Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joan Helene Radeke Dannacher, MA, CCC-SLP, RD/LDN

Registered Dietitian in Clarendon Hills, IL · enumerated 2007.

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

National Provider Identifier

1558559591

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Registry record

Entity type Individual (Type 1)

Name Joan Helene Radeke Dannacher

Credential MA, CCC-SLP, RD/LDN

Sex Female

Practice address 106 Ann St, Clarendon Hills, IL, 60514

Phone (630) 926-8307

Fax (630) 789-2870

Enumeration date Oct 3, 2007

Last updated in NPPES Nov 17, 2008

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 146003788 (IL) Secondary

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 164004948 (IL) Primary

RD · Registered Dietitian: A nutrition professional credentialed by the Commission on Dietetic Registration. About the RD 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 Joan Radeke Dannacher practice?

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

What is the NPI number for Joan Radeke Dannacher?

The National Provider Identifier (NPI) for Joan Radeke Dannacher is 1558559591, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-11-17.