John S. Wisniewski, MD
Internal Medicine Physician · Hartford, CT
John S. Wisniewski, MD is an internal medicine physician with a practice address in Hartford, Connecticut, and NPI 1689786568, issued on Aug 31, 2006. Check the license (Connecticut 046333, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John S. Wisniewski
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 046333 CT
Self-reported in NPPES; status is on the state search - Practice location
- 85 Seymour St, Hartford, CT 06106
- Phone
- (860) 241-0700
- Enumerated
- Aug 31, 2006
- Record last updated
- Jan 22, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (860) 525-7881
- Medicare enrollment
- Enrolled (PECOS I20080616000174); accepts Medicare assignment
- Medical or professional school
- State University Of Ny Upstate Medical University, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 85 Seymour St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Samuel Anyatonwu, MDInternal Medicine Physician1023028933
- Alan Armstrong, P.A.Physician Assistant1790761898
Verify John S. Wisniewski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 046333Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.3 times the Medicare Part D claims of the average internal medicine physician in 2024
13,733 Medicare Part D claims for 989 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 480 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,159 claims
- Amlodipine Besylate701 claims
- Rosuvastatin Calcium568 claims
- Levothyroxine Sodium481 claims
- Losartan Potassium347 claims
- Hydrochlorothiazide301 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: $98.47
5 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. 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 one group practice
- Starling Physicians, PLLCWethersfield, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John S. Wisniewski among 2,623 internal medicine physician records in Connecticut
John S. Wisniewski, 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 fileYes · 63% of these records are
- Graduated1995 · median 2004 among the 1,646 with a school on file
- Record last updated2010 · 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).
169 internal medicine physician records list a practice address in Hartford
They are 169 of the 6,317 NPPES records with a practice address in Hartford, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Hartford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Samuel Anyatonwu, MDHartford, CT 061061023028933
- Daniel Borrus, M.D.Hartford, CT 061061306023247
- Benjamin ChuHartford, CT 061061689848517
- Mary Colpoys, MDHartford, CT 061061104824275
- Aized Imtiaz, M.DHartford, CT 061061124212758
- Venkata Praveena Kota, MDHartford, CT 061061538362249
- William Laakso, MDHartford, CT 061061841399334
- Emilio Pandika, MDHartford, CT 061061851387518
Common questions
What is John S. Wisniewski, MD's NPI number?
John S. Wisniewski, MD's National Provider Identifier (NPI) is 1689786568, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John S. Wisniewski, MD located?
The NPPES record lists a practice address at 85 Seymour St, Hartford, CT, 06106. Phone: (860) 241-0700. Providers update this record themselves, so call before visiting.
How can I verify John S. Wisniewski, MD's license?
NPPES lists Connecticut license number 046333, 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 S. Wisniewski, MD prescribe under Medicare Part D?
In 2024, John S. Wisniewski, MD had 13,733 Medicare Part D claims for 989 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.