Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Ms. Eleanor Ihmsen Mattis, MSW

Clinical Social Worker in Falls Church, VA · enumerated 2007.

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

National Provider Identifier

1518024330

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Registry record

Entity type Individual (Type 1)

Name Ms. Eleanor Ihmsen Mattis

Credential MSW

Sex Female

Practice address Falls Church, VA, 22044

Phone (703) 550-4334

Enumeration date Jan 2, 2007

Last updated in NPPES Dec 8, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 0904002312 (VA) Primary

Other identifiers

Identifier	Type	State	Issuer
F553-001	Other	VA	BLUE CROSS

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 Eleanor Mattis?

The National Provider Identifier (NPI) for Eleanor Mattis is 1518024330, a Type 1 (individual) record in the CMS NPPES registry.

Where does Eleanor Mattis practice?

The practice location on file with NPPES is in Falls Church, VA. 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 2011-12-08.