Karen J. Leiser, MD
Internal Medicine Physician · Harrison, NY
Karen J. Leiser, MD is an internal medicine physician with a practice address in Harrison, New York, and NPI 1073689055, issued on Nov 28, 2006. Check the license (New York 232670, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Karen J. Leiser
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 232670 NY
Self-reported in NPPES; status is on the state search - Practice location
- 600 Mamaroneck Ave, Harrison, NY 10528
- Phone
- (914) 723-8100
- Enumerated
- Nov 28, 2006
- Record last updated
- Feb 10, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (914) 219-1928
- Medicare enrollment
- Enrolled (PECOS I20070928000094); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 2002
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 600 Mamaroneck Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Karen J. Leiser in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 232670Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,358 Medicare Part D claims for 252 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium359 claims
- Losartan Potassium209 claims
- Amlodipine Besylate175 claims
- Rosuvastatin Calcium147 claims
- Lisinopril104 claims
- Hydrochlorothiazide101 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): 99.2 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
- White Plains Physician Services PCHarrison, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen J. Leiser among 12,067 internal medicine physician records in New York
Karen J. Leiser, MD is one of 12,067 internal medicine physician records with a practice address in New York. 79% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2002 · median 2002 among the 7,221 with a school on file
- Record last updated2016 · 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 internal medicine physician records list a practice address in Harrison
They are 11 of the 713 NPPES records with a practice address in Harrison, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Harrison → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Amanda Benza, FNP-CHarrison, NY 105281326668583
- Priya ChavanHarrison, NY 105281396205266
- Daniel Colangelo, MDHarrison, NY 105281255496279
- Deborah Finkelstein, MDHarrison, NY 105281346377512
- David Goldberg, M.D.Harrison, NY 105281295751246
- Marney Gruber, M.D.Harrison, NY 105281083857601
- Deborah Hemel, M.D.Harrison, NY 105281396062717
- Jessica KennedyHarrison, NY 105281093456865
Common questions
What is Karen J. Leiser, MD's NPI number?
Karen J. Leiser, MD's National Provider Identifier (NPI) is 1073689055, issued on Nov 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen J. Leiser, MD located?
The NPPES record lists a practice address at 600 Mamaroneck Ave, Harrison, NY, 10528. Phone: (914) 723-8100. Providers update this record themselves, so call before visiting.
How can I verify Karen J. Leiser, MD's license?
NPPES lists New York license number 232670, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Karen J. Leiser, MD prescribe under Medicare Part D?
In 2024, Karen J. Leiser, MD had 2,358 Medicare Part D claims for 252 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Karen J. Leiser, MD's MIPS final score?
The 2023 MIPS final score is 99.2 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.