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

Peggy Williamson, PLPC

Mental Health Counselor in Saint Louis, MO · enumerated 2016.

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

National Provider Identifier

1639613888

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Registry record

Entity type Individual (Type 1)

Name Peggy Williamson

Credential PLPC

Sex Female

Practice address Saint Louis, MO, 63121

Phone (314) 261-6011

Enumeration date Dec 7, 2016

Last updated in NPPES Apr 25, 2017

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

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 2016035428 (MO) Primary

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

What is the NPI number for Peggy Williamson?

The National Provider Identifier (NPI) for Peggy Williamson is 1639613888, a Type 1 (individual) record in the CMS NPPES registry.

Where does Peggy Williamson practice?

The practice location on file with NPPES is in Saint Louis, MO. 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 2017-04-25.