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

Mr. Robert J. O'Brien, MSW, LMSW

Clinical Social Worker in Petoskey, MI · enumerated 2005.

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

National Provider Identifier

1205837903

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Registry record

Entity type Individual (Type 1)

Name Mr. Robert J. O'Brien

Credential MSW, LMSW

Sex Male

Practice address Petoskey, MI, 49770

Phone (231) 487-4694

Fax (231) 347-9405

Enumeration date Aug 3, 2005

Last updated in NPPES Nov 15, 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 6801057605 (MI) Primary

Other identifiers

Identifier	Type	State	Issuer
8008941730	Other	MI	BC/BS PROVIDER NUMBER

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 does Robert O'Brien practice?

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

What is the NPI number for Robert O'Brien?

The National Provider Identifier (NPI) for Robert O'Brien is 1205837903, a Type 1 (individual) record in the CMS NPPES registry.

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Katherine Sapek Mental Health Counselor · Petoskey, MI NPI 1083494363

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-11-15.