Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John Defrance, M.D.
Surgery Physician in Danbury, CT · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679515381
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Registry record
Entity type Individual (Type 1)
Name John Defrance
Credential M.D.
Sex Male
Practice address 27 Hospital Ave, Danbury, CT, 06810
Phone (203) 797-1811
Enumeration date Jun 10, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD 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.
Frequently asked questions
Where does John Defrance practice?
The practice location on file with NPPES is in Danbury, CT. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Defrance?
The National Provider Identifier (NPI) for John Defrance is 1679515381, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.