Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Margaret M O'Neill, MD
Pediatric Adolescent Medicine Physician in West Hartford, CT · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1942319157
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2883835 | Other | CT | AETNA |
| 9046149 | Other | CT | CIGNA |
| 010035312CT02 | Other | CT | ANTHEM BLUE CROSS BLUE SH |
| 035312 | Other | CT | CONNECTICARE |
| P2089091 | Other | CT | OXFORD |
| 00135312700 | Medicaid | CT | - |
| 2V2626 | Other | CT | HEALTHNET |
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.
Frequently asked questions
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Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.