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

William Seijas, CCRN-CMC

Critical Care Medicine Registered Nurse in Paterson, NJ · enumerated 2025.

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

National Provider Identifier

1679465835

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Registry record

Entity type Individual (Type 1)

Name William Seijas

Credential CCRN-CMC

Sex Male

Practice address Paterson, NJ, 07503

Phone (973) 754-2000

Enumeration date Jul 21, 2025

Last updated in NPPES Jul 21, 2025

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

Taxonomy & licenses

163WC0200X Critical Care Medicine Registered Nurse Nursing Service Providers · License 26NR26076800 (NJ) Primary

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 1679465835 active?

Yes, as of the latest NPPES snapshot, NPI 1679465835 is active (record last updated 2025-07-21).

How do I verify William Seijas's NPI record?

Cross-check NPI 1679465835 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 2025-07-21.