Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Robert J. Mertz, O.D.
Optometrist in Fitchburg, WI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1174693246
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Registry record
Entity type Individual (Type 1)
Name Robert J. Mertz
Credential O.D.
Sex Male
Practice address 3051 Cahill Main, Fitchburg, WI, 53711
Phone (608) 661-7200
Enumeration date Nov 8, 2006
Last updated in NPPES Oct 17, 2012
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 |
|---|---|---|---|
| 38530200 | 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 Robert Mertz?
The National Provider Identifier (NPI) for Robert Mertz is 1174693246, a Type 1 (individual) record in the CMS NPPES registry.
Where does Robert Mertz practice?
The practice location on file with NPPES is in Fitchburg, WI. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Mark Huth Family Medicine Physician · Fitchburg, WI NPI 1013998715 Christine Tock Dermatology Physician · Fitchburg, WI NPI 1811968571 Pichaya Ratarasarn Dermatology Physician · Fitchburg, WI NPI 1225095466 Eric Hilquist Family Medicine Physician · Fitchburg, WI NPI 1841242021 Alison Ruppel Registered Dietitian · Fitchburg, WI NPI 1164457313 Ann Patkowski Optometrist · Fitchburg, WI NPI 1063437036 Teresa Skolaski-Pellitteri Occupational Therapist · Fitchburg, WI NPI 1669497418 John Strezlec Clinical Social Worker · Fitchburg, WI NPI 1265457873
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-10-17.