Kathleen Fenn, M.D.
Hematology & Oncology Physician · New Haven, CT
Kathleen Fenn, M.D. is a hematology & oncology physician with a practice address in New Haven, Connecticut, and NPI 1205255619, issued on Apr 14, 2014. Check the license (Connecticut 66492, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Kathleen Fenn
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 66492 CT
Self-reported in NPPES; status is on the state search - Practice location
- 333 Cedar St, New Haven, CT 06510
- Phone
- (203) 688-4242
- Enumerated
- Apr 14, 2014
- Record last updated
- Jul 17, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20201006000148); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 2014
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 198 in Connecticut → Look up another NPI →
Also registered at 333 Cedar St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kathleen Fenn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 66492Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,233 Medicare Part D claims for 274 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 29 claims were for opioids.
Most prescribed
- Anastrozole444 claims
- Tamoxifen Citrate87 claims
- Eliquis73 claims
- Prochlorperazine Maleate62 claims
- Gabapentin52 claims
- Ondansetron Odt38 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Yale UniversityTrumbull, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathleen Fenn among 198 hematology & oncology physician records in Connecticut
Kathleen Fenn, M.D. is one of 198 hematology & oncology physician records with a practice address in Connecticut. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 79% of them.
- NPI issued2014 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2014 · median 2003 among the 139 with a school on file
- Record last updated2020 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Connecticut
There are 198 hematology & oncology physician records in Connecticut.
All 198 in Connecticut → Every provider in New Haven → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Prajwal Boddu, M.D.New Haven, CT 065101205178621
- Michael Cecchini, MDNew Haven, CT 065101184999336
- Emily Collier, MDNew Haven, CT 065101295963387
- Erin Hofstatter, M.D.New Haven, CT 065101467484998
- Scott Huntington, M.D.New Haven, CT 065101982847588
- Iris Isufi, M.D.New Haven, CT 065101407021140
- Arthur Levy, MDNew Haven, CT 065101043251135
- Jyoti Malhotra, M.D, MPHNew Haven, CT 065101598932170
Common questions
What is Kathleen Fenn, M.D.'s NPI number?
Kathleen Fenn, M.D.'s National Provider Identifier (NPI) is 1205255619, issued on Apr 14, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Kathleen Fenn, M.D. located?
The NPPES record lists a practice address at 333 Cedar St, New Haven, CT, 06510. Phone: (203) 688-4242. Providers update this record themselves, so call before visiting.
How can I verify Kathleen Fenn, M.D.'s license?
NPPES lists Connecticut license number 66492, 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 Kathleen Fenn, M.D. prescribe under Medicare Part D?
In 2024, Kathleen Fenn, M.D. had 1,233 Medicare Part D claims for 274 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Kathleen Fenn, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.