Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William Thomas Callahan, MD

Individual provider Specialist · NPI 1356344535

William Thomas Callahan, MD is a Specialist in Gainesville, Georgia. Licensed in Georgia. Registered with an NPI since 2005.

Licensed in
GA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

663 Lanier Park Dr
Gainesville, GA 30501
Phone: (770) 536-8109
Fax: (770) 536-3203
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Specialist (primary) Taxonomy 174400000X · Licence 14469 (GA)

Record details

NPI number1356344535
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 23, 2005
Last updated in NPPESMay 29, 2008
Mailing address663 Lanier Park Dr, Gainesville, GA 30501-2059

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