MARISSA J KRZYZAN FNP
NPI 1205598521
Nurse Practitioner - Family in Buffalo, NY
About Marissa J Krzyzan Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARISSA J KRZYZAN FNP (NPI 1205598521) is an individual family provider in Buffalo, New York, licensed in New York (F347951-01) and active in the NPI registry since October 2021. She is enrolled in Medicare PECOS, is affiliated with Sisters Of Charity Hospital, and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Marissa J Krzyzan Fnp is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show Marissa Krzyzan reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Kenmore, NY 14217
- Reassigned Medicare billing, New York enrollment
- 38 clinicians in this Medicare group
Williamsville, NY 14221
- Reassigned Medicare billing, New York enrollment
- 195 clinicians in this Medicare group
Dunkirk, NY 14048
- Reassigned Medicare billing, New York enrollment
- 572 clinicians in this Medicare group
Liverpool, NY 13090
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Wellnow Urgent Care, P.C.
- 511 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Sisters Of Charity Hospital
Acute Care Hospitals · Buffalo, NYKenmore Mercy Hospital
Acute Care Hospitals · Kenmore, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14217 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
KENMORE, NY 14217
BUFFALO, NY 14217
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marissa Krzyzan's NPI number?
The NPI number for Marissa Krzyzan is 1205598521. It was assigned to this individual provider in the NPPES registry on October 13, 2021.
Where is Marissa Krzyzan located?
Marissa Krzyzan practices at 2950 Elmwood Ave, Buffalo, NY 14217. The listed phone number is (716) 447-6100.
What is Marissa Krzyzan's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Marissa Krzyzan enrolled in Medicare?
Yes. Marissa Krzyzan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Marissa Krzyzan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Krzyzan reassigns Medicare benefits to 4 organizations: Buffalo-Niagara Hospitalists LLC (Kenmore, NY), Buffalo Emergency Associates LLP (Williamsville, NY), General Physician, PC (Dunkirk, NY) and Wellnow Urgent Care, PC (Liverpool, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marissa Krzyzan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Marissa Krzyzan affiliated with any hospitals?
According to CMS data, Marissa Krzyzan is affiliated with Sisters Of Charity Hospital and Kenmore Mercy Hospital.
When was this NPI record last updated?
The NPPES record for Marissa Krzyzan was last updated on March 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Marissa J Krzyzan, FNP · NPI 1205598521
Family physician in Buffalo, New York. Individual provider, active in the CMS NPPES registry since October 13, 2021.
## Identity
- **NPI:** 1205598521 (Entity type: Individual)
- **Enumerated:** October 13, 2021
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** F347951-01 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 2950 ELMWOOD AVE, Buffalo, NY 14217-1390
- **Phone:** (716) 447-6100
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Buffalo-Niagara Hospitalists LLC (NPI 1871830208, Kenmore, NY); Buffalo Emergency Associates LLP (NPI 1508816521, Williamsville, NY); General Physician, PC (NPI 1093959322, Dunkirk, NY); Wellnow Urgent Care, PC (NPI 1669825162, Liverpool, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** March 6, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1205598521) · Data from the CMS NPPES public registry.