DR. Thomas William Callan, M. D. is a hematology and oncology internal medicine in El Cajon, CA. The provider is an internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered. DR. Thomas William Callan, M. D. NPI is 1699911487. The provider is registered as an individual entity type. The NPPES NPI record indicates the provider is a male.
The provider's business location address is:
230 CAJON VIEW DR EL CAJON, CA ZIP 92020-502 Phone: (619) 440-4421 Fax: (619) 593-2120
The enumeration date for this NPI number is 12/28/2008 and was last updated on 3/7/2023.
The NPI record includes the healthcare provider taxonomy classification, state license number and state of licensure. The following information regarding the scope of practice of this provider is available:
NPI stands for National Provider Identifier. The NPI is a 10-digit identification number that is completely unique. The NPI number by itself does not contain any identifiable information such as a provider’s speciality or location. The NPI is assigned to individuals or organizacions for their lifespan and it is independent of key provider information type updates like a change of practices, location or speciality.
This page was last updated on: 11/21/2025
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