NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Miss Anna Efstratiou, MSW, CASAC

Counselor in Islip, NY · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1740320902

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Miss Anna Efstratiou
Credential MSW, CASAC
Sex Female
Practice address 401 Main St, Islip, NY, 11751
Phone (631) 224-5330
Enumeration date Feb 7, 2007
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers · License 4929 (NY) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Anna Efstratiou?
Anna Efstratiou is registered in NPPES with the primary taxonomy of Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.