Maria R. O'Brien, MD
Family Medicine Physician · Bristol, CT
Maria R. O'Brien, MD is a family medicine physician with a practice address in Bristol, Connecticut, and NPI 1992718068, issued on Aug 13, 2006. Check the license (Connecticut 038427, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Maria R. O'Brien
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 038427 CT
Self-reported in NPPES; status is on the state search - Practice location
- 61 Bradley St, Bristol, CT 06010
- Phone
- (860) 314-6898
- Enumerated
- Aug 13, 2006
- Record last updated
- Mar 4, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (860) 314-6896
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 958 in Connecticut → Look up another NPI →
Also registered at 61 Bradley St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Corinne Ferola, LCSWClinical Social Worker1275510539
- Louis HurwitzProfessional Counselor1114502978
- Mary Ann KoprekFamily Nurse Practitioner1184266967
- Marisa Lee Kim, M.D.Internal Medicine Physician1144670639
- Mary Marsh, M.S., L.M.F.T.Mental Health Counselor1588682660
- Nicole MichaudProfessional Counselor1194155879
Verify Maria R. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 038427Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
19 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 95% of claims.
Most prescribed
- Ozempic14 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.
Maria R. O'Brien among 958 family medicine physician records in Connecticut
Maria R. O'Brien, MD is one of 958 family medicine physician records with a practice address in Connecticut. 79% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 57% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2010 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
16 family medicine physician records list a practice address in Bristol
They are 16 of the 854 NPPES records with a practice address in Bristol, and 958 family medicine physician records in Connecticut.
All 958 in Connecticut → Every provider in Bristol → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Lea Bailey, MDBristol, CT 060101205847134
- Erica Buss, RNBristol, CT 060101982129938
- Devorah Donnell, M.D.Bristol, CT 060101093196941
- Jeffrey Goldberg, MDBristol, CT 060101093723983
- Hassan Loutfi, DOBristol, CT 060101952756918
- Jennifer Mastrocola, MDBristol, CT 060101972896561
- John Montminy, D.OBristol, CT 060101558478305
- Vijai Muthukrishnan, M.D.Bristol, CT 060101003016270
Common questions
What is Maria R. O'Brien, MD's NPI number?
Maria R. O'Brien, MD's National Provider Identifier (NPI) is 1992718068, issued on Aug 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maria R. O'Brien, MD located?
The NPPES record lists a practice address at 61 Bradley St, Bristol, CT, 06010. Phone: (860) 314-6898. Providers update this record themselves, so call before visiting.
How can I verify Maria R. O'Brien, MD's license?
NPPES lists Connecticut license number 038427, 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 Maria R. O'Brien, MD prescribe under Medicare Part D?
In 2024, Maria R. O'Brien, MD had 19 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.