NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Mercer Island Therapy, Pllc

Clinical Social Worker in Mercer Island, WA · enumerated 2010 · authorized official Ron Feinberg, Partner.

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

National Provider Identifier

1003129461

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Mercer Island Therapy, Pllc
Other name <Unavail>
Practice address 8015 Se 28th St Ste 309, Mercer Island, WA, 98040
Phone (206) 236-1294
Fax (206) 257-3196
Enumeration date Jul 14, 2010
Last updated in NPPES Jan 3, 2022

Taxonomy & classification

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers Secondary
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers Primary
235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License LL00001598 (WA) Secondary

Authorized official

Name Ron Feinberg
Title Partner
Phone (206) 226-8879

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

How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2022-01-03. Verify at npiregistry.cms.hhs.gov.
Where is Mercer Island Therapy, Pllc located?
The practice location on file with NPPES is in Mercer Island, WA.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-03.