Dr. John C. Nelson, M.D.
Hematology (Hematology (Internal Medicine) Physician)
- Medicare participating
At a glance
- Medical school
- Harvard Medical School (1971)
- Years since graduation
- 55
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 261
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1971Medical school: Harvard Medical School
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Hematology (Internal Medicine) Physician primary
NY license 128109
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Westchester Medical Center Valhalla, NY
Medical groups
- Westchester Medical Center Advanced Physician Services PC (897 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 261
- Services billed
- 406
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 83 | 77 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 69 | 65 |
| Established patient office or other outpatient visit, 20-29 minutes | 63 | 48 |
| Established patient office or other outpatient visit, 30-39 minutes | 63 | 43 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 40 | 27 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 35 | 23 |
| New patient office or other outpatient visit, 45-59 minutes | 13 | 13 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Eliquis (apixaban) Other prescribers in Hawthorne, NY | 62 |
| Xarelto (rivaroxaban) Other prescribers in Hawthorne, NY | 47 |
| Hydroxyurea Other prescribers in Hawthorne, NY | 29 |
| Imbruvica (ibrutinib) | 12 |
| Prednisone Other prescribers in Hawthorne, NY | 11 |
| Warfarin Sodium Other prescribers in Hawthorne, NY | 11 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 1 companies reported 1 payments worth $23.14 in total to this clinician.
| Servier Pharmaceuticals LLC | $23.14 |
|---|
| Food and Beverage | $23.14 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.