Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Tasia Siereveld
Behavior Technician in Bellevue, WA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1235646464
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Registry record
Entity type Individual (Type 1)
Name Tasia Siereveld
Sex Female
Practice address 10400 Ne 4th St Ste 500, Bellevue, WA, 98004
Phone (425) 559-7809
Enumeration date Jan 9, 2018
Last updated in NPPES Jan 9, 2018
Taxonomy & licenses
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.
Frequently asked questions
What specialty is Tasia Siereveld?
Tasia Siereveld 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.
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.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-09.