About KENT WALKER. Kent Walker is a provider established in Ottumwa, Iowa and his medical specialization is dermatology with more than 33 years of experience. He graduated from Tulane University School Of Medicine in 1989. The NPI number of Kent Walker is 1376519033 and was assigned on February 2006. The practitioner's primary taxonomy code is 207N00000X with license number 29726 (IA)..