Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Colleen Williams

Registered Nurse in Grass Valley, CA · enumerated 2007.

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

National Provider Identifier

1205025590

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Registry record

Entity type Individual (Type 1)

Name Colleen Williams

Sex Female

Practice address 500 Crown Point Cir Ste 110, Grass Valley, CA, 95945

Phone (530) 265-1450

Fax (530) 271-0837

Enumeration date Oct 23, 2007

Last updated in NPPES Oct 23, 2007

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License Y335419 (CA) 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

What specialty is Colleen Williams?

Colleen Williams is registered in NPPES with the primary taxonomy of Registered Nurse. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-23.