Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Robert Larosa Jr., M.D.

Specialist in Clearwater, FL · enumerated 2005.

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

National Provider Identifier

1801886403

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Registry record

Entity type Individual (Type 1)

Name Dr. William Robert Larosa Jr.

Credential M.D.

Sex Male

Practice address 430 Morton Plant St, Suite 206, Clearwater, FL, 33756

Phone (727) 441-1508

Fax (727) 443-7780

Enumeration date Oct 25, 2005

Last updated in NPPES Apr 18, 2012

Taxonomy & licenses

174400000X Specialist Other Service Providers · License ME45827 (FL) 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
046596800	Medicaid	FL	-

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

Is NPI 1801886403 active?

Yes, as of the latest NPPES snapshot, NPI 1801886403 is active (record last updated 2012-04-18).

How do I verify William Larosa's NPI record?

Cross-check NPI 1801886403 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-18.