Quick answers
- Does Gabrielle M. Karlsen accept Medicare assignment?
- Yes. Medicare's clinician data says Gabrielle M. Karlsen 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 Gabrielle M. Karlsen see?
- In 2024, CMS data shows 107 Original Medicare patients and 115 services for Gabrielle M. Karlsen. This counts Original Medicare only and measures volume, not quality.
- What is Gabrielle M. Karlsen's NPI number?
- 1437826641. 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 Gabrielle M. Karlsen, 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 | 107 |
|---|---|
| Services billed to Medicare | 115 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)88 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)14 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 cholesterol73%
- High blood pressure66%
- Anxiety39%
- Arthritis37%
- Diabetes31%
- Depression27%
Hospitals where Gabrielle M. Karlsen works
Medicare's Facility Affiliation Data lists Gabrielle M. Karlsen 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.
- F F Thompson HospitalCanandaigua, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330074
Practice locations
Addresses where Gabrielle M. Karlsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1160 Corporate DrFarmington, NY 14425 (585) 924‑1510
- 15 Canandaigua StShortsville, NY 14548 (585) 289‑3560
- 699 S Main St, Suite 5Canandaigua, NY 14424
- 800 W Miller St, Suite 11Newark, NY 14513 (315) 226‑8900
Group practices
Medicare enrollment lists Gabrielle M. Karlsen as a member of this group (CMS data updated October 2, 2026).
- The Frederick Ferris Thompson Hospital230 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Farmington
Clinicians with the same Medicare primary specialty in Farmington, NY — not a recommendation.
Other clinicians in The Frederick Ferris Thompson Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437826641 |
| 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