Quick answers
- Does Jeffrey P. Greenfield accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey P. Greenfield 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 P. Greenfield see?
- In 2024, CMS data shows 11 Original Medicare patients and 17 services for Jeffrey P. Greenfield. This counts Original Medicare only and measures volume, not quality.
- What is Jeffrey P. Greenfield's NPI number?
- 1790931814. 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 P. Greenfield, 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 | 11 |
|---|---|
| Services billed to Medicare | 17 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 61 |
Hospitals where Jeffrey P. Greenfield works
Medicare's Facility Affiliation Data lists Jeffrey P. Greenfield at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- New York-Presbyterian HospitalNew York, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330101
Practice locations
Addresses where Jeffrey P. Greenfield is enrolled with Medicare (CMS data updated October 2, 2026).
- 1305 York AveNew York, NY 10021
- 504 W 35th StNew York, NY 10001 (888) 922‑2257
- 520 E 70th StNew York, NY 10021 (646) 962‑2012
- 520 E 70th St, Suite 651New York, NY 10021 (212) 746‑6575
- 525 E 68th StNew York, NY 10065
Group practices
Medicare enrollment lists Jeffrey P. Greenfield as a member of this group (CMS data updated October 2, 2026).
- Weill Medical College of Cornell2,051 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in Weill Medical College of Cornell
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Medical school | Js Weill Medical College, Cornell University |
|---|---|
| Graduation year | 2002 (24 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) | 1790931814 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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