Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John M Oestreicher, PHD
Psychologist in Appleton, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1619962024
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Registry record
Entity type Individual (Type 1)
Name John M Oestreicher
Credential PHD
Sex Male
Practice address 1531 S Madison St, Appleton, WI, 54915
Phone (920) 730-4411
Enumeration date Sep 13, 2005
Last updated in NPPES Sep 9, 2008
Taxonomy & licenses
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 39106700 | Medicaid | WI | - |
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
What is the NPI number for John Oestreicher?
The National Provider Identifier (NPI) for John Oestreicher is 1619962024, a Type 1 (individual) record in the CMS NPPES registry.
Where does John Oestreicher practice?
The practice location on file with NPPES is in Appleton, WI. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Thomas Hoeft Orthopaedic Surgery Physician · Appleton, WI NPI 1053314906 Paula Hubert Obstetrics & Gynecology Physician · Appleton, WI NPI 1487647087 Christopher Wagener Obstetrics & Gynecology Physician · Appleton, WI NPI 1063406064 David Sovine Psychiatry Physician · Appleton, WI NPI 1144214149 Deborah Scuglik Psychiatry Physician · Appleton, WI NPI 1962496984 Bernard Green Psychologist · Appleton, WI NPI 1508850595 Daniel Natali Psychologist · Appleton, WI NPI 1326032319 Martin Haanstad Psychologist · Appleton, WI NPI 1235123225
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-09.