Dr. Mark Fesler, MD

With 20 years of practice, Dr. Mark Fesler is an established hematology/oncology provider, MD, after earning their medical degree at Saint Louis University School Of Medicine in 2003. Dr. currently practices at Washington University in Saint Louis, Missouri. Their National Provider Identifier (NPI) is 1235204066, 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.

CMS Medicare data shows Dr. Mark Fesler as a lower-volume hematology/oncology provider, treating approximately 223 Medicare beneficiaries and delivering 1K services in the most recent reporting year. That panel size indicates a smaller, more selective practice pattern.

Under the Physician Payments Sunshine Act, CMS reports that Dr. Mark Fesler received $156K in industry payments in 2023. Payments at this scale are elevated relative to most providers and may warrant direct inquiry about potential conflicts of interest during your visit.