Quick answers
- Does Susan J. Kostrzewski accept Medicare assignment?
- Yes. Medicare's clinician data says Susan J. Kostrzewski 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 Susan J. Kostrzewski see?
- In 2024, CMS data shows 29 Original Medicare patients and 506 services for Susan J. Kostrzewski. This counts Original Medicare only and measures volume, not quality.
- What is Susan J. Kostrzewski's NPI number?
- 1770058273. 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 Susan J. Kostrzewski, 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 | 29 |
|---|---|
| Services billed to Medicare | 506 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 63 |
Most frequent services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)283 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)156 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)51 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).
- Anxiety69%
- High blood pressure59%
- High cholesterol48%
- Depression45%
- Diabetes38%
- Arthritis38%
Practice locations
Addresses where Susan J. Kostrzewski is enrolled with Medicare (CMS data updated October 2, 2026).
- 36 Clinton StConcord, NH 03301 (603) 271‑5300
Group practices
Medicare enrollment lists Susan J. Kostrzewski as a member of this group (CMS data updated October 2, 2026).
- State of New Hampshire74 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Concord
Clinicians with the same Medicare primary specialty in Concord, NH — not a recommendation.
Other clinicians in State of New Hampshire
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2013 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1770058273 |
| 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