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

Karen E O'Brien, MD

Individual provider Maternal & Fetal Medicine Physician · NPI 1780623215

Karen E O'Brien, MD is an Obstetrics/Gynecology in South Weymouth, Massachusetts. Graduated from Georgetown University School of Medicine in 1996, 30 years ago. Practices with South Shore Medical Center, Inc, a 175-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
30
Trained at
Georgetown University School of Medicine
Licensed in
MA
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 →

Practice location Address checks out

55 Fogg Rd
South Weymouth, MA 02190-2432
Phone: (781) 624-8000
Show map & directions

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

Additional practice locations (2)

  • 330 Brookline Ave, Boston, MA 02215-5400 — (617) 667-4836
  • 51 Performance Dr, Weymouth, MA 02189-3141 — (781) 624-8000

Specialties & licences

Maternal & Fetal Medicine Physician (primary) Taxonomy 207VM0101X · Licence 218797 (MA)

Record details

NPI number1780623215
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 6, 2006
Last updated in NPPESOctober 19, 2023
Certification dateOctober 19, 2023

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice South Shore Medical Center, Inc. — 175 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount