Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen Rezabek, MMSC, RD, LDN

Registered Dietitian in Chicago, IL · enumerated 2007.

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

National Provider Identifier

1902015605

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Registry record

Entity type Individual (Type 1)

Name Karen Rezabek

Credential MMSC, RD, LDN

Sex Female

Practice address 1426 W Washington Blvd, Chicago, IL, 60607

Phone (312) 829-1424

Fax (312) 850-8431

Enumeration date May 21, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 420208 (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.

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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 Karen Rezabek?

Karen Rezabek 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 2007-07-08.