Margaret Ryan O'Neill, MD
Obstetrics & Gynecology Physician · Glastonbury, CT
Margaret Ryan O'Neill, MD is an obstetrics & gynecology physician with a practice address in Glastonbury, Connecticut, and NPI 1255918868, issued on Mar 28, 2021. Check the license (Connecticut 083062, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Margaret Ryan O'Neill
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 083062 CT
Self-reported in NPPES; status is on the state search - Practice location
- 330 Western Blvd Ste 102, Glastonbury, CT 06033
- Phone
- (860) 547-0306
- Enumerated
- Mar 28, 2021
- Record last updated
- Sep 30, 2025
- Medicare enrollment
- Enrolled (PECOS I20251003002348); accepts Medicare assignment
- Medical or professional school
- University Of Connecticut School Of Medicine, 2021
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 707 in Connecticut → Look up another NPI →
Also registered at 330 Western Blvd Ste 102
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jamie Benway, MDObstetrics & Gynecology Physician1922392109
- Stephanie Chung, M.D.Obstetrics & Gynecology Physician1932630449
- Shannon Colborn, APRNWomen's Health Nurse Practitioner1821555129
- Alexi Girard, PA-CPhysician Assistant1225407141
- Michele Labas, CNMAdvanced Practice Midwife1205410644
- Kathleen MillerFamily Nurse Practitioner1699232207
Verify Margaret Ryan O'Neill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 083062Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
49 Medicare Part D claims for 22 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Oxycodone Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Physicians For Women's Health, LLCHartford, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Ryan O'Neill among 707 obstetrics & gynecology physician records in Connecticut
Margaret Ryan O'Neill, MD is one of 707 obstetrics & gynecology physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 94% of them.
- NPI issued2021 · 94% of these records are older, 2% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2021 · median 2003 among the 488 with a school on file
- Record last updated2025 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Connecticut
There are 707 obstetrics & gynecology physician records in Connecticut.
All 707 in Connecticut → Every provider in Glastonbury → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Jamie Benway, MDGlastonbury, CT 060331922392109
- Stephanie Chung, M.D.Glastonbury, CT 060331932630449
- Eugene Rozenshteyn, MDGlastonbury, CT 060331083881544
- Shannon Sutherland, MDGlastonbury, CT 060331508277575
- Natalie Webb, MDGlastonbury, CT 060331396945085
- Prachi Godiwala, M.D.Farmington, CT 060321417335415
- Jacqueline Fleuriscar, MDFarmington, CT 060301235690058
- Kimberly Forlenza, MDFarmington, CT 060301982283016
Common questions
What is Margaret Ryan O'Neill, MD's NPI number?
Margaret Ryan O'Neill, MD's National Provider Identifier (NPI) is 1255918868, issued on Mar 28, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Ryan O'Neill, MD located?
The NPPES record lists a practice address at 330 Western Blvd Ste 102, Glastonbury, CT, 06033. Phone: (860) 547-0306. Providers update this record themselves, so call before visiting.
How can I verify Margaret Ryan O'Neill, MD's license?
NPPES lists Connecticut license number 083062, 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.
How much does Margaret Ryan O'Neill, MD prescribe under Medicare Part D?
In 2024, Margaret Ryan O'Neill, MD had 49 Medicare Part D claims for 22 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
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.