Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William C Haselow, M.D.

Emergency Medicine Physician in Eau Claire, WI · enumerated 2006.

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

National Provider Identifier

1811942444

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name William C Haselow

Credential M.D.

Sex Male

Practice address 900 W Clairemont Ave, Eau Claire, WI, 54701

Phone (414) 290-6715

Fax (414) 290-6755

Enumeration date May 23, 2006

Last updated in NPPES Dec 17, 2021

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 30013-020 (WI) Primary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 30013-20 (WI) Secondary

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
930068403	Other	WI	MEDICARE RAILROAD
31809700	Medicaid	WI	-
930072839	Other	WI	MEDICARE RAILROAD
930046182	Other	WI	MEDICARE RAILROAD

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

What is the NPI number for William Haselow?

The National Provider Identifier (NPI) for William Haselow is 1811942444, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Haselow practice?

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

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-17.