Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

On-Site Therapists, Inc.

Speech-Language Pathologist in Chelsea, MA · enumerated 2007 · authorized official Ellen Hemrick, Owner.

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

National Provider Identifier

1811196884

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Registry record

Entity type Organization (Type 2)

Legal business name On-Site Therapists, Inc.

Practice address 121b Hawthorne St, #1, Chelsea, MA, 02150

Phone (617) 872-1030

Enumeration date Jul 11, 2007

Last updated in NPPES Jul 11, 2007

Taxonomy & classification

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 5273 (MA) Primary

Authorized official

Name Ellen Hemrick

Title Owner

Phone (617) 872-1030

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

Where is On-Site Therapists, Inc. located?

The practice location on file with NPPES is in Chelsea, MA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2007-07-11. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-11.