Eileen Elizabeth O'Regan, MD
Internal Medicine Physician · Cheshire, CT
Eileen Elizabeth O'Regan, MD is an internal medicine physician with a practice address in Cheshire, Connecticut, and NPI 1932273299, issued on Nov 20, 2006. Check the license (Connecticut 029098, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Eileen Elizabeth O'Regan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 029098 CT
Self-reported in NPPES; status is on the state search - Practice location
- 1781 Highland Ave, Cheshire, CT 06410
- Phone
- (203) 272-1990
- Enumerated
- Nov 20, 2006
- Record last updated
- Aug 14, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (203) 271-0668
- Medicaid ID
- 1290981 CT
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 1781 Highland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Eileen Elizabeth O'Regan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 029098Check 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 internal medicine physician in 2024
23 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Metoprolol Tartrate15 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.
Eileen Elizabeth O'Regan among 2,623 internal medicine physician records in Connecticut
Eileen Elizabeth O'Regan, MD is one of 2,623 internal medicine 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 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 52% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2008 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 internal medicine physician records list a practice address in Cheshire
They are 17 of the 757 NPPES records with a practice address in Cheshire, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Cheshire → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Erin Cardon, MDCheshire, CT 064101538233291
- Kevin Carr, M.D.Cheshire, CT 064101366556292
- Brian Cohen, D.O.Cheshire, CT 064101386826790
- Alicia Dodson, M.D.Cheshire, CT 064101396954764
- Benish Hussain, MDCheshire, CT 064101649579814
- Josh Mosdale, M.D.Cheshire, CT 064101528486875
- Dennis Pilarczyk, M.D.Cheshire, CT 064101568434199
- James Sarfeh, M.D.Cheshire, CT 064101235154410
Common questions
What is Eileen Elizabeth O'Regan, MD's NPI number?
Eileen Elizabeth O'Regan, MD's National Provider Identifier (NPI) is 1932273299, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Eileen Elizabeth O'Regan, MD located?
The NPPES record lists a practice address at 1781 Highland Ave, Cheshire, CT, 06410. Phone: (203) 272-1990. Providers update this record themselves, so call before visiting.
How can I verify Eileen Elizabeth O'Regan, MD's license?
NPPES lists Connecticut license number 029098, 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 Eileen Elizabeth O'Regan, MD prescribe under Medicare Part D?
In 2024, Eileen Elizabeth O'Regan, MD had 23 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.