NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Joan Florence Marks, MS

Clinical Social Worker in Bangor, ME · enumerated 2006.

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

National Provider Identifier

1366466096

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Registry record

Entity type Individual (Type 1)
Name Joan Florence Marks
Credential MS
Sex Female
Practice address Bangor, ME, 04401
Phone (207) 942-9200
Enumeration date Jul 26, 2006
Last updated in NPPES Jul 8, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LC443 (ME) Primary
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 27469 (TX) Secondary

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 is the NPI number for Joan Marks?
The National Provider Identifier (NPI) for Joan Marks is 1366466096, a Type 1 (individual) record in the CMS NPPES registry.
Where does Joan Marks practice?
The practice location on file with NPPES is in Bangor, ME. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.