Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Tamara Jill Marder, PH.D.

Behavior Analyst in Vienna, VA · enumerated 2010.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1104128131

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Registry record

Entity type Individual (Type 1)

Name Dr. Tamara Jill Marder

Credential PH.D.

Sex Female

Practice address 1604 Spring Hill Rd, 3rd Fl, Suite 310, Vienna, VA, 22182

Phone (703) 585-1095

Enumeration date Nov 24, 2010

Last updated in NPPES Nov 24, 2010

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 1-07-3304 Primary

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY1000529 (DC) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 04031 (MD) Secondary

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.

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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 Tamara Marder?

Tamara Marder is registered in NPPES with the primary taxonomy of Behavior Analyst. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-24.