FIDDLEHEAD THERAPY PLLC
FIDDLEHEAD THERAPY PLLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003684432, based in Mountlake Terrace, WA. It is classified under Clinical Social Worker.
Getting there
Here is what surrounds this office in Mountlake Terrace, based on OpenStreetMap data collected Oct 14, 2026. Parking is available about 0.31 mi away at North Lot. The nearest transit stop is 827 ft away, served by 66th Ave W & 220th St SW. If you arrive early, there is a coffee shop 0.48 mi away.
Getting here and what is nearby
Restaurant Port of Subs 381 ft ~2 min
Transit 220th St SW & 66th Ave W 401 ft ~2 min
Convenience EZ Deli Mart 418 ft ~2 min
Restaurant Fork Mediterranean Grill 399 ft ~2 min
Mo-Sa 10:00-21:00; Su 11:00-20:00
Parking 477 ft ~2 min
Transit 220th St SW & 66th Ave W 538 ft ~3 min
Restaurant Subway 510 ft ~2 min
21919 66th Avenue West, Mountlake Terrace 98043
Mo-Fr 08:00-21:30; Sa-Su 09:00-21:00
Convenience La Placita Oxaquena 578 ft ~3 min
Parking 730 ft ~3 min
Gas station Shell 786 ft ~3 min
Transit 66th Ave W & 220th St SW 827 ft ~4 min
Convenience Jacksons 840 ft ~4 min
6602 220th Street Southwest, Mountlake Terrace
Parking North Lot 0.31 mi ~7 min
Coffee Sahm Gook Jih Palace 0.48 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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
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 | 1003684432 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Dec 14, 2023 |
| Last updated | Dec 14, 2023 |
| Status | Active |
| Practice address |
21907 64TH AVE W STE 330 Mountlake Terrace, WA 98043 (425) 399-7063 |
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 | 6 | 8 | 4 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 8 | 8 | 4 | 6 |
Sum = 58 · next multiple of 10 = 60 · check digit = 2 · actual last digit = 2
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.