Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Armstrong, MSW

Counselor in Ukiah, CA · enumerated 2008.

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

National Provider Identifier

1841443389

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Registry record

Entity type Individual (Type 1)

Name William Armstrong

Credential MSW

Sex Male

Practice address 780 S Dora St, Ukiah, CA, 95482

Phone (707) 472-2922

Enumeration date Oct 28, 2008

Last updated in NPPES Apr 20, 2017

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

101Y00000X Counselor Behavioral Health & Social Service Providers Primary

171M00000X Case Manager/Care Coordinator Other Service Providers Secondary

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

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.

What specialty is William Armstrong?

William Armstrong is registered in NPPES with the primary taxonomy of Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Erika Tsonetokoy Coyle Rehabilitation Practitioner · Ukiah, CA NPI 1659524346 Denise Addison Rehabilitation Practitioner · Ukiah, CA NPI 1508098229 Sarah Livingston Rehabilitation Practitioner · Ukiah, CA NPI 1285936385 Rachel Young Marriage & Family Therapist · Ukiah, CA NPI 1508102864 Frances Dimech Rehabilitation Practitioner · Ukiah, CA NPI 1245570233 Lawrence Lazaro Rehabilitation Practitioner · Ukiah, CA NPI 1346667029 Greg Gates Counselor · Ukiah, CA NPI 1861811143 Annette Simmons Marriage & Family Therapist · Ukiah, CA NPI 1417359159

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-04-20.