IndividualActive
Sydney Castle
NPI 1477439594 · Social Worker · Seattle, WA
Sydney Castle is a Social Worker provider in Seattle, WA (NPI 1477439594).
Provider details
- NPI number
- 1477439594
- Entity type
- Individual
- Primary specialty
- Social WorkerBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
- License
- 61674183 (WA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Established profile(54/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in 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
901 Boren Ave Ste 900
Seattle, WA 98104-3596
Phone: (206) 257-3199
Street-level locationGet directions
Mailing address
22809 Lakeview Dr Apt E302
Mountlake Terrace, WA 98043-2880
Registry dates
- Enumerated
- 2025-08-13
- Last updated
- 2025-09-05
- Certified
- 2025-09-05
Frequently asked questions
- What is Sydney Castle's NPI number?
- Sydney Castle's National Provider Identifier (NPI) is 1477439594, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sydney Castle's specialty?
- Sydney Castle is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).
- Where is Sydney Castle located?
- Sydney Castle's practice location on file with NPPES is 901 Boren Ave Ste 900, Seattle, WA 98104-3596.
- What is Sydney Castle's phone number?
- The practice phone number listed in the NPPES registry for Sydney Castle is (206) 257-3199.
- Is Sydney Castle's NPI active?
- Yes — Sydney Castle's NPI (1477439594) is active in the NPPES registry as of the last update on 2025-09-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.