Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John Castelli Jr.
Specialist in San Francisco, CA · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598187585
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Registry record
Entity type Individual (Type 1)
Name John Castelli Jr.
Sex Male
Practice address 1390 Market St Ste 201, San Francisco, CA, 94102
Phone (415) 252-3975
Enumeration date Jan 10, 2014
Last updated in NPPES Jan 10, 2014
Taxonomy & licenses
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 Castelli practice?
The practice location on file with NPPES is in San Francisco, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Castelli?
The National Provider Identifier (NPI) for John Castelli is 1598187585, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-10.