Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Gregory Thomas O'Conor Jr., MD

Individual provider Hematology & Oncology Physician · NPI 1285602680

Gregory Thomas O'Conor Jr., MD is a Hematology & Oncology Physician in Lancaster, Pennsylvania. Licensed in Pennsylvania. Registered with an NPI since 2006.

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

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Practice location Address checks out

2106 Harrisburg Pike Ste 116
Lancaster, PA 17601-2644
Phone: (717) 544-3600
Fax: (717) 544-3604
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence MD022623E (PA)

Record details

NPI number1285602680
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 10, 2006
Last updated in NPPESFebruary 1, 2010

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