John Joseph Hennessey, M.D.
Internal Medicine Physician · Gales Ferry, CT
John Joseph Hennessey, M.D. is an internal medicine physician with a practice address in Gales Ferry, Connecticut, and NPI 1215916564, issued on Jan 14, 2006. Check the license (Connecticut 037592, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John Joseph Hennessey
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 037592 CT
Self-reported in NPPES; status is on the state search - Practice location
- 1527 Route 12, Gales Ferry, CT 06335
- Phone
- (860) 464-7253
- Enumerated
- Jan 14, 2006
- Record last updated
- Nov 30, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (860) 464-7404
- Medicaid ID
- 001375923 CT
- Medicare enrollment
- Enrolled (PECOS I20100902000771); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1996
- Entity
- Type 1 · individual
Also registered at 1527 Route 12
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Steven Dias, DDSPediatric Dentistry1053772335
- Charles Esposito, M.D.Pediatrics Physician1548359078
- Steven Forstein, M.D.Pediatrics Physician1922197482
Verify John Joseph Hennessey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 037592Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.1 times the Medicare Part D claims of the average internal medicine physician in 2024
16,154 Medicare Part D claims for 1,053 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 282 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,306 claims
- Amlodipine Besylate647 claims
- Lisinopril610 claims
- Levothyroxine Sodium493 claims
- Eliquis458 claims
- Losartan Potassium420 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.
Industry payments in 2024: $1,517.13
59 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Gales Ferry Medical Group LLCGales Ferry, CT
- Ptsma IncPawcatuck, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
2 internal medicine physician records list a practice address in Gales Ferry
They are 2 of the 61 NPPES records with a practice address in Gales Ferry, and 2,623 internal medicine physician records in Connecticut.
All 2 in Gales Ferry → All 2,623 in Connecticut → Every provider in Gales Ferry →
Other internal medicine physician records in Connecticut
- Hoda Abdel Salam, M.D.New Britain, CT1144509316
- Gada Abdelhafiz, MDNew London, CT1467649558
- Racha Abi Melhem, MDDerby, CT1902471352
- Gerard Abidor, D.O.Bridgeport, CT1518014539
- Lilyan AbrahamFarmington, CT1447693254
- Richard Abraham, M.D.Canton, CT1023044252
- Odaliz Abreu-Lanfranco, MDNew Haven, CT1538276134
- Kenneth Abriola, MDGlastonbury, CT1083693022
- Florentino Abueg, MDSouthbury, CT1649372558
- Nila Aburto, MDStamford, CT1396325718
Common questions
What is John Joseph Hennessey, M.D.'s NPI number?
John Joseph Hennessey, M.D.'s National Provider Identifier (NPI) is 1215916564, issued on Jan 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Joseph Hennessey, M.D. located?
The NPPES record lists a practice address at 1527 Route 12, Gales Ferry, CT, 06335. Phone: (860) 464-7253. Providers update this record themselves, so call before visiting.
How can I verify John Joseph Hennessey, M.D.'s license?
NPPES lists Connecticut license number 037592, 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 Joseph Hennessey, M.D. prescribe under Medicare Part D?
In 2024, John Joseph Hennessey, M.D. had 16,154 Medicare Part D claims for 1,053 beneficiaries; 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.