Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Claes M Nilsson, MD

Individual provider Internal Medicine Physician · NPI 1912006065

Claes M Nilsson, MD practises Internal Medicine in Dedham, Massachusetts. Graduated from Yale University School of Medicine in 1973, 53 years ago. Practices with Vantage Healthcare LLC, a 69-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
53
Trained at
Yale University School of Medicine
Licensed in
MA
In the registry since
2006
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

990 Washington St Ste 203
Dedham, MA 02026-6714
Phone: (413) 543-6820
Fax: (781) 326-1384
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 53091 (MA)

Record details

NPI number1912006065
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 22, 2006
Last updated in NPPESOctober 19, 2022
Certification dateOctober 18, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHEMATOLOGY/ONCOLOGY
Medical schoolYALE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1973 (53 years in practice)
Group practice Vantage Healthcare Llc — 69 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients422
Services billed 853 a service is one billed item, such as a visit, a test or a procedure
Average patient age79

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Sherrill House Nursing home · Boston, MA · listed as Sherrill House, Inc
  • Caretenders Home health agency · Needham Heights, MA
  • Good Shepherd Community Care Hospice · Newton, MA

Colleagues at Vantage Healthcare LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 69 clinicians in the practice; 12 are shown here.

Other providers in Dedham