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

Seamus Mark, MD

Individual provider Family Medicine Physician · NPI 1538212477

Seamus Mark, MD is a Family Practice in Millis, Massachusetts. Graduated from Icahn School of Medicine at Mount Sinai in 2006, 20 years ago. Practices with Mass General Brigham Medical Group Suburban Massachusetts Inc, a 532-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
20
Trained at
Icahn School of Medicine at Mount Sinai
Licensed in
MA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

969 Main St Ste 205
Millis, MA 02054
Phone: (508) 376-3000
Fax: (508) 376-3024
Show map & directions

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

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 238902 (MA)

Record details

NPI number1538212477
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 22, 2007
Last updated in NPPESJune 18, 2024
Mailing address969 Main Street, Suite 205, Millis, MA 02054

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
Graduated 2006 (20 years in practice)
Group practice Mass General Brigham Medical Group Suburban Massachusetts Inc — 532 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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