Sydney Mastorides, LMSW
NPI 1700694411 · Clinical Social Worker · West Islip, NY
Sydney Mastorides, LMSW is a Clinical Social Worker provider in West Islip, NY (NPI 1700694411).
Provider details
- NPI number
- 1700694411
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LMSW
- Sex
- Female
- Sole proprietor
- No
- License
- 113433 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
1 yr 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
- 2024-12-27
- Last updated
- 2025-07-14
- Certified
- 2025-07-14
Frequently asked questions
- What is Sydney Mastorides's NPI number?
- Sydney Mastorides's National Provider Identifier (NPI) is 1700694411, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sydney Mastorides's specialty?
- Sydney Mastorides is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Sydney Mastorides located?
- Sydney Mastorides's practice location on file with NPPES is 467a Higbie Ln, West Islip, NY 11795-2240.
- What is Sydney Mastorides's phone number?
- The practice phone number listed in the NPPES registry for Sydney Mastorides is (516) 512-2409.
- Is Sydney Mastorides's NPI active?
- Yes — Sydney Mastorides's NPI (1700694411) is active in the NPPES registry as of the last update on 2025-07-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.