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

Karen Faith Willner, RD

Registered Dietitian in Royal Oak, MI · enumerated 2010 · practices at Inner Door Center, LLC.

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

National Provider Identifier

1447573662

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Registry record

Entity type Individual (Type 1)

Name Karen Faith Willner

Credential RD

Sex Female

Practice address Royal Oak, MI, 48067

Phone (248) 336-2868

Fax (248) 336-2879

Enumeration date Mar 2, 2010

Last updated in NPPES Mar 2, 2010

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 4731 (OH) 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

What specialty is Karen Willner?

Karen Willner 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.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-03-02.