Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Madeline Lucy Williamson, MS

Genetic Counselor (M.S.) in Danville, PA · enumerated 2019.

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

National Provider Identifier

1659938546

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Registry record

Entity type Individual (Type 1)

Name Madeline Lucy Williamson

Credential MS

Sex Female

Practice address 100 N Academy Ave # Mc26-20, Danville, PA, 17822

Phone (570) 214-2637

Fax (570) 214-7342

Enumeration date May 25, 2019

Last updated in NPPES Jan 12, 2021

Taxonomy & licenses

170300000X Genetic Counselor (M.S.) Other Service Providers 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 Madeline Williamson?

The National Provider Identifier (NPI) for Madeline Williamson is 1659938546, a Type 1 (individual) record in the CMS NPPES registry.

Where does Madeline Williamson practice?

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

Other providers at this practice address

Browse all →

Sara Reed Genetic Counselor (M.S.) · Danville, PA NPI 1669900957 Nicole Ortiz Genetic Counselor (M.S.) · Danville, PA NPI 1801455944

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-12.