License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. Brian Callahan:

View the full profile to get information on:

  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. Brian Callahan is Poor. Dr. Callahan has been reviewed by 1 patients who have provided 1 comments. The rating is 1 out of 5 stars.

Patient Ratings
Ease of Appointment 1.0
Promptness 1.0
Courteous Staff 1.0
Accurate Diagnosis 1.0
Bedside Manner 1.0
Spends Time with Me 1.0
Follows Up After Visit 1.0

Specialties & Research

Dr. Brian Callahan, MD is board certified in Diagnostic Radiology.

  • He has special expertise in 1 area:
  • Gallbladder Diseases

Education & Awards

Dr. Callahan graduated from UMDNJ Robert Wood Johnson, Piscataway.


Dr. Callahan has 2 hospital affiliations:

  • -Holy Family Hospital 
  • Brooke Army Medical Center 


  • Spanish

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Additional Information
Dr. Brian Thomas Callahan MD is a male Diagnostic Radiologist, has 7 years of experience and practices in Diagnostic Radiology.
Where does Dr. Brian T. Callahan practice?
Dr. Brian Callahan has 1 office location.
Dr. Brian Callahan practices Diagnostic Radiology near San Antonio, TX.
See San Antonio Radiologists.