Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William J Alfieri D.C., P.C.

Q: What type of organization is William J Alfieri D.C., P.C.?

William J Alfieri D.C., P.C. is registered in NPPES as a Chiropractor (its primary provider taxonomy).

Chiropractor in Portage, MI · enumerated 2007 · authorized official William Alfieri, President.

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

National Provider Identifier

1598987604

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Registry record

Entity type Organization (Type 2)

Legal business name William J Alfieri D.C., P.C.

Other name <Unavail>

Practice address 925 W Milham Ave, Portage, MI, 49024

Phone (269) 327-8990

Fax (269) 327-6214

Enumeration date May 2, 2007

Last updated in NPPES Mar 14, 2008

Taxonomy & classification

111N00000X Chiropractor Chiropractic Providers · License WM004080 (MI) Primary

Authorized official

Name William Alfieri

Title President

Phone (269) 327-8990

Other identifiers

Identifier	Type	State	Issuer
764733	Other	MI	FIRST HEALTH
649415	Other	MI	ACN
138342	Other	MI	PREFERRED CHOICES PPO
0C95034	Other	MI	MEDICARE PART B
4430054	Other	MI	IBA
4430054	Other	MI	UNITED HEALTHCARE
0C95034	Other	-	MEDICARE ID TYPE UNSPECIF
155514	Other	MI	GREAT LAKES HEALTH PLAN

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 a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is William J Alfieri D.C., P.C.?

William J Alfieri D.C., P.C. is registered in NPPES as a Chiropractor (its primary provider taxonomy).

Providers at this address

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William Alfieri Chiropractor · Portage, MI NPI 1437143203 Nicholas Alfieri Chiropractor · Portage, MI NPI 1659602308

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-14.