Quick answers
- Does Sayaka Larsen accept Medicare assignment?
- Yes. Medicare's clinician data says Sayaka Larsen 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 Sayaka Larsen see?
- In 2024, CMS data shows 158 Original Medicare patients and 190 services for Sayaka Larsen. This counts Original Medicare only and measures volume, not quality.
- What is Sayaka Larsen's NPI number?
- 1184217283. 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 Sayaka Larsen, 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 | 158 |
|---|---|
| Services billed to Medicare | 190 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)104 services
- Programming of dual lead pacemaker system (93280)38 services
- Evaluation of cardiac rhythm monitor system (93291)13 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 blood pressure75%
- High cholesterol75%
- Atrial fibrillation75%
- Ischemic heart disease69%
- Arthritis50%
- Heart failure49%
Hospitals where Sayaka Larsen works
Medicare's Facility Affiliation Data lists Sayaka Larsen 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.
- Healthalliance Hospital Marys Avenue CampusKingston, NY · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 330224
- Westchester Medical CenterValhalla, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330234
Practice locations
Addresses where Sayaka Larsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 111 Marys Ave, Suite 3Kingston, NY 12401 (845) 339‑3663
- 117 Marys Ave, Suite 102Kingston, NY 12401 (845) 338‑5555
- 95 Grasslands RdValhalla, NY 10595 (914) 493‑6940
Group practices
Medicare enrollment lists Sayaka Larsen as a member of this group (CMS data updated October 2, 2026).
- Westchester Medical Center Advanced Physician Services PC897 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Kingston
Clinicians with the same Medicare primary specialty in Kingston, NY — not a recommendation.
Other clinicians in Westchester Medical Center Advanced Physician Services PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1184217283 |
| 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
- 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