Dr. Thomas Defer, MD

With 20 years of practice, Dr. Thomas Defer is an established internal medicine provider, MD, after earning their medical degree at University Of Missouri, Columbia School Of Medicine in 1989. Dr. currently practices across 2 facilities, including Washington University in Saint Louis, Missouri. Their National Provider Identifier (NPI) is 1023036464, and the profile below combines data from CMS NPPES, Medicare billing records, the HHS OIG exclusion list, and — where available — CMS Open Payments, Medicare Utilization, and Part D prescriber summaries.

Dr. Thomas Defer's practice is located in ZIP 63110 (Saint Louis, Missouri), which has an overall CartoChrome Healthcare Access Score of 97/100 (Healthcare Paradise). Patients in this area have comparatively strong access to primary care, specialists, and hospital services.

CMS Medicare data shows Dr. Thomas Defer as a lower-volume internal medicine provider, treating approximately 145 Medicare beneficiaries and delivering 292 services in the most recent reporting year. That panel size indicates a smaller, more selective practice pattern.