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

Dr. Thomas Patrick O'Connor Jr., MD

Individual provider Internal Medicine Physician · NPI 1669507141

Dr. Thomas Patrick O'Connor Jr., MD is a Hematology/Oncology in Weymouth, Massachusetts. Graduated from State University of New York at Buffalo School of Medicine in 2001, 25 years ago. Practices with Dana-Farber Cancer Institute, Inc, a 668-clinician group, accepts Medicare assignment and offers telehealth. Licensed in District of Columbia and Massachusetts.

Years since qualifying
25
Trained at
State University of New York at Buffalo School of Medicine
Licensed in
DC, MA
In the registry since
2007
Specialties on file
2
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

51 Performance Dr Ste #110
Weymouth, MA 02189-3141
Phone: (781) 337-9091
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD035011 (DC)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence 231774 (MA)

Record details

NPI number1669507141
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 23, 2007
Last updated in NPPESJanuary 21, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolSTATE UNIVERSITY OF NEW YORK AT BUFFALO SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice Dana-Farber Cancer Institute, Inc. — 668 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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