Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David L Groteluschen, M.D.

Medical Oncology Physician in Green Bay, WI · enumerated 2006.

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

National Provider Identifier

1679538011

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Registry record

Entity type Individual (Type 1)

Name David L Groteluschen

Credential M.D.

Sex Male

Practice address 1726 Shawano Ave, Green Bay, WI, 54303

Phone (920) 884-3135

Fax (920) 884-3144

Enumeration date Apr 19, 2006

Last updated in NPPES Dec 20, 2021

Taxonomy & licenses

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 44953 (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
34871500	Medicaid	WI	-
104894036	Medicaid	MI	-
DG088696	Other	MI	MICHIGAN BCBS

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

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 David Groteluschen?

David Groteluschen is registered in NPPES with the primary taxonomy of Medical Oncology Physician. 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 2021-12-20.