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

Ms. Nellie Faith O'Reilly, MSW, LCSW, RPT

Clinical Social Worker in Lakeside, MT · enumerated 2006.

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

National Provider Identifier

1497773980

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Ms. Nellie Faith O'Reilly

Credential MSW, LCSW, RPT

Sex Female

Practice address Lakeside, MT, 59922

Phone (406) 750-5784

Enumeration date Jul 17, 2006

Last updated in NPPES Apr 9, 2018

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 685 (MT) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

Other identifiers

Identifier	Type	State	Issuer
4047201	Other	-	BHP PREFERRED ONE
321G6OR	Other	-	BCBS
136290	Other	-	U CARE
974602100	Other	-	MHCP

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 Nellie O'Reilly?

Nellie O'Reilly is registered in NPPES with the primary taxonomy of Clinical Social Worker. 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-04-09.