Joseph Marik MD
About this NPIWhat this record shows.
NPI 1710969860 is registered to Joseph Marik MD, a Internal Medicine practising at 420 E Division St in Fond Du Lac, Wisconsin. Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties. Joseph Marik MD has been enumerated in the National Provider Identifier (NPI) registry since 2005.
Your brand here.
Secondary identifiers
Additional identifiers this provider has registered with NPPES. Used by medical billers, credentialers, and insurance verifiers to cross-reference claims and enrollments.
Medicaid
- 31794700WI
Other
- 110166106WI· Issued by RAILROAD MEDICARE
Source: NPPES public registry.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Joseph Marik MD accepts. To confirm in-network status with your specific health plan, contact Joseph Marik MD directly at (920) 926-8420.
Frequently asked
Yes. NPI 1710969860 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (920) 926-8420.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Joseph Marik MD is a Type-1 individual NPI.