Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cassandra L O'Brien, APRN

Nurse Practitioner in Winter Park, FL · enumerated 2018.

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

National Provider Identifier

1821597717

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Registry record

Entity type Individual (Type 1)

Name Cassandra L O'Brien

Credential APRN

Sex Female

Practice address 1605 W Fairbanks Ave, Winter Park, FL, 32789

Phone (407) 845-8356

Enumeration date Feb 6, 2018

Last updated in NPPES Jan 6, 2026

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License APRN9363285 (FL) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License APRN9363285 (FL) Primary

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

Other identifiers

Identifier	Type	State	Issuer
ARNP9363285	Other	FL	MEDICAL LICENSE

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 Cassandra O'Brien practice?

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

What is the NPI number for Cassandra O'Brien?

The National Provider Identifier (NPI) for Cassandra O'Brien is 1821597717, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-06.