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

John Oppenheimer, MD, PLLC

Organization Geriatric Medicine (Internal Medicine) Physician · NPI 1780956441

John Oppenheimer, MD, PLLC is a Geriatric Medicine (Internal Medicine) Physician in Sag Harbor, New York. Licensed in New York. Registered with an NPI since 2012.

Licensed in
NY
In the registry since
2012
What do these letters mean?
PLLC — Professional limited liability company
A form of business registration, not a clinical qualification.

See every abbreviation used in this directory →

Practice location Address checks out

60 Bay St
Sag Harbor, NY 11963-3106
Phone: (621) 725-4600
Show map & directions

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

Specialties & licences

Geriatric Medicine (Internal Medicine) Physician (primary) Taxonomy 207RG0300X · Licence 150853 (NY)

Record details

NPI number1780956441
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official John Oppenheimer — Physican · (631) 725-4600
NPI enumeratedJanuary 27, 2012
Last updated in NPPESJanuary 27, 2012
Mailing addressPo Box 3137, Sag Harbor, NY 11963-0405