John O. Thayer, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Hartford, CT
John O. Thayer, MD is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in Hartford, Connecticut, and NPI 1942293956, issued on Aug 24, 2005. Check the license (Connecticut 028081, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John O. Thayer
- Credential
- MD
- Primary taxonomy
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
- License number
- 028081 CT
Self-reported in NPPES; status is on the state search - Practice location
- 1000 Asylum Ave, Hartford, CT 06105
- Phone
- (860) 714-1094
- Enumerated
- Aug 24, 2005
- Record last updated
- Mar 30, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (860) 714-8850
- Medicaid ID
- 001280817 CT
- Entity
- Type 1 · individual
8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 79 in Connecticut → Look up another NPI →
Also registered at 1000 Asylum Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Swapnil Bagade, MDDiagnostic Radiology Physician1801100367
- Kristofer Bagdasarian, M.D.Surgery Physician1588848774
- Erik Bee, MDDiagnostic Radiology Physician1588807002
Verify John O. Thayer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 028081Check 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 thoracic surgery (cardiothoracic vascular surgery) physician in 2024
11 Medicare Part D claims, against an average of 101 among the 2,587 providers of this specialty who prescribed in Part D.
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.
John O. Thayer among 79 thoracic surgery (cardiothoracic vascular surgery) physician records in Connecticut
John O. Thayer, MD is one of 79 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in Connecticut. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 81% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2009 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208G00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in Connecticut
There are 79 thoracic surgery (cardiothoracic vascular surgery) physician records in Connecticut.
All 79 in Connecticut → Every provider in Hartford → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →
The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes
- Robert Gallagher, MDHartford, CT 061051801894829
- Jennifer Perri, M.D.Hartford, CT 061051487065801
- Whitney Burrows, M.D.Hartford, CT 061061205840444
- Jonathan Hammond, MDHartford, CT 061061235115965
- Sabet Hashim, MDHartford, CT 061061497719579
- Chester Humphrey, MDHartford, CT 061061891871448
- Robert Lowe, MDHartford, CT 061061447243951
- Dennis Mello, MDHartford, CT 061061962477497
Common questions
What is John O. Thayer, MD's NPI number?
John O. Thayer, MD's National Provider Identifier (NPI) is 1942293956, issued on Aug 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John O. Thayer, MD located?
The NPPES record lists a practice address at 1000 Asylum Ave, Hartford, CT, 06105. Phone: (860) 714-1094. Providers update this record themselves, so call before visiting.
How can I verify John O. Thayer, MD's license?
NPPES lists Connecticut license number 028081, 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 John O. Thayer, MD prescribe under Medicare Part D?
In 2024, John O. Thayer, MD had 11 Medicare Part D claims; the average among thoracic surgery (cardiothoracic vascular surgery) physician prescribers was 101. 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.