Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Waltham Behavioral Health LLC

Q: What is the NPI number for Waltham Behavioral Health LLC?

The NPI for Waltham Behavioral Health LLC is 1427453000, a Type 2 (organization) record in the CMS NPPES registry.

Adult Psychiatric/Mental Health Registered Nurse in Waltham, MA · enumerated 2014 · authorized official Eleftheria Tsavoussis, Owner.

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

National Provider Identifier

1427453000

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Registry record

Entity type Organization (Type 2)

Legal business name Waltham Behavioral Health LLC

Practice address 210 Bear Hill Rd, Suite 202, Waltham, MA, 02451

Phone (781) 966-0070

Fax (781) 915-0755

Enumeration date Oct 25, 2014

Last updated in NPPES Jan 6, 2020

Taxonomy & classification

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 7194 (MA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 113314 (MA) Secondary

163WP0809X Adult Psychiatric/Mental Health Registered Nurse Nursing Service Providers Primary

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 205807 (MA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 280722 (MA) Secondary

364SP0809X Adult Psychiatric/Mental Health Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License 175264 (MA) Secondary

Authorized official

Name Eleftheria Tsavoussis

Title Owner

Phone (781) 966-0070

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 is the NPI number for Waltham Behavioral Health LLC?

The NPI for Waltham Behavioral Health LLC is 1427453000, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Waltham Behavioral Health LLC?

NPPES lists Eleftheria Tsavoussis (Owner) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-01-06.