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

Christopher R Mackay

Individual provider Internal Medicine Physician · NPI 1427614163

Christopher R Mackay practises Internal Medicine in Boston, Massachusetts. Graduated from University of Massachusetts Medical School in 2019, 7 years ago. Practices with Brigham and Womens Physicians Organization Inc, a 2,916-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts and Rhode Island.

Years since qualifying
7
Trained at
University of Massachusetts Medical School
Licensed in
MA, RI
In the registry since
2019
Specialties on file
2

Practice location Address checks out

450 Brookline Ave
Boston, MA 02215-5450
Phone: (617) 632-3000
Show map & directions

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

Additional practice locations (1)

  • 75 Francis St, Boston, MA 02115-6106 — (617) 732-0055

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 292675 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence LP04518 (RI)

Record details

NPI number1427614163
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedMay 17, 2019
Last updated in NPPESJune 26, 2026
Certification dateJune 26, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL
Graduated 2019 (7 years in practice)
Group practice Brigham And Womens Physicians Organization Inc — 2916 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 patients136
Services billed 190 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Also affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at Brigham and Womens Physicians Organization Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2916 clinicians in the practice; 12 are shown here.

Other providers in Boston