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

Dr. Gregg Hal Kalbfleisch, DDS

Oral and Maxillofacial Surgery (Dentist) in Longmont, CO · enumerated 2007 · practices at Wayne W Castle DDS PC.

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

National Provider Identifier

1639221336

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregg Hal Kalbfleisch

Credential DDS

Sex Male

Practice address Longmont, CO, 80501

Phone (303) 772-8585

Fax (303) 776-4895

Enumeration date Jan 16, 2007

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

1223S0112X Oral and Maxillofacial Surgery (Dentist) Dental Providers · License H-D-1-00226 (CO) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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 Gregg Kalbfleisch?

The National Provider Identifier (NPI) for Gregg Kalbfleisch is 1639221336, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregg Kalbfleisch practice?

The practice location on file with NPPES is in Longmont, CO. 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 2007-07-08.