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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.

ALLYSON YLVISAKER
NPI 1609601905
Counselor - Mental Health in Seattle, WA

Active since September 05, 2024
1600 E OLIVE ST, SEATTLE, WA 98122(206) 901-2000 Get Directions Write a Review

NPPES record last updated: August 24, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Aug 24, 2026, Mar 13, 2026, Jan 13, 2026 and 1 more (4 updates tracked since 2024).

About Allyson Ylvisaker NPPES

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

ALLYSON YLVISAKER (NPI 1609601905) is an individual mental health provider in Seattle, Washington, licensed in Washington (MC70043326) and active in the NPI registry since September 2024.

NPPES Registry Identity

NPI1609601905
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameALLYSON YLVISAKER
Location Address1600 E OLIVE STSeattle, WA 98122-2735
Mailing Address6400 Southcenter BlvdTukwila, WA 98188-2547
Phone(206) 901-2000
Sole ProprietorNo
Enumeration DateSeptember 5, 2024
Last NPPES UpdateAugust 24, 20264 updates tracked since enumeration
NPPES CertifiedAugust 24, 2026
✔ NPI 1609601905 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in WA · MC70043326
Also ListedCounselor · Addiction (Substance Use Disorder)Taxonomy 101YA0400X · License CO70106443 (WA)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1600 E OLIVE ST, Seattle, WA 98122
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Other Providers at the Same Location NPPES 20

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

MISS LUCY P SPIRO RC
Student in an Organized Health Care Education/Training Program
1600 E OLIVE ST, SOUND MENTAL HEALTH
SEATTLE, WA 98122
King County (206) 302-2200
JAMES ELI SAAD BA, RC
Counselor (Professional)
1600 E OLIVE ST, SOUND MENTAL HEALTH
SEATTLE, WA 98122
King County (206) 302-2200
MS. BRENDA LYNNE' MILLER-SERMENO M.A, MHP
Counselor (Mental Health)
1600 E OLIVE ST, SOUND MENTAL HEALTH
SEATTLE, WA 98122
King County (206) 302-2200
MR. RICHARD WILLIAM IRWIN AAS, CDP
Counselor (Addiction (Substance Use Disorder))
1600 E OLIVE ST, SOUND MENTAL HEALTH
SEATTLE, WA 98122
King County (206) 302-2200
DR. BROOKE D KATZ ARNP
Nurse Practitioner (Psychiatric/Mental Health)
1600 E OLIVE ST
SEATTLE, WA 98122
King County (206) 302-2800
MISS MARBIE GUACEN DESCATAMIENTO BA, CDPT, AAC
Counselor (Mental Health)
1600 E OLIVE ST, SOUND MENTAL HEALTH
SEATTLE, WA 98122
King County (206) 302-2200
MS. SARAH C SAWYER
Counselor (Mental Health)
1600 E OLIVE ST
SEATTLE, WA 98122
King County (206) 302-2200
SHELLEY LYNN NIXON SHEPHERD RN, BSN
Registered Nurse
1600 E OLIVE ST
SEATTLE, WA 98122
King County (206) 901-2000

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 Allyson Ylvisaker's NPI number?

The NPI number for Allyson Ylvisaker is 1609601905. It was assigned to this individual provider in the NPPES registry on September 5, 2024.

Where is Allyson Ylvisaker located?

Allyson Ylvisaker practices at 1600 E Olive St, Seattle, WA 98122. The listed phone number is (206) 901-2000.

What is Allyson Ylvisaker's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

When was this NPI record last updated?

The NPPES record for Allyson Ylvisaker was last updated on August 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.