Quick answers
- Does Marie-Anne M. Leinhaas accept Medicare assignment?
- Yes. Medicare's clinician data says Marie-Anne M. Leinhaas 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-Anne M. Leinhaas see?
- In 2024, CMS data shows 13 Original Medicare patients and 90 services for Marie-Anne M. Leinhaas. This counts Original Medicare only and measures volume, not quality.
- What is Marie-Anne M. Leinhaas's NPI number?
- 1437287638. 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-Anne M. Leinhaas, 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 | 13 |
|---|---|
| Services billed to Medicare | 90 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
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).
- Anxiety75%
Practice locations
Addresses where Marie-Anne M. Leinhaas is enrolled with Medicare (CMS data updated October 2, 2026).
- 1516 Atwood AveJohnston, RI 02919 (401) 553‑1000
- 4705 Old Post RdCharlestown, RI 02813
Group practices
Medicare enrollment lists Marie-Anne M. Leinhaas as a member of this group (CMS data updated October 2, 2026).
- Gateway Healthcare Inc65 clinicians in the group
Specialties
- Clinical Social Workerprimary
Find other clinicians: Clinical Social Worker, Rhode Island →
Other clinical social workers in Johnston
Clinicians with the same Medicare primary specialty in Johnston, RI — not a recommendation.
Other clinicians in Gateway Healthcare Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 1981 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437287638 |
| 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