Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Fallon Kathleen Martensen
Specialist in East Islip, NY · enumerated 2024.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1003647884
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Registry record
Entity type Individual (Type 1)
Name Fallon Kathleen Martensen
Sex Female
Practice address 35 the Moor, East Islip, NY, 11730
Phone (631) 704-0930
Enumeration date Aug 12, 2024
Last updated in NPPES Aug 12, 2024
Taxonomy & licenses
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.
Frequently asked questions
What specialty is Fallon Martensen?
Fallon Martensen is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-12.