Quick answers
- Does James C. Nielsen accept Medicare assignment?
- Yes. Medicare's clinician data says James C. Nielsen 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.
- What is James C. Nielsen's NPI number?
- 1669432266. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James C. Nielsen works
Medicare's Facility Affiliation Data lists James C. Nielsen 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.
- NYU Langone HospitalsNew York, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330214
Practice locations
Addresses where James C. Nielsen is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 111 BroadwayNew York, NY 10006 (212) 263‑9700
- 150 E 32nd StNew York, NY 10016 (212) 263‑3049
- 400 E 34th StNew York, NY 10016 (212) 263‑7300
- 530 1st AveNew York, NY 10016 (212) 263‑7300
- 550 1st AveNew York, NY 10016 (212) 263‑7300
Group practices
Medicare enrollment lists James C. Nielsen as a member of this group (CMS data updated October 2, 2026).
- New York University6,134 clinicians in the group
Specialties
Other pediatricians in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in New York University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tulane University School Of Medicine |
| Graduation year | 1995 (31 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669432266 |
| 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
- 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