Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Sandra Mattar, PSYD
Clinical Psychologist in Boston, MA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1558843631
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Registry record
Entity type Individual (Type 1)
Name Dr. Sandra Mattar
Credential PSYD
Sex Female
Practice address Boston Medical Center, 1 Boston Medical Center Place, Boston, MA, 02118
Phone (617) 414-5245
Fax (617) 414-5520
Enumeration date Sep 5, 2018
Last updated in NPPES Oct 23, 2018
Taxonomy & licenses
103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 10362 (MA) Primary
PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice.
About the PSYD credential
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 NPI 1558843631 active?
Yes, as of the latest NPPES snapshot, NPI 1558843631 is active (record last updated 2018-10-23).
How do I verify Sandra Mattar's NPI record?
Cross-check NPI 1558843631 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-10-23.