Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael Crispin Grebner, M. D.

Adult Medicine Physician in Milwaukee, WI · enumerated 2008 · practices at Wisconsin Community Services, Inc. Drug Evaluation Laboratory.

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

National Provider Identifier

1790940963

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael Crispin Grebner

Credential M. D.

Sex Male

Practice address 949 N 9th St, Health Services Unit, Milwaukee, WI, 53233

Phone (414) 226-7147

Fax (414) 226-7159

Enumeration date Jul 27, 2008

Last updated in NPPES Jul 27, 2008

Taxonomy & licenses

207QA0505X Adult Medicine Physician Allopathic & Osteopathic Physicians · License 32993 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Michael Grebner practice?

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

What is the NPI number for Michael Grebner?

The National Provider Identifier (NPI) for Michael Grebner is 1790940963, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-07-27.