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

Mario Jose Castellanos, MD

Individual provider Emergency Medicine Physician · NPI 1164050910

Mario Jose Castellanos, MD is an Emergency Medicine in Boston, Massachusetts. Graduated from Medical College of Wisconsin in 2021, 5 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.

Years since qualifying
5
Trained at
Medical College of Wisconsin
Licensed in
MA
In the registry since
2020
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

75 Francis St
Boston, MA 02115-6110
Phone: (617) 732-5500
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Additional practice locations (1)

  • 55 Fruit St, Boston, MA 02114-2621 — (617) 726-2000

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 289097 (MA)

Record details

NPI number1164050910
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 28, 2020
Last updated in NPPESJune 23, 2025
Certification dateJune 23, 2025

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2021 (5 years in practice)
Group practice Brigham And Womens Physicians Organization Inc — 2916 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Boston