MEET THE PROVIDERS

JOSEPH DIAZ, M.D. | Medical Director - AllergySA - San Antonio Allergist - Asthma

JOSEPH DIAZ, MD | Medical Director

San Antonio-born, Dr. Diaz followed in his father’s footsteps, Jose A. Diaz, M.D., family practitioner, who had a successful medical practice on the south side of San Antonio for 30 years.

Dr. Diaz graduated from St. Mary’s University in San Antonio, with high honors and a B.S. in Biology. He received his medical degree from the University of Texas Medical Branch at Galveston, Texas. His internship and residency, as well as his fellowship in Allergy and Immunology, was completed at the University of South Florida College of Medicine. Since opening his private practice, Allergy, Asthma and Immunology Associates of South Texas in 1988, Dr. Diaz has served as clinical assistant professor in the Department of Internal Medicine at the University of Texas Health Science Center in San Antonio. He was appointed Co-Director of the Allergy/Clinic Immunology Fellowship training program and directed the program for several years.

In addition to his private practice, Dr. Diaz is the President and Medical Director of Allergy and Asthma Research Center, established in 1989. As Medical Director of the Research Center, Dr. Diaz says his patients benefit from access to new medicines and information not yet available to most physicians or patients. In Dr. Diaz’ free time, he enjoys physical fitness, competing in Iron Man competitions and spending time with family.

LUKENA KARKHANIS, M.D. | Board Certified - AllergySA - San Antonio Allergist - Asthma

LUKENA KARKHANIS, MD | Diplomate, American Board of Allergy and Immunology

Dr. Karkhanis joined Allergy SA in 2014. Dr. Karkhanis is board certified in Internal Medicine and Allergy and Immunology. Dr. Karkhanis received her medical degree with honors from Seth G.S. Medical College and K.E.M. Hospital in Mumbai, India. She was engaged in research activities at the University of Pittsburgh, after which she completed her internship and residency in Internal Medicine at St. Luke’s-Roosevelt Hospital Center and Columbia University in New York, New York and her fellowship in Allergy and Immunology from Washington University School of Medicine and Barnes-Jewish Hospital in St. Louis, Missouri.

She is an active participant in national allergy meetings, and has presented and published multiple reports. She is also an active member of the following organizations: American Academy of Allergy, Asthma, and Immunology, American College of Allergy, Asthma, and Immunology, Texas Medical Association, Texas Allergy, Asthma, and Immunology Society and San Antonio Allergy, Asthma, and Immunology Society. Dr. Karkhanis works with pediatric and adult patients to help treat allergies and asthma.

She also serves as a Sub-Investigator on several studies at the Allergy and Asthma Research Center, which keeps her abreast of the latest developments in the field. In her spare time, she enjoys art, literature, culinary experimentation and spending time with her family.

Marie Celeste Loera, MSN, FNP-BC | Nurse Practitioner Board Certified - AllergySA - San Antonio Allergist - Asthma

MARIE CELESTE LOERA, FNP-BC | Nurse Practitioner, Board-Certified

Ms. Loera joined Allergy SA in January 2012. A native of San Antonio, she attended Health Careers High School and earned her BSN from the UT Health Science Center at San Antonio. During her postgraduate studies at UTHSC, she was inducted into the Sigma Theta Tau International Nursing Honor Society and completed the Family Nurse Practitioner Program with a Master of Science in Nursing degree in 2011. She is dedicated to the fundamentals of her practice and is committed to providing compassionate, patient-centric care, tailored to the individual.

She is a member of the American Nurses Association, Texas Nurses Association, National Association of Hispanic Nurses, American Association of Nurse Practitioners and the Texas and San Antonio Allergy, Asthma and Immunology Society. She provides supervision and instruction as a Clinical Preceptor for The University of Texas Health Science Center.

She is very passionate about community leadership programs and serves as an Anaphylaxis Community Expert (ACE). The ACE Program seeks to raise awareness, reduce anxiety and minimize the loss of life due to anaphylaxis through their use of education, advocacy and outreach efforts. Ms. Loera values strong family ties and enjoys spending free time with family, friends, and her two dogs. She likes music, the Spurs, HGTV and participating in outdoor activities.

ERICA GOMEZ, MSN, FNP-C | Nurse Practitioner Certified - San Antonio Allergist - Asthma

ERICA GOMEZ, FNP-C | Nurse Practitioner, Certified

Mrs. Gomez joined Allergy SA in September 2014. She is fluent in English and Spanish and is certified by the American Association of Nurse Practitioners. Mrs. Gomez obtained her Master’s of Science degree in nursing with specialization in family nurse practitioner at the University of Texas Health Science in San Antonio (UTHSCSA) in August 2014, and prior to this also received her Bachelor’s of Science degree in nursing at UTHSCSA in 2010.

Mrs. Gomez is a highly motivated individual who has advanced from medical assistant to registered nurse and, now, a family nurse practitioner. She is experienced in treating both pediatric and adult populations. Mrs. Gomez enjoys learning about each of her patients, and strives to provide excellent patient care. In her free time, she enjoys spending time with her family and friends.

Alisha Diaz, PA-C | Physician Assistant Certified

ALISHA DIAZ, PA-C | Physician Assistant, Certified

Ms. Diaz joined AllergySA in September 2019 and is certified by the National Commission on Certification of Physician Assistants. In 2014 she earned a Bachelor of Arts in Psychology from Southern Methodist University in Dallas, Texas and a Master of Science in Physician Assistant Studies in 2019 from the University of St. Francis in Albuquerque, New Mexico.

A native San Antonian, Ms. Diaz has returned home to begin her career as a Physician Assistant with AllergySA. She is dedicated to building a trusting relationship with her patients and has been described as sweet, kind and caring. Ms. Diaz is currently seeing pediatric and adult patients at our Stone Oak and Medical Center clinics. In her free time, she enjoys traveling and being an aunt to her three adorable nephews.