Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Russell Carl Marks

School Counselor in Concord, CA · enumerated 2007.

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

National Provider Identifier

1306971122

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Registry record

Entity type Individual (Type 1)

Name Russell Carl Marks

Sex Male

Practice address 1034 Oak Grove Rd, Concord, CA, 94518

Phone (925) 603-1900

Enumeration date Feb 22, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

101YS0200X School Counselor Behavioral Health & Social Service Providers Primary

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

What specialty is Russell Marks?

Russell Marks is registered in NPPES with the primary taxonomy of School Counselor. 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 2007-07-08.