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

Ms. Mary Ann Karstens, PHD

Professional Counselor in Orland Park, IL · enumerated 2008.

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

National Provider Identifier

1154508885

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Registry record

Entity type Individual (Type 1)

Name Ms. Mary Ann Karstens

Credential PHD

Sex Female

Practice address Orland Park, IL, 60462

Phone (708) 349-4455

Fax (708) 349-6448

Enumeration date Jan 24, 2008

Last updated in NPPES Mar 26, 2009

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

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 149005827 (IL) Primary

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

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Mary Karstens practice?

The practice location on file with NPPES is in Orland Park, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mary Karstens?

The National Provider Identifier (NPI) for Mary Karstens is 1154508885, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Nikunj Vaishnav Pediatrics Physician · Orland Park, IL NPI 1780613877 Family Counseling Solutions Clinical Social Worker · Orland Park, IL NPI 1235205295 Christine Kalowski Clinical Social Worker · Orland Park, IL NPI 1447370424 Psychology Services, Incorporated Professional Counselor · Orland Park, IL NPI 1831211580 Dennis J Niswonger, Psy.D, S.C Clinical Psychologist · Orland Park, IL NPI 1760656581

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-03-26.