Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Liesel Amanda Joy Maddox, RDN

Registered Dietitian in Boulder, CO · enumerated 2020.

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

National Provider Identifier

1225646839

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Registry record

Entity type Individual (Type 1)

Name Liesel Amanda Joy Maddox

Credential RDN

Sex Female

Practice address 1942 Broadway Ste 314c, Boulder, CO, 80302

Phone (719) 445-9573

Enumeration date Jul 20, 2020

Last updated in NPPES Mar 7, 2024

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 86151077 (TX) 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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Liesel Maddox?

Liesel Maddox is registered in NPPES with the primary taxonomy of Registered Dietitian. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-07.