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

William Neil Pearson, MD

Cardiovascular Disease Physician in Southbury, CT · enumerated 2006.

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

National Provider Identifier

1255374112

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Registry record

Entity type Individual (Type 1)

Name William Neil Pearson

Credential MD

Sex Male

Practice address Southbury, CT, 06488

Phone (203) 264-5911

Fax (203) 264-9177

Enumeration date Jun 14, 2006

Last updated in NPPES Dec 12, 2017

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

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 25203 (CT) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 25203 (CT) 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
060000345	Other	CT	MEDICARE GROUP #
1252030	Medicaid	CT	-

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

How do I verify William Pearson's NPI record?

Cross-check NPI 1255374112 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1255374112 active?

Yes, as of the latest NPPES snapshot, NPI 1255374112 is active (record last updated 2017-12-12).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-12-12.