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Coryell Medical Clinic

Clinic front1507 West Main Street
Gatesville, TX 76528
(254) 865-2166
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Coryell Medical Clinic is dedicated to serving the health needs of Gatesville and the surrounding communities. To meet the growing need for quality medical care, we have built a large new facility that has room for six providers, a comfortable waiting area and beautiful finishes.

Medical providers include Dr. J.D. Sheffield, Dr. Jill Clay, Dr. Diedra Wuenschel, Dr. Bertha Gaytan, Dr. Mark Gibby, Dr. Colby Cessnun, Dr. Sheldon Chaffer, Dr. Dustin Smith, Dr. Tim Maynard, Dr. Steve Norris, Dr. Aaron Humphreys and Physician Assistants Natalie Kortis and Kim Jacobs, along with Family Nurse Practitioners' Kathileen Boozer and Brenda Hoover.  With the increased number of providers, we are able to accommodate with same day appointments in most cases. Our providers are here to meet the needs of patients of all ages, including children. CMC also has a new electronic medical record system that integrates clinic and hospital records to allow for coordinated care.


  • Routine exams and medical care
  • Childhood vaccinations
  • Flu and pneumonia shots
  • Sports and pre-op physicals
  • Treatment of chronic conditions
  • Minor emergency care
  • Treatment for infants through elderly
  • X-rays and lab work
  • Specialty Care through affiliated Specialists:
    • Podiatry
    • Pre-natal care
    • Allergy & Asthma
    • Pulmonology
    • Cardiology
    • Urology
    • General Surgery
    • Orthopedics
    • ENT (ear, nose, throat)
    • Pain Management
    • Sleep Study Center
    • Spine & Neurosurgery


Coryell Medical Clinic AppointmentsAppointments are available at Coryell Medical Clinic for new or existing patients. The clinic's hours are Monday through Friday, 8 a.m. - 5 p.m.  To schedule an appointment, please call (254) 865-2166 during these business hours. 

For acute/urgent care needs we are open Monday - Friday 5 p.m. - 7 p.m. and Saturday 8 a.m. - 12 p.m. 

Coryell Medical Clinic is located adjacent to the Coryell Memorial Hospital entrance. If you are traveling west on Highway 84/Main Street, you will turn right onto Memorial Drive and pull into the hospital and clinic parking lot on your left.

Please check-in 15 minutes before your scheduled appointment time.


Coryell Memorial ClinicCoryell Medical Clinic accepts most insurances and is in-network with the following:

  • Medicare
  • Medicaid
  • FirstCare
  • Scott & White Health Plan
  • USA Managed Care
  • Aetna
  • Blue Cross/Blue Shield
  • Cigna HealthCare
  • United Healthcare
  • TriCare/Humana Military Healthcare Services
  • Coventry (Mail Handlers)


Clay, N. Jill MD View Profile
Specialties: Family Medicine

Gaytan, Bertha MD View Profile
Specialties: Family Medicine

Gibby, Mark MD View Profile
Specialties: Family Medicine

Kortis, Natalie PA-C View Profile
Specialties: Family Medicine

Sheffield, JD DO View Profile
Specialties: Family Medicine

Wuenschel, Diedra DO View Profile
Specialties: Family Medicine