NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Charles E Clark, MD

Family Medicine Physician in Onalaska, WI · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1689713018

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Charles E Clark
Credential MD
Sex Male
Practice address 3111 Gundersen Dr, Onalaska, WI, 54650
Phone (608) 775-8100
Enumeration date Feb 5, 2007
Last updated in NPPES Feb 3, 2015

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 96180 (NM) Secondary
207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 51554 (WI) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
Q4886 Medicaid NM -

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Charles Clark?
The National Provider Identifier (NPI) for Charles Clark is 1689713018, a Type 1 (individual) record in the CMS NPPES registry.
Where does Charles Clark practice?
The practice location on file with NPPES is in Onalaska, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-02-03.