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

Dr. Brian O'Connor, MD

Individual provider Hematology & Oncology Physician · NPI 1174515050

Dr. Brian O'Connor, MD is a Hematology & Oncology Physician in Frederick, Maryland. Works from 2 locations. Licensed in Maryland.

Licensed in
MD
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1562 Opossumtown Pike
Frederick, MD 21702-4337
Phone: (301) 662-8477
Show map & directions

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

Additional practice locations (1)

  • 501 W 7th St, Frederick, MD 21701-4507 — (301) 662-8477

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence D31761 (MD)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence D0031761 (MD)

Record details

NPI number1174515050
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 17, 2005
Last updated in NPPESMay 15, 2019

Other providers in Frederick