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

William Demarco, DO

Individual provider Internal Medicine Physician · NPI 1124103577

William Demarco, DO is an Internal Medicine in Great Barrington, Massachusetts. Graduated from University of New England, College of Osteo Medicine in 1984, 42 years ago. Practices with Berkshire Medical Center Inc, a 196-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
42
Trained at
University of New England, College of Osteo Medicine
Licensed in
MA
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

29 Lewis Ave
Great Barrington, MA 01230
Phone: (413) 496-6820
Fax: (413) 496-6821
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 59492 (MA)

Record details

NPI number1124103577
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedOctober 26, 2006
Last updated in NPPESJanuary 24, 2008
Mailing address725 North Street, Pittsfield, MA 01201

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF NEW ENGLAND, COLLEGE OF OSTEO MEDICINE
Graduated 1984 (42 years in practice)
Group practice Berkshire Medical Center Inc — 196 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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