Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Donald David Nimmer, M.D.

Family Medicine Physician in Greenfield, WI · enumerated 2005.

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

National Provider Identifier

1477555951

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Registry record

Entity type Individual (Type 1)

Name Donald David Nimmer

Credential M.D.

Sex Male

Practice address 4600 W Loomis Rd, Suite 130, Greenfield, WI, 53220

Phone (414) 389-4900

Fax (414) 465-4606

Enumeration date Aug 13, 2005

Last updated in NPPES Sep 19, 2022

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 29494 (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
31588100	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

Where does Donald Nimmer practice?

The practice location on file with NPPES is in Greenfield, WI. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Donald Nimmer?

The National Provider Identifier (NPI) for Donald Nimmer is 1477555951, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-19.