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

Dr. Mark Stephan Ostrem, MD

Individual provider Geriatric Medicine (Internal Medicine) Physician · NPI 1811985633

Dr. Mark Stephan Ostrem, MD is an Internal Medicine in Quincy, Massachusetts. Graduated from University of Minnesota Medical School in 1976, 50 years ago. Practices with Pembroke Medical Associates Inc, a 26-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
50
Trained at
University of Minnesota Medical School
Licensed in
MA
In the registry since
2005
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

54 Miller St Ste 300
Quincy, MA 02169-4725
Phone: (617) 481-3300
Fax: (617) 481-3305
Show map & directions

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

Specialties & licences

Geriatric Medicine (Internal Medicine) Physician (primary) Taxonomy 207RG0300X · Licence 44501 (MA)

Record details

NPI number1811985633
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 6, 2005
Last updated in NPPESJanuary 15, 2018
Mailing address362 N Bedford St, East Bridgewater, MA 02333-1148

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesGERIATRIC MEDICINE
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 1976 (50 years in practice)
Group practice Pembroke Medical Associates Inc — 26 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Quincy