Thomas O'Brien, M.D.
Infectious Disease Physician · Warwick, RI
Thomas O'Brien, M.D. is an infectious disease physician with a practice address in Warwick, Rhode Island, and NPI 1801246491, issued on Jun 15, 2016. Check the license (Rhode Island MD17913, as entered in NPPES) on the Rhode Island Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Thomas O'Brien
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License numbers
- MD17913 RI
LP03709 RI
Self-reported in NPPES; status is on the state search - Practice location
- 455 Toll Gate RD, Warwick, RI 02886
- Phone
- (401) 273-0641
- Enumerated
- Jun 15, 2016
- Record last updated
- Jul 28, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210810003310); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2016
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 66 in Rhode Island → Look up another NPI →
Also registered at 455 Toll Gate RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Reshma Abraham, MDInternal Medicine Physician1972943413
- Ahmad Abu Dayyeh, MDInternal Medicine Physician1265322275
- Hadeel Al-Rawi, MDInternal Medicine Physician1780569533
- Matthew AlamEmergency Medicine Physician1609718170
- Mareena Aldayani, DOStudent in an Organized Health Care Education/Training Program1740977610
- Khalid Alhourani, MDPulmonary Disease Physician1831232636
Verify Thomas O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersRhode Island Board of Medical Licensure and Discipline
Search for license MD17913Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average infectious disease physician in 2024
79 Medicare Part D claims for 36 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of 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
- Affinity Physicians LLC.Warwick, RI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas O'Brien among 66 infectious disease physician records in Rhode Island
Thomas O'Brien, M.D. is one of 66 infectious disease physician records with a practice address in Rhode Island. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 79% of them.
- NPI issued2016 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2016 · median 2004 among the 45 with a school on file
- Record last updated2021 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Rhode Island practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Rhode Island
There are 66 infectious disease physician records in Rhode Island.
All 66 in Rhode Island → Every provider in Warwick → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- David Lowe, MDWarwick, RI 028861831207752
- Diana Villanueva Donmez, MDWarwick, RI 028861801356332
- Hadeel Zainah, M.D.Warwick, RI 028861457515603
- Brian Cilley, DOWakefield, RI 028791760668487
- Michael Poshkus, MDWest Warwick, RI 028931952341075
- Sapna Chowdhry, MDWoonsocket, RI 028951902843311
- Angela Caliendo, M.D., PH.D.Providence, RI 029031063470995
- Eirini Christaki, M.D.Providence, RI 029031972706331
Common questions
What is Thomas O'Brien, M.D.'s NPI number?
Thomas O'Brien, M.D.'s National Provider Identifier (NPI) is 1801246491, issued on Jun 15, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Thomas O'Brien, M.D. located?
The NPPES record lists a practice address at 455 Toll Gate RD, Warwick, RI, 02886. Phone: (401) 273-0641. Providers update this record themselves, so call before visiting.
How can I verify Thomas O'Brien, M.D.'s license?
NPPES lists Rhode Island license number MD17913, as entered by the provider. Search the Rhode Island Board of Medical Licensure and Discipline at https://healthri.mylicense.com/Verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas O'Brien, M.D. prescribe under Medicare Part D?
In 2024, Thomas O'Brien, M.D. had 79 Medicare Part D claims for 36 beneficiaries; the average among infectious disease physician prescribers was 689. 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.