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
Mailing addressPo Box 37086, Baltimore, MD 21297-3086

Other providers in Frederick