Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Sandra O'Neil-Callahan, WHNP-BC

Women's Health Nurse Practitioner in St. Louis, MO · enumerated 2012.

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

National Provider Identifier

1114279502

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Registry record

Entity type Individual (Type 1)

Name Mrs. Sandra O'Neil-Callahan

Credential WHNP-BC

Sex Female

Practice address 4251 Forest Park Avenue, St. Louis, MO, 63108

Phone (314) 531-7526

Enumeration date Oct 9, 2012

Last updated in NPPES Jul 23, 2013

Taxonomy & licenses

363LW0102X Women's Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 2012033869 (MO) Primary

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 Sandra O'Neil-Callahan's NPI record?

Cross-check NPI 1114279502 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1114279502 active?

Yes, as of the latest NPPES snapshot, NPI 1114279502 is active (record last updated 2013-07-23).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-07-23.