NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Mark Lowenheim, MD Pllc

Pediatric Gastroenterology Physician in Port Jefferson Station, NY · enumerated 2010 · authorized official Mark Lowenheim, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1801106125

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Mark Lowenheim, MD Pllc
Other name <Unavail>
Practice address 1174 Route 112, Port Jefferson Station, NY, 11776
Phone (631) 403-4507
Fax (631) 642-2475
Enumeration date Oct 20, 2010
Last updated in NPPES Oct 20, 2010

Taxonomy & classification

2080P0206X Pediatric Gastroenterology Physician Allopathic & Osteopathic Physicians · License 170700 (NY) Primary

Authorized official

Name Mark Lowenheim
Title Owner
Phone (631) 403-4507

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2010-10-20. Verify at npiregistry.cms.hhs.gov.
Where is Mark Lowenheim, MD Pllc located?
The practice location on file with NPPES is in Port Jefferson Station, NY.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-10-20.