Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexi Themelis

Behavior Technician in Seattle, WA · enumerated 2021.

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

National Provider Identifier

1326617119

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Registry record

Entity type Individual (Type 1)

Name Alexi Themelis

Sex Male

Practice address 1455 Nw Leary Way, Seattle, WA, 98107

Phone (206) 504-3815

Enumeration date Jun 24, 2021

Last updated in NPPES Jun 24, 2021

Taxonomy & licenses

106S00000X Behavior Technician Behavioral Health & Social Service Providers 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.

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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 Alexi Themelis?

Alexi Themelis is registered in NPPES with the primary taxonomy of Behavior Technician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-24.