About GARY BREWTON. Gary Brewton is an internal medicine provider established in Houston, Texas and his medical specialization is internal medicine. The NPI number of Gary Brewton is 1750384095 and was assigned on May 2005. The practitioner's primary taxonomy code is 207R00000X with license number F9238 (TX). The provider is registered as an individual and his NPI record was last updated 8 ....