MARK LEVI BRIGGS LMHCA
NPI 1598435117
Counselor in Issaquah, WA

Q: What is Mark Briggs's NPI number?

The NPI number for Mark Briggs is 1598435117. It was assigned to this individual provider in the NPPES registry on September 15, 2021.

Q: What is Mark Briggs's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Mark Briggs was last updated on January 6, 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.

Active since September 15, 2021

PO BOX 3057, ISSAQUAH, WA 98027(425) 835-2503(425) 285-5436 Get Directions Write a Review

NPPES record last updated: January 6, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jan 6, 2026, Sep 15, 2021 (2 updates tracked since 2021).

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About Mark Levi Briggs Lmhca NPPES

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

MARK LEVI BRIGGS LMHCA (NPI 1598435117) is an individual counselor in Issaquah, Washington, licensed in Washington (CG61099654) and active in the NPI registry since September 2021.

NPPES Registry Identity

NPI1598435117

Entity TypeIndividualMale

Primary Taxonomy101Y00000X

Provider Legal NameMARK LEVI BRIGGSCredential: LMHCA

Location AddressPO BOX 3057Issaquah, WA 98027-0137

Mailing AddressPo Box 3057Issaquah, WA 98027-0137 · (425) 835-2503 · Fax (425) 285-5436

Phone(425) 835-2503

Fax(425) 285-5436

Sole ProprietorNo

Enumeration DateSeptember 15, 2021

Last NPPES UpdateJanuary 6, 20262 updates tracked since enumeration

NPPES CertifiedJanuary 6, 2026

✔ NPI 1598435117 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselorBehavioral Health & Social Service Providers

Taxonomy Code101Y00000X

License✔ Licensed in WA · CG61099654

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.

PO BOX 3057, Issaquah, WA 98027

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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 Mark Briggs's NPI number?

The NPI number for Mark Briggs is 1598435117. It was assigned to this individual provider in the NPPES registry on September 15, 2021.

Where is Mark Briggs located?

Mark Briggs practices at PO Box 3057, Issaquah, WA 98027. The listed phone number is (425) 835-2503.

What is Mark Briggs'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 Mark Briggs was last updated on January 6, 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.