Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Diane M Oppeneer, APNP

Nurse Practitioner in Manitowoc, WI · enumerated 2005.

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

National Provider Identifier

1831174143

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Registry record

Entity type Individual (Type 1)

Name Mrs. Diane M Oppeneer

Credential APNP

Sex Female

Practice address 1650 S 41st St, Manitowoc, WI, 54220

Phone (920) 476-6200

Enumeration date Dec 8, 2005

Last updated in NPPES Oct 9, 2025

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 2302-033 (WI) Primary

Other identifiers

Identifier	Type	State	Issuer
411763000	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.

Read the full guide → Validate an NPI →

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 Diane Oppeneer?

Diane Oppeneer is registered in NPPES with the primary taxonomy of Nurse Practitioner. 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 2025-10-09.