Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Lynn Mary Stock, PHD

Psychologist in Fond Du Lac, WI · enumerated 2009.

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

National Provider Identifier

1346481470

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Registry record

Entity type Individual (Type 1)

Name Dr. Lynn Mary Stock

Credential PHD

Sex Female

Practice address 430 E Division St, Fond Du Lac, WI, 54935

Phone (920) 926-4200

Enumeration date Mar 19, 2009

Last updated in NPPES Oct 20, 2020

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 3669-125 (WI) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 2777-57 (WI) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
100002879	Medicaid	WI	-

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 Lynn Stock?

Lynn Stock 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 2020-10-20.