Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Marc Stuart Ernstoff, MD

Individual provider Medical Oncology Physician · NPI 1275549073

Marc Stuart Ernstoff, MD is a Medical Oncology Physician in Frederick, Maryland. Licensed in New York. Registered with an NPI since 2006.

Licensed in
NY
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

5014 Judicial Way
Frederick, MD 21703-4807
Phone: (216) 559-6577
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 138461 (NY)

Record details

NPI number1275549073
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 1, 2006
Last updated in NPPESJuly 26, 2022
Certification dateJuly 26, 2022
Mailing address846 Main Street, Unit 1d, Buffalo, NY 14202-0001

Other providers in Frederick