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

Marie A Hollenhorst, MD, PHD

Individual provider Internal Medicine Physician · NPI 1497193999

Marie A Hollenhorst, MD, PHD is a Hematology in Boston, Massachusetts. Graduated from Harvard Medical School in 2013, 13 years ago. Practices with Brigham and Womens Physicians Organization Inc, a 2,916-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
13
Trained at
Harvard Medical School
Licensed in
MA
In the registry since
2013
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

75 Francis St
Boston, MA 02115-6110
Phone: (617) 732-5500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 55 Fruit St, Boston, MA 02114-2621 — (617) 732-5190

Specialties & licences

Hematology (Internal Medicine) Physician (primary) Taxonomy 207RH0000X · Licence 262787 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 262787 (MA)

Record details

NPI number1497193999
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedJune 6, 2013
Last updated in NPPESFebruary 11, 2026
Certification dateFebruary 11, 2026

Medicare enrollment

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

Medicare specialtyHEMATOLOGY
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 2013 (13 years in practice)
Group practice Brigham And Womens Physicians Organization Inc — 2916 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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