Quick answers
- Does Nathanael Marsan accept Medicare assignment?
- Yes. Medicare's clinician data says Nathanael Marsan 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 Nathanael Marsan see?
- In 2024, CMS data shows 401 Original Medicare patients and 462 services for Nathanael Marsan. This counts Original Medicare only and measures volume, not quality.
- What is Nathanael Marsan's NPI number?
- 1619331469. 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 Nathanael Marsan, 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 | 401 |
|---|---|
| Services billed to Medicare | 462 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Emergency department visit with high level of medical decision making (99285)199 services
- Emergency department visit with moderate level of medical decision making (99284)157 services
- Critical care, first 30-74 minutes (99291)51 services
- Emergency department visit with low level of medical decision making (99283)30 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%
- Arthritis56%
- Ischemic heart disease43%
- Depression41%
- Diabetes38%
Hospitals where Nathanael Marsan works
Medicare's Facility Affiliation Data lists Nathanael Marsan 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.
- Brattleboro Memorial HospitalBrattleboro, VT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 470011
- Montefiore Medical CenterBronx, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330059
- Montefiore Mount Vernon HospitalMount Vernon, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330086
- Putnam Hospital CenterCarmel, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330273
- Westchester Medical CenterValhalla, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330234
Practice locations
Addresses where Nathanael Marsan is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Woods RdValhalla, NY 10595 (914) 493‑5247
- 17 Belmont AveBrattleboro, VT 05301 (802) 257‑0341
- 2475 Saint Raymonds AveBronx, NY 10461 (718) 920‑4321
- 670 Stoneleigh AveCarmel, NY 10512 (845) 279‑5711
Group practices
Medicare enrollment lists Nathanael Marsan as a member of these groups (CMS data updated October 2, 2026).
- Bluewater Emergency Partners of Brunswick, LLC154 clinicians in the group
- Emergency Physician Services of New York, P.C.131 clinicians in the group
- Physicians Medical Associates New York PC102 clinicians in the group
- Hospitalist Medicine Physicians of New York PLLC36 clinicians in the group
- New York Physician Associates of Medicine PC17 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Valhalla
Clinicians with the same Medicare primary specialty in Valhalla, NY — not a recommendation.
Other clinicians in Bluewater Emergency Partners of Brunswick, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of Ny Upstate Medical University |
| Graduation year | 2016 (10 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1619331469 |
| 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