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

Cal W Harmon, DMD

General Practice Dentistry in Collinsville, IL · enumerated 2016.

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

National Provider Identifier

1043662042

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Registry record

Entity type Individual (Type 1)
Name Cal W Harmon
Credential DMD
Sex Male
Practice address Collinsville, IL, 62234
Phone (618) 346-2006
Enumeration date Jul 1, 2016
Last updated in NPPES Jul 1, 2016

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

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 019030731 (IL) Primary
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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

What is the NPI number for Cal Harmon?
The National Provider Identifier (NPI) for Cal Harmon is 1043662042, a Type 1 (individual) record in the CMS NPPES registry.
Where does Cal Harmon practice?
The practice location on file with NPPES is in Collinsville, IL. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-07-01.