MERCER ISLAND THERAPY, PLLC
MERCER ISLAND THERAPY, PLLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003129461, based in Mercer Island, WA. The organization lists 3 taxonomy classifications, with Clinical Social Worker recorded as primary.
Getting there
Here is what surrounds this office in Mercer Island, based on OpenStreetMap data collected Sep 7, 2026. Parking is available about 0.28 mi away at Mercer Island Park & Ride. There is EV charging 0.24 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 997 ft away, served by 78th Ave SE & SE 32nd St. A pharmacy sits 0.21 mi from the entrance (Rite Aid), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 677 ft away.
Getting here and what is nearby
Parking 463 ft ~2 min
Grocery QFC 476 ft ~2 min
7823 Southeast 28th Street, Mercer Island 98040
24/7
Coffee Hub Boba 579 ft ~3 min
2900 78th Avenue Southeast, Mercer Island 98040
Parking 573 ft ~3 min
Restaurant Einstein Bros. Bagels 577 ft ~3 min
7808 Southeast 28th Street, Mercer Island 98040
Mo-Fr 06:00-15:00; Sa,Su 07:00-15:00
Transit 78th Ave SE & SE 28th St 651 ft ~3 min
Coffee Homegrown 625 ft ~3 min
3016 78th Avenue Southeast, Mercer Island 98040
Mo-Su 07:00-20:00
Coffee L’Experience Paris 677 ft ~3 min
Transit 78th Ave SE & SE 28th St 745 ft ~3 min
Convenience Jacksons 795 ft ~4 min
2903 78th Avenue Southeast, Mercer Island 98040
Restaurant McDonald's 895 ft ~4 min
2807 78th Avenue Southeast, Mercer Island 98040-2818
Mo-Th 05:00-23:00; Fr,Sa 06:00-23:00; Su 06:00-23:00
Restaurant Sushi Joa 916 ft ~4 min
2717 78th Avenue Southeast, Mercer Island 98040
Mo-Th 11:30-21:00; Fr 11:30-21:30; Sa 11:30-21:00
Transit 78th Ave SE & SE 32nd St 997 ft ~4 min
Pharmacy Walgreens 988 ft ~4 min
Mo-Su 07:00-24:00
Pharmacy Rite Aid 0.21 mi ~5 min
Grocery Metropolitan Market 0.23 mi ~5 min
2755 77th Avenue Southeast, Mercer Island 98040
Mo-Su 06:00-23:00
EV charging 0.24 mi ~5 min
Parking Mercer Island Park & Ride 0.28 mi ~6 min
8000 North Mercer Way, Mercer Island 98040
Convenience ExtraMile 0.29 mi ~6 min
7655 Sunset Highway, Mercer Island 98040
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| LL00001598 | WA | Speech-Language Pathologist |
This provider holds licence LL00001598 issued in WA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Clinical covers
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances. NUCC Health Care Provider Taxonomy, code 1041C0700X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TC0700X | Clinical Psychologist Clinical | — | — | |
| 235Z00000X | Speech-Language Pathologist | LL00001598 | WA | |
| 1041C0700X | Clinical Social Worker Clinical | — | — | primary |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003129461 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jul 14, 2010 |
| Last updated | Jan 3, 2022 |
| Status | Active |
| Practice address |
8015 SE 28TH ST STE 309 Mercer Island, WA 98040 (206) 236-1294 Fax (206) 257-3196 |
| Mailing address |
8015 SE 28TH ST SUITE 309 Mercer Island, WA 98040 |
| Other names |
Northwest Speech Therapy / Spotlight Social Skills Former Legal Name |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 1 | 2 | 9 | 4 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 2 | 9 | 4 | 3 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.