Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Alvarez, M.D.

Gastroenterology Physician in Manitowoc, WI · enumerated 2006.

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

National Provider Identifier

1780792887

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Registry record

Entity type Individual (Type 1)

Name William Alvarez

Credential M.D.

Sex Male

Practice address 1900 Woodland Dr, Manitowoc, WI, 54220

Phone (920) 320-6212

Fax (920) 684-5548

Enumeration date Aug 28, 2006

Last updated in NPPES Jul 3, 2012

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 46006 (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
14832	Other	WI	NETWORK HEALTH PLAN
34429800	Medicaid	WI	-
P00088531	Other	WI	RAILROAD MEDICARE
H96061	Other	WI	CIGNA
390806395	Other	WI	ANTHEM
46006	Other	WI	TOUCHPOINT

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 William Alvarez?

William Alvarez is registered in NPPES with the primary taxonomy of Gastroenterology 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 2012-07-03.