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

Mark Donald Hornstein, MD

Individual provider Reproductive Endocrinology Physician · NPI 1720038276

Mark Donald Hornstein, MD is an Obstetrics/Gynecology in Boston, Massachusetts. Graduated from University of Cincinnati College of Medicine in 1982, 44 years ago. Practices with Massachusetts General Physicians Organization Inc, a 3,484-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
44
Trained at
University of Cincinnati College 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.

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Practice location Address checks out

55 Fruit St
Boston, MA 02114-2621
Phone: (617) 726-8433
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 75 Francis St, Boston, MA 02115 — (617) 732-4222

Specialties & licences

Reproductive Endocrinology Physician (primary) Taxonomy 207VE0102X · Licence 55051 (MA)

Record details

NPI number1720038276
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 12, 2006
Last updated in NPPESJune 11, 2024
Certification dateJune 11, 2024

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolUNIVERSITY OF CINCINNATI COLLEGE OF MEDICINE
Graduated 1982 (44 years in practice)
Group practice Massachusetts General Physicians Organization Inc — 3484 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

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