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

Dr. Barbara Gerth Markway, PH.D.

Psychologist in Jefferson City, MO · enumerated 2006.

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

National Provider Identifier

1558456921

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Registry record

Entity type Individual (Type 1)

Name Dr. Barbara Gerth Markway

Credential PH.D.

Sex Female

Practice address Jefferson City, MO, 65101

Phone (573) 635-5055

Fax (573) 635-5014

Enumeration date Oct 3, 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

103T00000X Psychologist Behavioral Health & Social Service Providers · License PY01500 (MO) 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 Barbara Markway practice?

The practice location on file with NPPES is in Jefferson City, MO. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Barbara Markway?

The National Provider Identifier (NPI) for Barbara Markway is 1558456921, a Type 1 (individual) record in the CMS NPPES registry.

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