Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marcia J Hartwig, PHD

Psychologist in Hattiesburg, MS · enumerated 2006.

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

National Provider Identifier

1124030788

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Registry record

Entity type Individual (Type 1)

Name Marcia J Hartwig

Credential PHD

Sex Female

Practice address 415 S 28th Ave, Hattiesburg, MS, 39401

Phone (601) 268-5620

Fax (601) 268-5720

Enumeration date Aug 12, 2006

Last updated in NPPES Jan 30, 2015

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 41-670 (MS) 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
640507572RU	Other	MS	AMERICAN ADMIN GROUP
00126033	Medicaid	MS	-
680015806	Other	-	RAILROAD MEDICARE

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 Marcia Hartwig?

Marcia Hartwig 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 2015-01-30.