Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John S Purdue, OD
Optometrist in Onalaska, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1467456830
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Registry record
Entity type Individual (Type 1)
Name John S Purdue
Credential OD
Sex Male
Practice address 3111 Gundersen Drive, Onalaska, WI, 54650
Phone (608) 796-8630
Enumeration date Jun 13, 2005
Last updated in NPPES Apr 24, 2015
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 38517500 | 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 specialty is John Purdue?
John Purdue is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Sarah Naik Internal Medicine Physician · Onalaska, WI NPI 1891797106 Rajiv Naik Pediatrics Physician · Onalaska, WI NPI 1902808215 Shannan Stephens Obstetrics & Gynecology Physician · Onalaska, WI NPI 1295739084 Chad Thurman Family Medicine Physician · Onalaska, WI NPI 1801890660 Stephen Maden Physical Therapist · Onalaska, WI NPI 1174527790 Ellen Ott Pediatric Nurse Practitioner · Onalaska, WI NPI 1710981154 Jonathan Straker Physical Therapist · Onalaska, WI NPI 1144225517 James Tomlin Medical Physician Assistant · Onalaska, WI NPI 1376548768
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-04-24.