Marie A. Hollenhorst, MD, PHD
Hematology (Internal Medicine) Physician · Boston, MA
Marie A. Hollenhorst, MD, PHD is a hematology (internal medicine) physician with a practice address in Boston, Massachusetts, and NPI 1497193999, issued on Jun 6, 2013. Check the license (Massachusetts 262787, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Marie A. Hollenhorst
- Credential
- MD, PHD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- 262787 MA
Self-reported in NPPES; status is on the state search - Practice location
- 75 Francis St, Boston, MA 02115
- Phone
- (617) 732-5500
- Enumerated
- Jun 6, 2013
- Record last updated
- Feb 11, 2026
- Medicare enrollment
- Enrolled (PECOS I20221222001360); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology (internal medicine) physician records → All 117 in Massachusetts → Look up another NPI →
Also registered at 75 Francis St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sarah Abbett, M.D.Anesthesiology Physician1902097736
- Christine Abbott, NPAdult Health Nurse Practitioner1851471940
- Muhammad Abd-El-Barr, M.D., PH.D.Neurological Surgery Physician1891922688
- Duaa AbdelhameidStudent in an Organized Health Care Education/Training Program1851852867
Verify Marie A. Hollenhorst in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 262787Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
12 Medicare Part D claims, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Brigham And Womens Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marie A. Hollenhorst among 117 hematology (internal medicine) physician records in Massachusetts
Marie A. Hollenhorst, MD, PHD is one of 117 hematology (internal medicine) physician records with a practice address in Massachusetts. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 68% of them.
- NPI issued2013 · 68% of these records are older, 31% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2013 · median 2006 among the 77 with a school on file
- Record last updated2026 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology (Internal Medicine) Physician providers in Massachusetts
There are 117 hematology (internal medicine) physician records in Massachusetts.
All 117 in Massachusetts → Every provider in Boston → Hematology (Internal Medicine) Physician nationwide →
The 8 hematology (internal medicine) physician records with the nearest ZIP codes
- Elisabeth Battinelli, M.D.Boston, MA 021151356492011
- Edward Benz, MDBoston, MA 021151629069075
- Barbara Bierer, MDBoston, MA 021151285642298
- Jennifer Brown, MD PHDBoston, MA 021151457328163
- Nathan Connell, MD, MPHBoston, MA 021151245432467
- Jean Connors, MDBoston, MA 021151902915275
- James Cunningham, MDBoston, MA 021151225126352
- Corey Cutler, M.D.Boston, MA 021151699736686
Common questions
What is Marie A. Hollenhorst, MD, PHD's NPI number?
Marie A. Hollenhorst, MD, PHD's National Provider Identifier (NPI) is 1497193999, issued on Jun 6, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Marie A. Hollenhorst, MD, PHD located?
The NPPES record lists a practice address at 75 Francis St, Boston, MA, 02115. Phone: (617) 732-5500. Providers update this record themselves, so call before visiting.
How can I verify Marie A. Hollenhorst, MD, PHD's license?
NPPES lists Massachusetts license number 262787, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marie A. Hollenhorst, MD, PHD prescribe under Medicare Part D?
In 2024, Marie A. Hollenhorst, MD, PHD had 12 Medicare Part D claims; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.