Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Joseph Masefield, PT DPT
Physical Therapist in Riverhead, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1013003680
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Registry record
Entity type Individual (Type 1)
Name Dr. Joseph Masefield
Credential PT DPT
Sex Male
Practice address 185 Old Country Dr Suite 4, Maximum Performance Physical Therapy, Riverhead, NY, 11901
Phone (631) 208-4443
Fax (631) 208-4448
Enumeration date Oct 4, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 0059492 (NY) Primary
225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License RPT1698 (ID) Secondary
225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 5386 (NJ) Secondary
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 Joseph Masefield?
Joseph Masefield is registered in NPPES with the primary taxonomy of Physical Therapist. 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.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.