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

Wayne Allen Terpstra Jr., NCC, LMHC, CASAC,

Mental Health Counselor in Plattsburgh, NY · enumerated 2017 · practices at Adirondack Happiness Mental Health Counseling Pllc.

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

National Provider Identifier

1154855633

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Registry record

Entity type Individual (Type 1)
Name Wayne Allen Terpstra Jr.
Credential NCC, LMHC, CASAC,
Sex Male
Practice address Plattsburgh, NY, 12901
Phone (518) 314-9412
Enumeration date Apr 12, 2017
Last updated in NPPES Jun 15, 2026

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

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 013406 (NY) Primary
101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 31397 (NY) 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

Where does Wayne Terpstra practice?
The practice location on file with NPPES is in Plattsburgh, NY. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Wayne Terpstra?
The National Provider Identifier (NPI) for Wayne Terpstra is 1154855633, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-15.