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MALLORY THRALL
NPI 1255103362
Counselor - Mental Health in Seattle, WA

Active since October 23, 2023Opted out of Medicare · through Nov 27, 2027
3814 11TH AVE W, UNIT 26, SEATTLE, WA 98119(704) 966-9473 Get Directions Write a Review

NPPES record last updated: January 16, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Jan 16, 2026, Dec 11, 2023, Oct 23, 2023 (3 updates tracked since 2023).

About Mallory Thrall NPPES

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

MALLORY THRALL (NPI 1255103362) is an individual mental health provider in Seattle, Washington and active in the NPI registry since October 2023. She has opted out of Medicare through November 27, 2027 and maintains a secondary practice location in Richland.

NPPES Registry Identity

NPI1255103362
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameMALLORY THRALL
Location Address3814 11TH AVE W, UNIT 26Seattle, WA 98119
Mailing Address3814 11th Ave W, Unit 26Seattle, WA 98119 · (704) 966-9473
Phone(704) 966-9473
Sole ProprietorNo
Enumeration DateOctober 23, 2023
Last NPPES UpdateJanuary 16, 20263 updates tracked since enumeration
NPPES CertifiedJanuary 16, 2026
✔ NPI 1255103362 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
3814 11TH AVE W, Seattle, WA 98119
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Secondary Practice Location 1

Location 1639 Cullum Ave Unit 854Richland, WA 99352-5048 · Phone (509) 205-5559

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Mallory Thrall has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from November 27, 2025 through November 27, 2027.

Opt-Out Effective DateNovember 27, 2025
Opt-Out In Effect ThroughNovember 27, 2027Opt-out affidavits renew automatically every two years unless cancelled

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 Mallory Thrall's NPI number?

The NPI number for Mallory Thrall is 1255103362. It was assigned to this individual provider in the NPPES registry on October 23, 2023.

Where is Mallory Thrall located?

Mallory Thrall practices at 3814 11th Ave W Unit 26, Seattle, WA 98119. The listed phone number is (704) 966-9473.

What is Mallory Thrall's specialty?

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

Is Mallory Thrall enrolled in Medicare?

No. Mallory Thrall has opted out of Medicare through November 27, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

When was this NPI record last updated?

The NPPES record for Mallory Thrall was last updated on January 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.