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

Dr. William N Schreiber, MD

Internal Medicine Physician in Woodbridge, CT · enumerated 2005.

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

National Provider Identifier

1366441826

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Registry record

Entity type Individual (Type 1)

Name Dr. William N Schreiber

Credential MD

Sex Male

Practice address Woodbridge, CT, 06525

Phone (203) 397-3950

Enumeration date Jul 18, 2005

Last updated in NPPES Oct 17, 2011

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 023066 (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
NHP061	Other	CT	OXFORD
110167933	Other	CT	RAILROAD MEDICARE
230660	Other	CT	CONNECTICARE
010023066CT01	Other	CT	BLUE CROSS BLUE SHIELD
0Q2056	Other	CT	HEALTH NET
2047266	Other	CT	AETNA

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 Schreiber's NPI record?

Cross-check NPI 1366441826 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1366441826 active?

Yes, as of the latest NPPES snapshot, NPI 1366441826 is active (record last updated 2011-10-17).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-17.