Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Spencer Alan Ladner
Peer Specialist in Oxnard, CA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659154946
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Registry record
Entity type Individual (Type 1)
Name Spencer Alan Ladner
Sex Male
Practice address 1911 Williams Dr, Oxnard, CA, 93036
Phone (805) 981-6830
Enumeration date Aug 18, 2023
Last updated in NPPES Jul 12, 2024
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
How do I verify Spencer Ladner's NPI record?
Cross-check NPI 1659154946 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1659154946 active?
Yes, as of the latest NPPES snapshot, NPI 1659154946 is active (record last updated 2024-07-12).
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-12.