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

Jaroslaw Jac, MD

Individual provider Internal Medicine Physician · NPI 1326029802

Jaroslaw Jac, MD is a Hematology/Oncology in Westborough, Massachusetts. Qualified in 1990, 36 years ago. Practices with Associated Physicians of Harvard Medical Faculty Physicians at Beth Is, a 558-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Massachusetts, Maine, New Hampshire and Texas.

Years since qualifying
36
Licensed in
MA, ME, NH, TX
In the registry since
2005
Specialties on file
6
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

150 Flanders Rd
Westborough, MA 01581-1017
Phone: (508) 870-2222
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 580 Court St, Keene, NH 03431-1718 — (603) 354-5400
  • 3073 White Mountain Hwy, North Conway, NH 03860-7101 — (603) 356-4904

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 238060 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 238060 (MA)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence 35312 (NH)
Internal Medicine Physician Taxonomy 207R00000X · Licence 35312 (NH)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence J9106 (TX)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence MD13980 (ME)

Record details

NPI number1326029802
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 10, 2005
Last updated in NPPESJuly 24, 2026
Certification dateJuly 24, 2026
Mailing address15 Hospital Dr, York, ME 03909-1011

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1990 (36 years in practice)
Group practice Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is — 558 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Westborough