Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

William G. Tsiaras, M.D.

Ophthalmology Physician in Providence, RI · enumerated 2006.

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

National Provider Identifier

1376609180

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Registry record

Entity type Individual (Type 1)

Name William G. Tsiaras

Credential M.D.

Sex Male

Practice address Providence, RI, 02905

Phone (401) 831-4592

Fax (401) 831-4643

Enumeration date Dec 28, 2006

Last updated in NPPES Jul 18, 2016

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 4952 (RI) 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
002289	Other	RI	BCBS - BLUE CHIP
9000834	Medicaid	RI	-
9810	Other	RI	NEIGHBORHOOD HEALTH PLAN OF RI
15064RIH	Other	RI	HARVARD PILGRIM HEALTHCARE
180021373	Other	RI	RAILROAD MEDICARE
834	Other	RI	BCBS OF RI

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

What is the NPI number for William Tsiaras?

The National Provider Identifier (NPI) for William Tsiaras is 1376609180, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Tsiaras practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-07-18.