Quick answers
- Does Marie Y. Pierrot accept Medicare assignment?
- Yes. Medicare's clinician data says Marie Y. Pierrot 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 Marie Y. Pierrot see?
- In 2024, CMS data shows 80 Original Medicare patients and 148 services for Marie Y. Pierrot. This counts Original Medicare only and measures volume, not quality.
- What is Marie Y. Pierrot's NPI number?
- 1457667958. 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 Marie Y. Pierrot, 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 | 80 |
|---|---|
| Services billed to Medicare | 148 |
| Different services or procedures | 18 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)45 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)41 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)20 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)12 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 pressure71%
- Arthritis45%
- Diabetes35%
- Chronic kidney disease31%
- Ischemic heart disease28%
Practice locations
Addresses where Marie Y. Pierrot is enrolled with Medicare (CMS data updated October 2, 2026).
- 518 E 20th StNew York, NY 10009 (646) 682‑3555
- 55 E 34th StNew York, NY 10016 (212) 252‑6131
Group practices
Medicare enrollment lists Marie Y. Pierrot 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
- Physician Assistantprimary
Other physician assistants 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
| Graduation year | 1994 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1457667958 |
| 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