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

Gregory B. Cook, DC

Chiropractor in Lake in the Hills, IL · enumerated 2006.

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

National Provider Identifier

1689628562

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Registry record

Entity type Individual (Type 1)
Name Gregory B. Cook
Credential DC
Sex Male
Practice address Lake in the Hills, IL, 60156
Phone (815) 356-6200
Fax (224) 509-8068
Enumeration date May 22, 2006
Last updated in NPPES Oct 14, 2016

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 038008183 (IL) Primary
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC 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

How do I verify Gregory Cook's NPI record?
Cross-check NPI 1689628562 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1689628562 active?
Yes, as of the latest NPPES snapshot, NPI 1689628562 is active (record last updated 2016-10-14).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-14.