Bexar Diagnostic Medicine Associates Bexar Diagnostic  Medicine Associates  

Welcome to Innovative Clinical Trials & Bexar Diagnostic Medicine Associates

Bexar Diagnostic Medicine Associates is dedicated to providing excellence in Internal Medicine and Neurology care. Drs. Duncan McCarroll and James Garrison III have over 50 combined years of experience caring for patients in the South Texas region.  We hope you find what you're looking for on our website. To learn more about our practice, please contact us.

Our Services

We strive to provide a comfortable and welcoming environment for both new and existing patients. Dr. Garrison and Dr. McCarroll also own and operate Innovative Clinical Trials, a division of Bexar Diagnostic Medicine Associates, so that they might offer their patients the very latest in cutting edge medicine. To learn more about clinical trial opportunities, click here.

Your Visit

The staff at Bexar Diagnostic Medicine Associates takes pride in providing the very best customer service possible to our patients. If you are a new patient, please download the patient registration forms, fill them out and bring them to your first appointment. If you are an existing patient and have a question or concern, please call us at 210-692-3362 or click here to contact us via email.

Connect With Us

Social media savvy? Then join us on Facebook for more news, information and alerts about Innovative Clinical Trials!

NEW! Pay your bill online!

Bexar Diagnostic Medicine Associates now offers online bill pay! 


To set up your account, go to


You will need your account number as found on your bill in order to set up online payment. To find our practice within the InstaMed link, type BDMA in the ‘Find a Provider’ field. 


Where to Find Us:

Bexar Diagnostic Medicine Associates/Innovative Clinical Trials
5430 Fredericksburg Rd, Suite 400
San Antonio, TX 78229

Phone: 210-692-3362



Office Hours

Our practice is open for appointments and consultations during the following hours:


Monday-Friday 8:00 AM-5:00 PM

Closed from 12:30 PM-1:30 PM for lunch

Practice News

Get the latest news from our practice right here on our website.

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