Marshall University Joan C. Edwards School of Medicine | Medical School, 1989
Doctor of Medicine (MD)
UC Health Holmes Hospital | Fellowship, 2007
Certifications
American Board of Internal Medicine | Other, 1999
American Board of Internal Medicine | Other, 1993
American Board of Internal Medicine | Other, 2007
Ratings and Reviews
The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.
4.9 / 5 (520 ratings, 10 comments)
Comments from patients
5 / 5
Dr Callahan is the best.
Reviewed March 03, 2026
5 / 5
Dr Callihan excellent at discussing options.
Reviewed March 03, 2026
5 / 5
Always willing to spend time to listen , asking questions to get more Info Very Knowledgeable , friendly
Reviewed March 03, 2026
5 / 5
Very thorough
Reviewed February 27, 2026
5 / 5
Took time to listen to my concerns..offered solutions for my care even contacted my dentist regarding issues dealing with blood thinner and my impending Proceedure. We need more offices like this one