Quick answers
- Does Margaret C. Sewell accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret C. Sewell 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 Margaret C. Sewell see?
- In 2024, CMS data shows 76 Original Medicare patients and 820 services for Margaret C. Sewell. This counts Original Medicare only and measures volume, not quality.
- What is Margaret C. Sewell's NPI number?
- 1952331522. 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 Margaret C. Sewell, 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 | 76 |
|---|---|
| Services billed to Medicare | 820 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Evaluation of neuropsychological test, each additional hour (96133)325 services
- Administration of psychological or neuropsychological test, each additional 30 minutes (96137)257 services
- Evaluation of neuropsychological test, first hour (96132)75 services
- Administration of psychological or neuropsychological test, first 30 minutes (96136)75 services
- Psychiatric diagnostic evaluation (90791)43 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 cholesterol75%
- High blood pressure68%
- Arthritis54%
- Depression47%
- Anxiety45%
- Ischemic heart disease32%
Practice locations
Addresses where Margaret C. Sewell is enrolled with Medicare (CMS data updated October 2, 2026).
- 1425 Madison AveNew York, NY 10029 (212) 824‑8150
- 1440 Madison AveNew York, NY 10029 (212) 824‑8150
- 1450 Madison Ave, Suite 906New York, NY 10029 (212) 824‑8150
Group practices
Medicare enrollment lists Margaret C. Sewell as a member of this group (CMS data updated October 2, 2026).
- Icahn School of Medicine at Mount Sinai2,843 clinicians in the group
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in Icahn School of Medicine at Mount Sinai
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CP |
|---|---|
| Graduation year | 1996 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1952331522 |
| 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