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

John Andrew McMahon, DO

Individual provider Sports Medicine (Internal Medicine) Physician · NPI 1821258062

John Andrew McMahon, DO is a Sports Medicine in Portsmouth, New Hampshire. Graduated from University of New England, College of Osteo Medicine in 2008, 18 years ago. Practices with Sportsmedicine Atlantic Orthopaedics PA, a 28-clinician group and accepts Medicare assignment. Licensed in Maine and New Hampshire.

Years since qualifying
18
Trained at
University of New England, College of Osteo Medicine
Licensed in
ME, NH
In the registry since
2008
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

1900 Lafayette Rd Ste A
Portsmouth, NH 03801-5679
Phone: (603) 431-1121
Fax: (603) 431-9147
Show map & directions

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

Specialties & licences

Sports Medicine (Internal Medicine) Physician (primary) Taxonomy 207RS0010X · Licence 16235 (NH)
Sports Medicine (Internal Medicine) Physician Taxonomy 207RS0010X · Licence 2237 (ME)

Record details

NPI number1821258062
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 11, 2008
Last updated in NPPESFebruary 23, 2017

Medicare enrollment

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

Medicare specialtySPORTS MEDICINE
Medical schoolUNIVERSITY OF NEW ENGLAND, COLLEGE OF OSTEO MEDICINE
Graduated 2008 (18 years in practice)
Group practice Sportsmedicine Atlantic Orthopaedics Pa — 28 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare