Mastery Mental Health PLLC
NPI 1356942064 · Clinical Social Worker · Mukilteo, WA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mastery Mental Health PLLC is a Clinical Social Worker organization in Mukilteo, WA (NPI 1356942064).
Provider details
- NPI number
- 1356942064
- Entity type
- Organization
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- Geoffrey Simkins, Owner/Counselor(360) 566-3722
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Counselor101Y00000X
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-11-09
- Last updated
- 2020-11-09
- Certified
- 2020-11-09
Frequently asked questions
- What is Mastery Mental Health PLLC's NPI number?
- Mastery Mental Health PLLC's National Provider Identifier (NPI) is 1356942064, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mastery Mental Health PLLC?
- Mastery Mental Health PLLC is classified in the NPPES registry as Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mastery Mental Health PLLC located?
- Mastery Mental Health PLLC's practice location on file with NPPES is 627 5th St Ste 200, Mukilteo, WA 98275-1580.
- What is Mastery Mental Health PLLC's phone number?
- The practice phone number listed in the NPPES registry for Mastery Mental Health PLLC is (206) 309-3839.
- Does Mastery Mental Health PLLC accept Medicare?
- Mastery Mental Health PLLC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Mastery Mental Health PLLC?
- The authorized official listed on Mastery Mental Health PLLC's NPPES record is Geoffrey Simkins, Owner/Counselor. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mastery Mental Health PLLC's NPI active?
- Yes — Mastery Mental Health PLLC's NPI (1356942064) is active in the NPPES registry as of the last update on 2020-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.