Kathryn R. Leinhardt, M. D.
Internal Medicine Physician · New Haven, CT
Kathryn R. Leinhardt, M. D. is an internal medicine physician with a practice address in New Haven, Connecticut, and NPI 1558302513, issued on Jun 9, 2006. Check the license (Connecticut 038568, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Kathryn R. Leinhardt
- Credential
- M. D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 038568 CT
Self-reported in NPPES; status is on the state search - Practice location
- 55 Lock Street, New Haven, CT 06520
- Phone
- (203) 432-0076
- Enumerated
- Jun 9, 2006
- Record last updated
- Jun 23, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (203) 432-7289
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 55 Lock Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- William Aquila, PAPhysician Assistant1164463469
- David Arendt, ODOptometrist1497788764
- Thomas Brady, PA-CPhysician Assistant1447287826
- Joan Cho, MDEndocrinology, Diabetes & Metabolism Physician1942242490
- Elizabeth Cole, CNM, RNAdvanced Practice Midwife1306873161
- Christine Colton, MDDiagnostic Radiology Physician1942287396
Verify Kathryn R. Leinhardt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 038568Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,067 Medicare Part D claims for 292 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 20 claims were for opioids.
Most prescribed
- Atorvastatin Calcium208 claims
- Levothyroxine Sodium138 claims
- Rosuvastatin Calcium117 claims
- Amlodipine Besylate94 claims
- Metoprolol Succinate68 claims
- Losartan Potassium67 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).
Kathryn R. Leinhardt among 2,623 internal medicine physician records in Connecticut
Kathryn R. Leinhardt, M. D. 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 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).
329 internal medicine physician records list a practice address in New Haven
They are 329 of the 9,793 NPPES records with a practice address in New Haven, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in New Haven → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Judy Hlawitschka, MDNew Haven, CT 065201437190840
- Vanessa Jefferson, MSN, C-ANP, CDENew Haven, CT 065201093926784
- Moreson Kaplan, MDNew Haven, CT 065201538103601
- Una Makris, MDNew Haven, CT 065201417065954
- Elizabeth Muskin, MDNew Haven, CT 065201881694669
- John Toksoy, M. D.New Haven, CT 065201396773511
- Madeline Wilson, MDNew Haven, CT 065201871574152
- Areej Ali, MDNew Haven, CT 065191629654629
Common questions
What is Kathryn R. Leinhardt, M. D.'s NPI number?
Kathryn R. Leinhardt, M. D.'s National Provider Identifier (NPI) is 1558302513, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn R. Leinhardt, M. D. located?
The NPPES record lists a practice address at 55 Lock Street, New Haven, CT, 06520. Phone: (203) 432-0076. Providers update this record themselves, so call before visiting.
How can I verify Kathryn R. Leinhardt, M. D.'s license?
NPPES lists Connecticut license number 038568, 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 Kathryn R. Leinhardt, M. D. prescribe under Medicare Part D?
In 2024, Kathryn R. Leinhardt, M. D. had 2,067 Medicare Part D claims for 292 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Kathryn R. Leinhardt, 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.