Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Karen Melissa Klimczak, R.D., L.D.N.

Registered Dietitian in Chicago, IL · enumerated 2006.

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

National Provider Identifier

1770594673

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Registry record

Entity type Individual (Type 1)

Name Mrs. Karen Melissa Klimczak

Credential R.D., L.D.N.

Sex Female

Practice address 5061 N Pulaski Rd, Suite 300, Chicago, IL, 60630

Phone (773) 539-8181

Fax (773) 539-0039

Enumeration date Aug 10, 2006

Last updated in NPPES Mar 25, 2013

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 164.004727 (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

Is NPI 1770594673 active?

Yes, as of the latest NPPES snapshot, NPI 1770594673 is active (record last updated 2013-03-25).

How do I verify Karen Klimczak's NPI record?

Cross-check NPI 1770594673 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-25.