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

Individual provider Internal Medicine Physician · NPI 1225028533

Dr. Leif William Ellisen, MDPHD is a Hematology/Oncology in Boston, Massachusetts. Graduated from Stanford University School of Medicine in 1992, 34 years ago. Practices with The General Hospital Corporation, a 1,276-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
34
Trained at
Stanford University School of Medicine
Licensed in
MA
In the registry since
2005
Specialties on file
2
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Practice location Address checks out

55 Fruit St Grj 904
Boston, MA 02114-2696
Phone: (617) 724-1399
Fax: (617) 726-8623
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 79659 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 79659 (MA)

Record details

NPI number1225028533
Entity typeIndividual (Type 1)
GenderMale
Credentials MDPHD
Sole proprietorNo
NPI enumeratedOctober 27, 2005
Last updated in NPPESOctober 22, 2012

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolSTANFORD UNIVERSITY SCHOOL OF MEDICINE
Graduated 1992 (34 years in practice)
Group practice The General Hospital Corporation — 1276 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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