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

Individual provider Medical Toxicology (Emergency Medicine) Physician · NPI 1801820659

Derek A Barclay, MD is a Medical Toxicology (Emergency Medicine) Physician in Boston, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2006.

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 Partly verified

Some contact details are missing from the federal record.

Brigham And Women's Hospital 75 Francis Street Neville House
Boston, MA 02115 Not confirmed with CMS for 19 years — call before visiting
Phone: (617) 732-5656
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Toxicology (Emergency Medicine) Physician (primary) Taxonomy 207PT0002X · Licence 226628 (MA)

Record details

NPI number1801820659
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 10, 2006
Last updated in NPPESJuly 8, 2007

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 patients390
Services billed 417 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

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