Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Dineen Mary Tennihan, RN

Registered Nurse in Somerville, MA · enumerated 2010.

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

National Provider Identifier

1659674588

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Registry record

Entity type Individual (Type 1)

Name Mrs. Dineen Mary Tennihan

Credential RN

Sex Female

Practice address 236 Highland Ave, Somerville, MA, 02143

Phone (617) 591-4369

Fax (617) 591-4340

Enumeration date Dec 15, 2010

Last updated in NPPES Dec 15, 2010

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 176928 (MA) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN credential

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 Dineen Tennihan?

The National Provider Identifier (NPI) for Dineen Tennihan is 1659674588, a Type 1 (individual) record in the CMS NPPES registry.

Where does Dineen Tennihan practice?

The practice location on file with NPPES is in Somerville, MA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-15.