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

Dr. John Alexander Duffy, MD

Individual provider Sports Medicine (Internal Medicine) Physician · NPI 1861997025

Dr. John Alexander Duffy, MD is an Internal Medicine in Philadelphia, Pennsylvania. Graduated from New York Medical College in 2018, 8 years ago. Practices with Fairview Health Services, a 678-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
8
Trained at
New York Medical College
Licensed in
PA
In the registry since
2018
Specialties on file
2
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

3401 Civic Center Blvd
Philadelphia, PA 19104-4319
Phone: (215) 590-1527
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatric Sports Medicine Physician (primary) Taxonomy 2080S0010X · Licence MT235940 (PA)
Sports Medicine (Internal Medicine) Physician Taxonomy 207RS0010X · Licence MT235940 (PA)

Record details

NPI number1861997025
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 28, 2018
Last updated in NPPESJuly 5, 2026
Certification dateJuly 5, 2026
Mailing address3401 Civic Center Blvd, Philadelphia, PA 19104-4319

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 2018 (8 years in practice)
Group practice Fairview Health Services — 678 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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