Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Jon M Williamson, OD
Optometrist in Sparta, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1932104114
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Registry record
Entity type Individual (Type 1)
Name Jon M Williamson
Credential OD
Sex Male
Practice address 1111 W Wisconsin St, Sparta, WI, 54656
Phone (608) 269-6731
Enumeration date Jun 15, 2005
Last updated in NPPES Jul 21, 2022
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 |
|---|---|---|---|
| 38584300 | 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 Jon Williamson?
The National Provider Identifier (NPI) for Jon Williamson is 1932104114, a Type 1 (individual) record in the CMS NPPES registry.
Where does Jon Williamson practice?
The practice location on file with NPPES is in Sparta, WI. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Kelly Seib Geriatric Medicine (Internal Medicine) Physician · Sparta, WI NPI 1831157114 Gundersen Clinic, Ltd. Optometrist · Sparta, WI NPI 1578518346 Gundersen Clinic, Ltd. Mental Health Clinic/Center (Including Community Mental Health Center) · Sparta, WI NPI 1235171836 Donna Kettner Clinical Social Worker · Sparta, WI NPI 1619158151 Erin Hardy Clinical Social Worker · Sparta, WI NPI 1922259811 Candace Hundt Physical Therapist · Sparta, WI NPI 1912228859 Krysta Bever Physical Therapist · Sparta, WI NPI 1326395195 Amanda Kalisz Clinical Social Worker · Sparta, WI NPI 1831595859
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.