Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Margaret Marshall, PH.D.
Psychologist in Philadelphia, PA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1639213283
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Registry record
Entity type Individual (Type 1)
Name Margaret Marshall
Credential PH.D.
Sex Female
Practice address 227 N 18th St, Philadelphia, PA, 19103
Phone (215) 854-7038
Enumeration date Feb 16, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PS006429L (PA) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD 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 1639213283 active?
Yes, as of the latest NPPES snapshot, NPI 1639213283 is active (record last updated 2007-07-08).
How do I verify Margaret Marshall's NPI record?
Cross-check NPI 1639213283 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.