North San Antonio Healthcare Associates

At North San Antonio Healthcare Associates, we provide primary medical care for the whole family. We treat people of all ages from newborns to those in their golden years. Our physicians are board certified in family practice. We understand the importance of total family health through every stage of life. We are delighted to have the opportunity to be your primary care provider. This website is our continued attempt to provide you with a resource of information to better serve you. It contains answers to the questions that most patients ask. However, if you have other questions, feel free to call our office (210) 822-3646.

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Patient Information

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Patient Information



Medication Refills

Test Results

Important Phone Numbers

Our Services

North San Antonio Healthcare Associates provides Comprehensive Primary Care:

Preventive Services

Physical Exams, Sports Physicals and Well Child Exams

Acute Care

Entire spectrum of acute problems

Chronic Condition Care

Spectrum of conditions such as Hypertension, Diabetes, COPD and Depression

Patient Education

Scroll down for educational health resources.


Scroll down to learn about the physicians of North San Antonio Healthcare Associates.

Gordon T. Hill, M.D.

Dr. Gordon Hill has been a physician in private practice since 1978. He is board certified in Family Practice as well as Geriatric Medicine. Dr. Hill was born and raised in Bryan, Texas and completed his undergraduate degree at Texas A&M University in 1970. Dr. Hill received his medical degree at the University of Texas Health Science Center at San Antonio and did his residency in Family Practice where he was chief resident his final year.

David J. Sandercock, D.O.

Dr. David Sandercock has been a physician with NSAHA since 1996. He is board certified in Family Practice. He completed medical school at the University of Osteopathic Medicine in Des Moines, Iowa and his internship at the University of Texas at Houston. He enjoys family practice because of its daily variety and the long term relationships that develop with patients. He also enjoys encouraging preventive care and a holistic approach to patient care. He and his wife Sharon have three daughters.

Walter Walthall, IV, M.D.

Dr. Walter Walthall has been a physician with North San Antonio Healthcare Associates since 2002. He is board certified in Family Practice. Dr. Walthall was born and raised in San Antonio, he received his medical degree from the University of Texas Medical School in Houston. Dr. Walthall believes in providing comprehensive medical care with emphasis on patient education and family values.

Clifford N. Alprin, M.D.

Dr. Clifford Alprin was born in Tulsa, Oklahoma and raised in Houston, Texas. He attended college at Baylor University in Waco and then Medical School at the University of Texas Health Science Center San Antonio. He completed his internship and residency in Family Medicine at the University of Oklahoma – Tulsa where he served as chief resident. He is married to his lovely wife, a pediatrician, Dr. Hawkins-Alprin and they have one son. Dr. Alprin believes in a patient first approach with an emphasis on preventative medicine.

Sarah C. Brown, PA-C

Sarah Brown is a NCCPA certified Physician Assistant (PA-C). She completed her master’s of Physician Assistant studies from UT Health Science Center in San Antonio where she was inducted into Pi Alpha, the National PA Honor Society. She completed her undergraduate degree from UW-Madison and is a proud badger. Sarah moved to Texas in 2007 working with the national program Teach For America. She enjoys working collaboratively with the physicians in the clinic to provide comprehensive, holistic care to all patients.

Patricia J. de Loyal, PA-C

Originally from Fuerth, Germany, PA Patricia de Loyal enjoyed working in the corporate world until she fulfilled her lifelong dream of becoming a Physician Assistant in 2015. She completed her undergraduate degree at UTSA and Masters of Physician Assistant Studies at the UT Health Science Center, and became a certified PA-C with the NCCPA shortly thereafter. With a background in Orthopedics and Family Practice, PA de Loyal joined North San Antonio Healthcare Associates in 2016.

Contact Us

    North San Antonio Healthcare Associates
    3338 Oakwell Court, Suite 107
    San Antonio, Texas 78218
    (210) 822-3646
    Fax (210) 822-5242

We are located in the Oakwell Medical Office Building at 3338 Oakwell Court, Suite 107. This building is on Oakwell Court off Harry Wurzbach 4 stoplights inside Loop 410.

Our office hours are Monday - Thursday 8:00am - 5:00pm and 8:00am - 4:00pm on Friday.