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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.

CRYSTAL MATHIESON
NPI 1447829502
Social Worker in Seattle, WA

Active since June 23, 2021
4715 42ND AVE SW APT 320, SEATTLE, WA 98116(253) 881-9854 Get Directions Write a Review

NPPES record last updated: September 10, 2026. Verified against the NPPES registry weekly; last sync: September 13, 2026.

Record update history: Sep 10, 2026, Jun 6, 2023, Sep 11, 2022 and 3 more (6 updates tracked since 2021).

About Crystal Mathieson NPPES

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

CRYSTAL MATHIESON (NPI 1447829502) is an individual social worker in Seattle, Washington and active in the NPI registry since June 2021.

NPPES Registry Identity

NPI1447829502
Entity TypeIndividualFemale
Primary Taxonomy104100000X
Provider Legal NameCRYSTAL MATHIESON
Location Address4715 42ND AVE SW APT 320Seattle, WA 98116-4620
Mailing Address4715 42nd Ave Sw Apt 320Seattle, WA 98116-4620 · (253) 881-9854
Phone(253) 881-9854
Sole ProprietorYes
Enumeration DateJune 23, 2021
Last NPPES UpdateSeptember 10, 20266 updates tracked since enumeration
NPPES CertifiedSeptember 10, 2026
✔ NPI 1447829502 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
4715 42ND AVE SW APT 320, Seattle, WA 98116
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Other Providers at the Same Location NPPES 4

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

THE DANIEL CLINIC, LLC
Counselor
4715 42ND AVE SW APT 320
SEATTLE, WA 98116
King County (253) 881-9854
JARRED LATHROP-WEBER LMFTA
Marriage & Family Therapist
4715 42ND AVE SW APT 320
SEATTLE, WA 98116
King County (253) 906-8738
KEVIN STUART FOSTER
Counselor
4715 42ND AVE SW APT 320
SEATTLE, WA 98116
King County (352) 723-7539
SHERI LOVE EARNSHAW LMHC
Counselor (Mental Health)
4715 42ND AVE SW APT 320
SEATTLE, WA 98116
King County (253) 881-9854

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 Crystal Mathieson's NPI number?

The NPI number for Crystal Mathieson is 1447829502. It was assigned to this individual provider in the NPPES registry on June 23, 2021.

Where is Crystal Mathieson located?

Crystal Mathieson practices at 4715 42nd Ave SW Apt 320, Seattle, WA 98116. The listed phone number is (253) 881-9854.

What is Crystal Mathieson's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

When was this NPI record last updated?

The NPPES record for Crystal Mathieson was last updated on September 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.