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

Dr. Mary Ann Koenig, PSY.D.

Clinical Psychologist in Exton, PA · enumerated 2007.

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

National Provider Identifier

1598971525

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Registry record

Entity type Individual (Type 1)
Name Dr. Mary Ann Koenig
Credential PSY.D.
Sex Female
Practice address Exton, PA, 19341
Phone (610) 524-9060
Fax (610) 524-1211
Enumeration date May 15, 2007
Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PS-006930-L (PA) 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.

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Frequently asked questions

Where does Mary Ann Koenig practice?
The practice location on file with NPPES is in Exton, PA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mary Ann Koenig?
The National Provider Identifier (NPI) for Mary Ann Koenig is 1598971525, a Type 1 (individual) record in the CMS NPPES registry.

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