Quick answers
- Does Jeffrey I. Zwicker accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey I. Zwicker accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Jeffrey I. Zwicker see?
- In 2024, CMS data shows 139 Original Medicare patients and 231 services for Jeffrey I. Zwicker. This counts Original Medicare only and measures volume, not quality.
- What is Jeffrey I. Zwicker's NPI number?
- 1851330849. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Jeffrey I. Zwicker, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 139 |
|---|---|
| Services billed to Medicare | 231 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)68 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)35 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)21 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)20 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)18 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)60%
- Arthritis50%
- Diabetes40%
- Anxiety40%
Practice locations
Addresses where Jeffrey I. Zwicker is enrolled with Medicare (CMS data updated October 2, 2026).
- 1275 York AveNew York, NY 10065 (212) 639‑2000
Group practices
Medicare enrollment lists Jeffrey I. Zwicker as a member of this group (CMS data updated October 2, 2026).
- Memorial Hematology Lymphoma Group216 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in Memorial Hematology Lymphoma Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Pennsylvania State University College Of Medicine |
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1851330849 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians