Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Francis James O'Sullivan, MS, APRN,BC

Psychiatric/Mental Health Clinical Nurse Specialist in Boston, MA · enumerated 2006.

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

National Provider Identifier

1386655496

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Registry record

Entity type Individual (Type 1)

Name Mr. Francis James O'Sullivan

Credential MS, APRN,BC

Sex Male

Practice address 251 Causeway St, Boston, MA, 02114

Phone (617) 248-1053

Fax (617) 248-1121

Enumeration date Aug 11, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

364SP0808X Psychiatric/Mental Health Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License RN173665PC (MA) Primary

APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists. About the APRN 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

How do I verify Francis O'Sullivan's NPI record?

Cross-check NPI 1386655496 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1386655496 active?

Yes, as of the latest NPPES snapshot, NPI 1386655496 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.