Board Certification

  • Family Medicine



Hospice and Palliative Care at University of Texas Health Science Center-San Antonio

Internship and Residency

Knapp Medical Center, Weslaco, TX; Doctors Hospital at Renaissance, Edinburg, TX

Medical School

Universidad Autonoma de Guadalajara/New York Medical College (NYMC)


Texas Tech University, Lubbock, TX

Hospital Affiliated With

Christus Santa Rosa-San Marcos

Professional Associations

American Academy of Family Physicians

Texas Medical Association

Texas Academy of Family Physicians

Personal Interests

Dr. Castillo and Dr. Moreno are parents to three children, ages 14, 7, and 2. Together they enjoy staying active by going for jogs, family bike riding, and hiking. Having weekly family movie nights on the weekend is also fun.


Dr. Diego Moreno was born and raised in Austin, TX. He attended Texas Tech University in Lubbock for his undergraduate studies where he earned his bachelor of science in Biology with a double minor in Chemistry and Spanish. Dr. Moreno completed his Family Medicine residency at Knapp Medical Center and Doctor’s Hospital at Renaissance (DHR) in 2020 in South Texas with the University of Texas Rio Grande Valley. He now is pursuing a subspecialty in Hospice and Palliative Medicine at the University of Texas Health Science Center in San Antonio. Dr. Moreno is a Captain with the United States Air Force.