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

Dr. Arthur J Siegel, MD

Individual provider Internal Medicine Physician · NPI 1881675601

Dr. Arthur J Siegel, MD is an Internal Medicine in Belmont, Massachusetts. Graduated from Harvard Medical School in 1967, 59 years ago. Practices with Massachusetts General Physicians Organization Inc, a 3,484-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
59
Trained at
Harvard 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.

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Practice location Address checks out

115 Mill St McLean Hospital
Belmont, MA 02478-9106
Phone: (617) 855-2358
Fax: (617) 855-3731
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 30958 (MA)

Record details

NPI number1881675601
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 9, 2005
Last updated in NPPESFebruary 11, 2014

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 1967 (59 years in practice)
Group practice Massachusetts General Physicians Organization Inc — 3484 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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