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

Dennis S O'Brien, MD

Individual provider Internal Medicine Physician · NPI 1952449829

Dennis S O'Brien, MD is an Internal Medicine Physician in Ticonderoga, New York. Licensed in New York. Registered with an NPI since 2007.

Licensed in
NY
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

102 Race Track Rd Ste 1
Ticonderoga, NY 12883-4004
Phone: (518) 585-6708
Fax: (518) 585-3260
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 154766 (NY)

Record details

NPI number1952449829
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 2, 2007
Last updated in NPPESNovember 9, 2018