Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mastery Mental Health PLLC

Organization Counselor · NPI 1356942064

Mastery Mental Health PLLC is a Counselor in Mukilteo, Washington. Registered with an NPI since 2020.

In the registry since
2020
Specialties on file
2
What do these letters mean?
PLLC — Professional limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

627 5th St Ste 200
Mukilteo, WA 98275-1580
Phone: (206) 309-3839
Fax: (425) 513-2329
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X
Counselor Taxonomy 101Y00000X

Record details

NPI number1356942064
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Geoffrey Simkins — Owner/Counselor · (360) 566-3722
NPI enumeratedNovember 9, 2020
Last updated in NPPESNovember 9, 2020
Certification dateNovember 9, 2020
Mailing address627 5th St Ste 200, Mukilteo, WA 98275-1580

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