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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

UNDERSTORY THERAPY, PLLC
NPI 1629934468
Counselor in Vashon, WA

Active since December 24, 2025
17223 VASHON HWY SW, VASHON, WA 98070(206) 627-0570 Get Directions Write a Review

NPPES record last updated: August 26, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Aug 26, 2026, Apr 24, 2026, Dec 24, 2025 (3 updates tracked since 2025).

About Understory Therapy, Pllc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

UNDERSTORY THERAPY, PLLC (NPI 1629934468) is a healthcare organization registered as a counselor in Vashon, Washington and active in the NPI registry since December 2025. The organization lists Patrick Phelan, Lmhc, as its authorized official.

NPPES Registry Identity

NPI1629934468
Entity TypeOrganization
Primary Taxonomy101Y00000X
Legal Business NameUNDERSTORY THERAPY, PLLC
Location Address17223 VASHON HWY SWVashon, WA 98070-4634
Mailing Address20325 87th Ave SwVashon, WA 98070-6215
Phone(206) 627-0570
Organization SubpartNo
Authorized OfficialPatrick PhelanLmhc · (206) 627-0570
Enumeration DateDecember 24, 2025
Last NPPES UpdateAugust 26, 20263 updates tracked since enumeration
NPPES CertifiedAugust 26, 2026
✔ NPI 1629934468 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselorBehavioral Health & Social Service Providers
Taxonomy Code101Y00000X
Definition
A provider who is trained and educated in the performance of behavior health services through interpersonal communications and analysis. Training and education at the specialty level usually requires a master's degree and clinical experience and supervision for licensure or certification.
17223 VASHON HWY SW, Vashon, WA 98070
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

HELEN B TAYLOR LMHC
Counselor (Mental Health)
17223 VASHON HWY SW
VASHON, WA 98070
King County (206) 259-3104
PATRICK PHELAN MA
Counselor
17223 VASHON HWY SW
VASHON, WA 98070
King County (206) 627-0570

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Understory Therapy, PLLC's NPI number?

The NPI number for Understory Therapy, PLLC is 1629934468. It was assigned to this organization in the NPPES registry on December 24, 2025.

Where is Understory Therapy, PLLC located?

Understory Therapy, PLLC is located at 17223 Vashon Hwy SW, Vashon, WA 98070. The listed phone number is (206) 627-0570.

What is Understory Therapy, PLLC's specialty?

The primary specialty registered for this NPI is Counselor with taxonomy code 101Y00000X.

When was this NPI record last updated?

The NPPES record for Understory Therapy, PLLC was last updated on August 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.