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

Melissa Mae Underdown

Registered Dietitian in Athens, PA · enumerated 2025.

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

National Provider Identifier

1821962069

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Registry record

Entity type Individual (Type 1)

Name Melissa Mae Underdown

Sex Female

Practice address Athens, PA, 18810

Phone (570) 404-3845

Enumeration date Oct 1, 2025

Last updated in NPPES Oct 1, 2025

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

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License DN007657 (PA) 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

Where does Melissa Underdown practice?

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

What is the NPI number for Melissa Underdown?

The National Provider Identifier (NPI) for Melissa Underdown is 1821962069, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-01.