Karen S. Guadagnini, MD
Internal Medicine Physician · Bristol, CT
Karen S. Guadagnini, MD is an internal medicine physician with a practice address in Bristol, Connecticut, and NPI 1316934185, issued on Oct 5, 2005. Check the license (Connecticut 034917, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Karen S. Guadagnini
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 034917 CT
Self-reported in NPPES; status is on the state search - Practice location
- 102 North St, Bristol, CT 06010
- Phone
- (860) 314-2082
- Enumerated
- Oct 5, 2005
- Record last updated
- Feb 22, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (860) 314-8133
- Medicaid ID
- 001349176 CT
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 102 North St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vijay Joshi, MDEndocrinology, Diabetes & Metabolism Physician1174522692
- Saima Pasha, MDInternal Medicine Physician1932163292
- Margaret Weir, APRNAdult Health Nurse Practitioner1063408953
Verify Karen S. Guadagnini in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 034917Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
87 Medicare Part D claims for 23 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Clonidine Hcl12 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: $118.30
1 payment: food and beverage; the largest payer was Novo Nordisk 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.
Karen S. Guadagnini among 2,623 internal medicine physician records in Connecticut
Karen S. Guadagnini, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2011 · 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).
34 internal medicine physician records list a practice address in Bristol
They are 34 of the 854 NPPES records with a practice address in Bristol, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Bristol → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nadeem Behjet, M.D.Bristol, CT 060101114981701
- Nelson Bondhus, MDBristol, CT 060101245227586
- Stephen Caminiti, MDBristol, CT 060101144216045
- Yong-Sung Chyun, MDBristol, CT 060101417990268
- Oliver Diaz, M.D.Bristol, CT 060101124037312
- Howard Dubin, MDBristol, CT 060101972592848
- Yin Fei Hung, MDBristol, CT 060101588651822
- Laith Kasir, M.D.Bristol, CT 060101417900101
Common questions
What is Karen S. Guadagnini, MD's NPI number?
Karen S. Guadagnini, MD's National Provider Identifier (NPI) is 1316934185, issued on Oct 5, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Karen S. Guadagnini, MD located?
The NPPES record lists a practice address at 102 North St, Bristol, CT, 06010. Phone: (860) 314-2082. Providers update this record themselves, so call before visiting.
How can I verify Karen S. Guadagnini, MD's license?
NPPES lists Connecticut license number 034917, 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 Karen S. Guadagnini, MD prescribe under Medicare Part D?
In 2024, Karen S. Guadagnini, MD had 87 Medicare Part D claims for 23 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.