Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John Martin, PH.D.
Psychologist in Naperville, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1417921271
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Registry record
Entity type Individual (Type 1)
Name Dr. John Martin
Credential PH.D.
Sex Male
Practice address 29 S Webster St, Suite 220, Naperville, IL, 60540
Phone (630) 355-9933
Enumeration date Feb 16, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD 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
Is NPI 1417921271 active?
Yes, as of the latest NPPES snapshot, NPI 1417921271 is active (record last updated 2007-07-08).
How do I verify John Martin's NPI record?
Cross-check NPI 1417921271 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
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.