Chair of Nephrology at Christus Trinity Mother Frances Hospital, where he also serves on the Joint Dialysis Oversight Committee. He is the Chief of Medicine and Section Chair of Nephrology at UT Health Tyler and serves on the Patient Care Committee and the UT Medical Executive Committee. He is a member of the Smith County Medical Society and Texas Medical Association. Dr. Ball is the Medical Director at Mineola Dialysis and serves as the Supervising Physician for The Centers for Kidney Care Advanced Practitioner Team.

James R. Cotton Jr. MD.

JAMES R. COTTON, JR., MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Cotton is from Midland, Texas, and attended The University of Texas Medical Branch at Galveston, where he earned his medical degree and completed his Internal Medicine internship, residency and Nephrology fellowship. He proudly served in the United States Navy as a physician prior to going into private practice. Dr. Cotton is Board Certified in both Internal Medicine and Nephrology and joined our practice in 1978. 

Dr. Cotton is a Nephrologist in Tyler, on Affiliate Staff at UT Health Tyler, has active continuity of care privileges at Christus Trinity Mother Frances Hospital, and courtesy privileges at Paris Regional Medical Center. He holds positions on the Fresenius Medical Care – Medical Advisory Boards at the corporate level and for the West Region. Dr. Cotton is the Medical Director at the Palestine Dialysis Unit. He is a member of the Renal Physicians Association, Smith County Medical Society and Texas Medical Association.       

In addition to his medical practice, Dr. Cotton is the Chairman of the Board of Directors and co-founder of Cumberland Academy in Tyler.

Stefanie M. Diaz, MD

STEFANIE M. DIAZ, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Diaz is a native of Brazil and earned her medical degree from Fundacao Tecnico Educacional Souza Marques in Rio de Janeiro, Brazil.  She completed her Internal Medicine internship and residency at Finch University Health Sciences, Chicago Medical School, and her Nephrology fellowship at The University of Texas Southwestern Medical Center at Dallas. Dr. Diaz is Board Certified in Nephrology and joined our practice in 1999.

Dr. Diaz is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. She is a member of the Smith County Medical Society and Texas Medical Association. Dr. Diaz is the Medical Director of the Tyler Home Dialysis Program.

Mingiziem A. Emiru, MD.

MINGIZIEM EMIRU, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Emiru was born and raised in Ethiopia, where he completed medical school at the Jimma Health Science Institute. He completed his Internal Medicine internship and residency at the State University of New York Health Science Center at Brooklyn, and Nephrology fellowship at the State University of New York at Buffalo. Dr. Emiru is Board Certified in Internal Medicine and Nephrology and joined our practice in 2004. 

Dr. Emiru is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. He is certified as a Dialysis Access Interventionalist and is a member of the American Society of Diagnostic and Interventional Nephrology. He is a member of the Smith County Medical Society and Texas Medical Association. Dr. Emiru is the Medical Director at the Jacksonville Dialysis and Watson Wise Dialysis Units.

Roy D. Gerard Jr., MD.

ROY D. GERARD, JR., MD, FACP
BOARD CERTIFIED IN NEPHROLOGY

Dr. Gerard grew up in Houston, Texas and earned his medical degree from The University of Texas Health Science Center at San Antonio. He completed his Internal Medicine internship and residency at the University of Virginia, Roanoke, and Nephrology fellowship at The University of Texas Southwestern Medical Center at Dallas. Dr. Gerard is Board Certified in Internal Medicine and Nephrology and joined our practice in 1991.

Dr. Gerard is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. He serves on the Peer Review and By-Law Committees at UT Health Tyler. He is a member of Renal Physicians Association, American Society of Nephrology, American College of Physicians, Smith County Medical Society and Texas Medical Association. 

Dr. Gerard has special medical interest in post-transplant care, dialysis, and hypertension. He is the Medical Director at Carthage Dialysis, Paris Dialysis, and Idabel, OK Dialysis units.

Mark W. Greenwell, MD.

MARK W. GREENWELL, MD, FACP, FNKF
BOARD CERTIFIED IN NEPHROLOGY

Dr. Greenwell was born in Chicago, Illinois. He completed his medical school at the University of Texas Health Science Center at Houston, and his Internal Medicine and Pediatrics internship, residency and Nephrology fellowship at the University of Tennessee Health Science Center – Memphis. Dr. Greenwell is Board Certified in Internal Medicine and Nephrology and joined our practice in 2012. 

Dr. Greenwell is a Nephrologist in Paris, on active staff at Paris Regional Medical Center and serves on the Paris Regional Medical Center Medicine Peer Review Committee. He is a member of the American College of Physicians, American Society of Nephrology, National Kidney Foundation, Lamar-Delta County Medical Society and Texas Medical Association. Dr. Greenwell see patients in both Paris, Texas and Idabel, Oklahoma.

Alpesh R. Jethva, MD.

ALPESH R. JETHVA, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Jethva was born in Chicago, Illinois and moved to Texas as a young boy. He attended The University of Texas Health Science Center at Houston, where he earned his medical degree and completed his Internal Medicine internship, residency, and Nephrology fellowship. Dr. Jethva is Board Certified in Nephrology and joined our practice in 2001.

Dr. Jethva is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital and has courtesy privileges at Paris Regional Medical Center. He currently services on the UT Health Tyler Utilization Review Committee. He is certified as a Dialysis Access Interventionalist and is a member of the American Society of Diagnostic and Interventional Nephrology. He is a member of the American Society of Nephrology, Renal Physicians Association, Smith County Medical Society, and Texas Medical Association.

Dr. Jethva is the Medical Director at UT Health Tyler Acute Hemodialysis, Christus Trinity Mother Frances Rehabilitation Hospital Acute Hemodialysis, and Titus County Dialysis in Mt. Pleasant.

Alpesh R. Jethva, MD.

MADELINE JIMENEZ, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Jimenez was born and raised in Puerto Rico, and earned her medical degree from the Iberoamerican University in the Dominican Republic.   She completed her Internal Medicine residency at the Ponce School of Medicine in Ponce, Puerto Rico, and her Nephrology fellowship at Louisiana State University in Shreveport, Louisiana.   Dr. Jimenez is Board Certified in Internal Medicine and Nephrology and joined our practice 2018. 

Dr. Jimenez is a Nephrologist in Tyler, on active staff with UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center.   She is a member of the American Society of Nephrology, the National Kidney Foundation, Smith County Medical Society and Texas Medical Association.   Special interest in her field of practice includes hypertension and chronic kidney disease. 

Dr. Jimenez is fully bi-lingual in both English and Spanish.

Rudrick V. Ledesma, MD.

RUDRICK V. LEDESMA, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Ledesma was born and raised in the Philippines, Cebu Doctor’s University of Medicine in Mandaue City, Cebu, Philippines. He completed his Internal Medicine internship, residency and Nephrology fellowship at Westchester Medical Center in Valhalla, New York. Dr. Ledesma is Board Certified in Internal Medicine and Nephrology and joined our practice in 2016.

Dr. Ledesma is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. He is a member of the Smith County Medical Society and Texas Medical Association. Special interest in his field of practice include Acute Kidney Injury, Hypertension and Hemodialysis. Dr. Ledesma is the Medical Director at Gilmer Dialysis Unit.

Aideloje A. Onime, MD.

AIDELOJE A. ONIME, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Onime was born and raised in Nigeria. He completed his medical school at the University of Lagos College of Medicine in Nigeria. His completed his Internal Medicine internship and residency at Harlem Hospital Center – Columbia University in New York City, and his Nephrology fellowship was completed at the University of New Mexico Health Science Center in Albuquerque, New Mexico. Dr. Onime is Board Certified in Nephrology and joined our practice in 2013. 

Dr. Onime is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regionals Medical Center. He currently serves on the Christus Trinity Mother Frances Medicine Peer Review Committee. He is a member of the Renal Physicians Associations, Smith County Medical Society and Texas Medical Association. Dr. Onime is the Medical Director at Renal Center Tyler and Renal Center Waterton Dialysis units.

Charles O. Orji, MD.

CHARLES O. ORJI, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Orji was born in Nigeria and raised in Houston, Texas. He earned his medical degree from the University of Texas Health Science Center at San Antonio and then completed his Internal Medicine internship, residency, and Nephrology fellowship at the University of Texas Medical School – Houston. Dr. Orji is also a Registered Pharmacist and served in the Texas Army National Guard Reserves for eight years.  Dr. Orji is Board Certified in Nephrology and joined our practice in 2003.

Dr. Orji is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. In addition, he serves on the Fresenius Medical Care (FMC) Pharmacy and Therapeutics Committee, the FMC Pharmacy Advisory Committee, UT Health East Texas Specialty Hospital Medical Executive Committee, UT Health Tyler Medication Use Team and Pharmacy and Therapeutic Committees. He also serves on the Christus Trinity Mother Frances Hospital Peer Review Committee, is on the Board of Directors for Alliant Health Solutions, and is the Board Chairman for the End Stage Renal Disease Network 14.

Dr. Orji is certified as a Dialysis Access Interventionalist and is a member of the American Society of Diagnostic and Interventional Nephrology. He is also a member of the American Society of Nephrology, American College of Physicians, Smith County Medical Society, and Texas Medical Association. Dr. Orji serves as the Medical Director at the Southeast Tyler Dialysis Unit.

Ifeatu U. Oti, MD.

OSIYEMI O. OSINOWO
BOARD CERTIFIED IN NEPHROLOGY

Dr. Osinowo was born and raised in Nigeria and earned his medical degree from Olabisi Onabanjo University in Nigeria. He completed his Internal Medicine internship and residency at Joan C. Edwards School of Medicine at Marshall University, and his Nephrology fellowship at The University of Toledo. Dr. Osinowo is Board Certified in Internal Medicine and Nephrology and joined our practice in 2018.

Dr. Osinowo is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. He is a member of the American College of Physicians, American Society of Nephrology, Smith County Medical Society and Texas Medical Association. Special interest in his field of practice include hypertension, acid base disorders and renal transplant.

Ifeatu U. Oti, MD.

IFEATU U. OTI, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Oti was born and raised in Nigeria, and earned her medical degree from the University of Nigeria. She completed her Internal Medicine internship and residency at the Wright State University School of Medicine in Dayton, Ohio, and her Nephrology fellowship at Allegheny General Hospital, in Pittsburgh, Pennsylvania. Dr. Oti is Board Certified in Nephrology and joined our practice in 2010.

Dr. Oti is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital. She is a member of the Smith County Medical Society and Texas Medical Association. 

Dr. Oti has special medical interest in CKD, hypertension, and hyponatremia. She is the Medical Director at Sulphur Springs Dialysis.

Stephen D. Pamatmat, MD.

STEPHEN D. PAMATMAT, MD
BOARD CERTIFIED IN NEPHROLOGY

Dr. Pamatmat was born and raised in the Philippines, and earned his medical degree from the University of Santo Tomas in Manila, Philippines. He completed his Internal Medicine internship, residency, and Nephrology fellowship at St. John Hospital and Medical Center in Detroit, Michigan. Dr. Pamatmat is Board Certified in Nephrology and joined our practice in 2002.

Dr. Pamatmat is a Nephrologist in Tyler, on active staff at UT Health Tyler and Christus Trinity Mother Frances Hospital, and has courtesy privileges at Paris Regional Medical Center. Dr. Pamatmat is on the Christus Trinity Mother Frances Critical Care Committee and serves as the Lab Director for The Centers for Kidney Care. He is a member of the American Society of Nephrology, the Renal Physicians Association, Smith County Medical Society and Texas Medical Association. He is certified as a Dialysis Access Interventionalist and is a member of the American Society of Diagnostic and Interventional Nephrology. Dr. Pamatmat is the Medical Director at Henderson County Dialysis in Athens, Texas.

Advanced Practitioners

Holly Bottoms, MSN, AGNP-C

HOLLY BOTTOMS, MSN, AGNP-C
NURSE PRACTITIONER

Mrs. Bottoms was born and raised in Tennessee and earned her nursing degree from Chamberlain College of Nursing in Downers Grove, Illinois. After working several years as an RN, she obtained her Master of Science in Nursing degree from Southern Adventist University School of Nursing in Tennessee becoming a nurse practitioner with a focus in Adult Gerontology. Mrs. Bottoms is certified by the American Academy of Nurse Practitioners and joined our practice in 2015.

Mrs. Bottoms is a member of the American Association of Nurse Practitioners. She works directly with the physicians at The Centers for Kidney Care, in the Tyler office, providing care for our patients in the clinic setting (general nephrology and post-transplant) as well as in hemodialysis and home dialysis units.

Diana LaBumbard, Nurse Practitioner

DIANA LABUMBARD, ACNP-BC
NURSE PRACTITIONER

Mrs. LaBumbard was born in Ft Worth, Texas and raised in Southern California and Michigan. She earned her nursing degree from Texas Woman’s University in Houston. After working several years as an RN, she obtained her Master of Science in Nursing degree from Wayne State University in Detroit, Michigan becoming a nurse practitioner with a focus in Acute Care. Mrs. LaBumbard is certified through the American Nurses Credentialing Center and joined our practice in 2017.

Mrs. LaBumbard is a member of the East Texas Nurse Practitioners Association and the Gerontological Advanced Practice Nurses Association. She works directly with the physicians at The Centers for Kidney Care, in the Tyler office, providing care for our patients in the clinic setting as well as in hemodialysis units.

Alice Thomas, Nurse Practitioner

ALICE THOMAS, MSN, FNP-C
NURSE PRACTITIONER

Ms. Thomas was born and raised in Nigeria and earned her Bachelor of Science in Nursing from Salem State College in Salem, Massachusetts. She worked in the renal field as an RN and Facility Manager at Fresenius Medical Care while obtaining her Master of Science in Nursing – Family Nurse Practitioner degree from Maryville University in St. Louis, Missouri. Ms. Thomas is certified by the American Academy of Nurse Practitioners and joined our practice in 2017.

Ms. Thomas is a member of the American Nephrology Nurses Association, the American Association of Nurse Practitioners, and Sigma Theta Tau International Honor Society of Nursing. She proudly served in the United States Army Reserve for eight years. Ms. Thomas works directly with the physicians at The Centers for Kidney Care, in the Tyler office, providing care for our patients in the clinic setting as well as in hemodialysis units.

Diana LaBumbard, Nurse Practitioner

DEBORAH J. ELMORE, RN, MSN, FNP-BC
NURSE PRACTITIONER

Ms. Elmore was born in Paris, Texas and raised in Mesquite, TX. She earned her nursing degree from Paris Junior College. After working several years as an RN, she obtained her Master of Science in Nursing degree from Walden University in Minneapolis, MN becoming a nurse practitioner. Ms. Elmore is board certified by the American Nurses Credentialing Center and joined our practice in 2017.

Ms. Elmore is a member of the American Association of Nurse Practitioners. She works directly with the physicians at The Centers for Kidney Care, in the Paris office, providing care for our patients in the clinic setting as well as in hemodialysis and home dialysis units in Texas and Oklahoma.

Holly Bottoms, MSN, AGNP-C

SHANNON JOHNSTON, RN, MSN, FNP-BC
NURSE PRACTITIONER

Ms. Johnston was born in Mt Vernon, Texas and was raised in Arlington and Paris, Texas. She earned her nursing degree from Paris Junior College. After working several years as an RN, she obtained her Master of Science in Nursing degree from Walden University in Minneapolis, MN becoming a nurse practitioner. Ms. Johnston is board certified by the American Nurses Credentialing Center and joined our practice in 2017.

Ms. Johnston is a member of the American Association of Nurse Practitioners. She works directly with the physicians at The Centers for Kidney Care, in the Paris office, providing care for our patients in the clinic setting as well as in hemodialysis and home dialysis units in Texas and Oklahoma.

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Appointments by referral only.