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).
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The overall average patient rating of Dr. Brian Callahan is Poor.
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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
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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.