Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Frank M. Wittmaack, M.D.

Reproductive Endocrinology Physician in Green Bay, WI · enumerated 2006.

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

National Provider Identifier

1366494676

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Registry record

Entity type Individual (Type 1)

Name Dr. Frank M. Wittmaack

Credential M.D.

Sex Male

Practice address 2845 Greenbrier Rd, Green Bay, WI, 54311

Phone (920) 288-8500

Enumeration date May 16, 2006

Last updated in NPPES Aug 19, 2024

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License MD046113L (PA) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 30771 (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
34715600	Medicaid	WI	-
001518932	Medicaid	PA	-

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.

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Frequently asked questions

How do I verify Frank Wittmaack's NPI record?

Cross-check NPI 1366494676 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1366494676 active?

Yes, as of the latest NPPES snapshot, NPI 1366494676 is active (record last updated 2024-08-19).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-19.