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

James Allan Karlson, MD

Individual provider Sports Medicine (Orthopaedic Surgery) Physician · NPI 1114915261

James Allan Karlson, MD is an Orthopedic Surgery in Cambridge, Massachusetts. Graduated from Warren Alpert Medical School of Brown University in 1988, 38 years ago. Practices with President and Fellows of Harvard College, a 95-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
38
Trained at
Warren Alpert Medical School of Brown University
Licensed in
MA
In the registry since
2005
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

300 Mount Auburn St Ste 505
Cambridge, MA 02138-5600
Phone: (617) 491-6766
Fax: (617) 491-2552
Show map & directions

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

Additional practice locations (1)

  • 20 Guest St Ste 225, Brighton, MA 02135-2065 — (617) 738-8642

Specialties & licences

Sports Medicine (Orthopaedic Surgery) Physician (primary) Taxonomy 207XX0005X · Licence 74009 (MA)

Record details

NPI number1114915261
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 12, 2005
Last updated in NPPESAugust 7, 2019
Mailing address20 Guest St Ste 225, Brighton, MA 02135-2065

Medicare enrollment

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

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolWARREN ALPERT MEDICAL SCHOOL OF BROWN UNIVERSITY
Graduated 1988 (38 years in practice)
Group practice President And Fellows Of Harvard College — 95 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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