Quick answers
- Does Marie Dy-Guillaume accept Medicare assignment?
- Yes. Medicare's clinician data says Marie Dy-Guillaume 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 Dy-Guillaume see?
- In 2024, CMS data shows 15 Original Medicare patients and 86 services for Marie Dy-Guillaume. This counts Original Medicare only and measures volume, not quality.
- What is Marie Dy-Guillaume's NPI number?
- 1538123922. 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 Dy-Guillaume, 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 | 15 |
|---|---|
| Services billed to Medicare | 86 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)22 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 pressure73%
Practice locations
Addresses where Marie Dy-Guillaume is enrolled with Medicare (CMS data updated October 2, 2026).
- 87 -08 Justice Ave, Suite CsElmhurst, NY 11373 (718) 779‑9599
Group practices
Medicare enrollment lists Marie Dy-Guillaume as a member of this group (CMS data updated October 2, 2026).
- Medical Associates, P.C.2 clinicians in the group
Specialties
- Internal Medicineprimary
- Infectious Diseasealso
Other internal medicine doctors in Elmhurst
Clinicians with the same Medicare primary specialty in Elmhurst, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538123922 |
| 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