Quick answers
- Does Marissa Krzyzan accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa Krzyzan 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 Marissa Krzyzan see?
- In 2024, CMS data shows 76 Original Medicare patients and 86 services for Marissa Krzyzan. This counts Original Medicare only and measures volume, not quality.
- What is Marissa Krzyzan's NPI number?
- 1205598521. 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 Marissa Krzyzan, 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 | 76 |
|---|---|
| Services billed to Medicare | 86 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Emergency department visit with moderate level of medical decision making (99284)39 services
- Emergency department visit with high level of medical decision making (99285)18 services
- Emergency department visit with low level of medical decision making (99283)17 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 pressure70%
- Anxiety54%
- Arthritis51%
- Depression33%
- Ischemic heart disease32%
Hospitals where Marissa Krzyzan works
Medicare's Facility Affiliation Data lists Marissa Krzyzan 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.
- Kenmore Mercy HospitalKenmore, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330102
- Sisters of Charity HospitalBuffalo, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330078
Practice locations
Addresses where Marissa Krzyzan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1430 Colvin BlvdBuffalo, NY 14223 (716) 874‑4060
- 446 Fairview Ave, Suite 200Hudson, NY 12534 (518) 267‑3496
- 7375 Oswego Rd, Suite 1Liverpool, NY 13090 (315) 291‑0064
Group practices
Medicare enrollment lists Marissa Krzyzan as a member of these groups (CMS data updated October 2, 2026).
- General Physician PC501 clinicians in the group
- Wellnow Urgent Care, P.C.392 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Buffalo
Clinicians with the same Medicare primary specialty in Buffalo, NY — not a recommendation.
Other clinicians in General Physician PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1205598521 |
| 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