Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John R Anslinger, OD
Optometrist in Watertown, WI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1780644245
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Registry record
Entity type Individual (Type 1)
Name John R Anslinger
Credential OD
Sex Male
Practice address 123 Hospital Dr, Ste 1002, Watertown, WI, 53098
Phone (920) 261-8225
Fax (920) 261-5343
Enumeration date Mar 27, 2006
Last updated in NPPES Aug 23, 2013
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 |
|---|---|---|---|
| 38509400 | 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
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.
What specialty is John Anslinger?
John Anslinger 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.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-23.