Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Margaret Stienstra
Psychologist in Harwich Port, MA · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1891117461
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Registry record
Entity type Individual (Type 1)
Name Margaret Stienstra
Sex Female
Practice address 466 Main St, Child & Family Services, Harwich Port, MA, 02646
Phone (508) 576-9444
Enumeration date Jan 15, 2014
Last updated in NPPES Jan 15, 2014
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
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.
What specialty is Margaret Stienstra?
Margaret Stienstra is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-15.