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

Mark Lowenheim, MD PLLC

Organization Pediatric Gastroenterology Physician · NPI 1801106125

Mark Lowenheim, MD PLLC is a Pediatric Gastroenterology Physician in Port Jefferson Station, New York. Licensed in New York. Registered with an NPI since 2010.

Licensed in
NY
In the registry since
2010
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

1174 Route 112
Port Jefferson Station, NY 11776-8033
Phone: (631) 403-4507
Fax: (631) 642-2475
Show map & directions

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

Specialties & licences

Pediatric Gastroenterology Physician (primary) Taxonomy 2080P0206X · Licence 170700 (NY)

Record details

NPI number1801106125
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Lowenheim — Owner · (631) 403-4507
Other names Long Island Pediatric Gastroenterology
NPI enumeratedOctober 20, 2010
Last updated in NPPESOctober 20, 2010
Mailing address1174 Route 112, Port Jefferson Station, NY 11776-8033