Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Monticello Counseling Services Ps

Q: What is the NPI number for Monticello Counseling Services Ps?

The NPI for Monticello Counseling Services Ps is 1649465048, a Type 2 (organization) record in the CMS NPPES registry.

Clinical Social Worker in Longview, WA · enumerated 2007 · authorized official Len Zylstra, President.

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

National Provider Identifier

1649465048

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Registry record

Entity type Organization (Type 2)

Legal business name Monticello Counseling Services Ps

Practice address 1717 Olympia Way Ste 207, Longview, WA, 98632

Phone (360) 425-2819

Fax (360) 425-2819

Enumeration date Sep 9, 2007

Last updated in NPPES Oct 25, 2007

Taxonomy & classification

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LW00004277 (WA) Primary

Authorized official

Name Len Zylstra

Title President

Phone (360) 425-2819

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 is the NPI number for Monticello Counseling Services Ps?

The NPI for Monticello Counseling Services Ps is 1649465048, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Monticello Counseling Services Ps?

NPPES lists Len Zylstra (President) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-25.