Margaret M. O'Neill, MD
Pediatric Adolescent Medicine Physician · West Hartford, CT
Margaret M. O'Neill, MD is a pediatric adolescent medicine physician with a practice address in West Hartford, Connecticut, and NPI 1942319157, issued on Aug 30, 2006. Check the license (Connecticut 035312, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Margaret M. O'Neill
- Credential
- MD
- Primary taxonomy
- Pediatric Adolescent Medicine Physician 2080A0000X
- License number
- 035312 CT
Self-reported in NPPES; status is on the state search - Practice location
- 970 Farmington Ave Ste 201, West Hartford, CT 06107
- Phone
- (860) 561-4300
- Enumerated
- Aug 30, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (860) 561-1635
- Medicaid ID
- 00135312700 CT
- Entity
- Type 1 · individual
8 nearest pediatric adolescent medicine physician records → All 79 in Connecticut → Look up another NPI →
Also registered at 970 Farmington Ave Ste 201
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelly Smith, MDPediatrics Physician1912526112
Verify Margaret M. O'Neill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 035312Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $17.68
1 payment: food and beverage; the largest payer was GlaxoSmithKline, LLC. The 859 providers of this specialty with any payment received $389.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Margaret M. O'Neill among 79 pediatric adolescent medicine physician records in Connecticut
Margaret M. O'Neill, MD is one of 79 pediatric adolescent medicine physician records with a practice address in Connecticut. 46% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 22% newer
- In a Medicare fileYes · 46% of these records are
- In the CMS Doctors and Clinicians fileNo · 3% of these records are
- Record last updated2007 · 73% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080A0000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Adolescent Medicine Physician providers in Connecticut
There are 79 pediatric adolescent medicine physician records in Connecticut.
All 79 in Connecticut → Every provider in West Hartford → Pediatric Adolescent Medicine Physician nationwide →
The 8 pediatric adolescent medicine physician records with the nearest ZIP codes
- Della Corcoran, MDWest Hartford, CT 061071396716353
- Leo Distefano, MDWest Hartford, CT 061071760453724
- Jessica Maccormac, DOHartford, CT 061061285933655
- Jayashree Venkatesh, M.D.East Hartford, CT 061081447487723
- Elaine Yordan, MDHartford, CT 061051790783702
- Grael O'Brien, M.D.Hartford, CT 061121366454621
- Allyson Duffy, MDWest Hartford, CT 061171154399202
- Sarah Elbaum, MDWest Hartford, CT 061171720202922
Common questions
What is Margaret M. O'Neill, MD's NPI number?
Margaret M. O'Neill, MD's National Provider Identifier (NPI) is 1942319157, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret M. O'Neill, MD located?
The NPPES record lists a practice address at 970 Farmington Ave Ste 201, West Hartford, CT, 06107. Phone: (860) 561-4300. Providers update this record themselves, so call before visiting.
How can I verify Margaret M. O'Neill, MD's license?
NPPES lists Connecticut license number 035312, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.