Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. David Marks, PSY.D.

Psychologist in Martinsburg, WV · enumerated 2014.

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

National Provider Identifier

1588076566

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Registry record

Entity type Individual (Type 1)

Name Dr. David Marks

Credential PSY.D.

Sex Male

Practice address 510 Butler Ave, Martinsburg, WV, 25405

Phone (304) 263-0811

Enumeration date May 27, 2014

Last updated in NPPES Sep 29, 2020

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 0810005836 (VA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is David Marks?

David Marks 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.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-29.