Richard S. Zelkowitz, M.D.
Hematology & Oncology Physician · Norwalk, CT
Richard S. Zelkowitz, M.D. is a hematology & oncology physician with a practice address in Norwalk, Connecticut, and NPI 1891780805, issued on Sep 15, 2005. Check the license (Connecticut 029798, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Richard S. Zelkowitz
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 029798 CT
Self-reported in NPPES; status is on the state search - Practice location
- 40 Cross St, Norwalk, CT 06851
- Phone
- (203) 845-4890
- Enumerated
- Sep 15, 2005
- Record last updated
- Apr 12, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (203) 845-4897
- Medicaid ID
- 001297987 CT
- Medicare enrollment
- Enrolled (PECOS I20100511000364); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 1983
- 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 40 Cross St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jaclyn Conelius, NPNurse Practitioner1821095613
Verify Richard S. Zelkowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 029798Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
725 Medicare Part D claims for 184 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Anastrozole251 claims
- Exemestane74 claims
- Verzenio74 claims
- Letrozole72 claims
- Risedronate Sodium39 claims
- Tamoxifen Citrate30 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): 84.5 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).
Industry payments in 2024: $4,628.55
21 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,560 providers of this specialty with any payment received $7,481.41 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
- Hartford Healthcare Medical Group Specialists PLLCBridgeport, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Richard S. Zelkowitz among 198 hematology & oncology physician records in Connecticut
Richard S. Zelkowitz, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1983 · median 2003 among the 139 with a school on file
- Record last updated2011 · 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 Norwalk → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Richard Frank, M.D.Norwalk, CT 068511174515803
- George Zahrah, MDNorwalk, CT 068511871587030
- Nicole Carreau, M.D.Norwalk, CT 068501104168962
- Lisa Phuong, D.O.Norwalk, CT 068501265826234
- Patrick Reville, MDNorwalk, CT 068501619404530
- Donald Boyd, M.D.Greenwich, CT 068311396826376
- Julie Gold, M.D.Greenwich, CT 068301992739742
- Ellen Gold, MDRidgefield, CT 068771942544077
Common questions
What is Richard S. Zelkowitz, M.D.'s NPI number?
Richard S. Zelkowitz, M.D.'s National Provider Identifier (NPI) is 1891780805, issued on Sep 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Richard S. Zelkowitz, M.D. located?
The NPPES record lists a practice address at 40 Cross St, Norwalk, CT, 06851. Phone: (203) 845-4890. Providers update this record themselves, so call before visiting.
How can I verify Richard S. Zelkowitz, M.D.'s license?
NPPES lists Connecticut license number 029798, 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 Richard S. Zelkowitz, M.D. prescribe under Medicare Part D?
In 2024, Richard S. Zelkowitz, M.D. had 725 Medicare Part D claims for 184 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Richard S. Zelkowitz, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.5 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.