MARISSA LORENA WALCZAK FNP-BC
NPI 1871291906
Nurse Practitioner - Family in Rice Lake, WI
About Marissa Lorena Walczak Fnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARISSA LORENA WALCZAK FNP-BC (NPI 1871291906) is an individual family provider in Rice Lake, Wisconsin, licensed in Wisconsin (13864-33) and active in the NPI registry since February 2023. She is enrolled in Medicare PECOS, is affiliated with Marshfield Medical Center - Rice Lake, and is a graduate of Other (2022).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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 Lorena Walczak Fnp-bc 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
7Medicare enrollment records show Marissa Walczak reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rice Lake, WI 54868
- Reassigned Medicare billing, Wisconsin enrollment
- 1,616 clinicians in this Medicare group
Ladysmith, WI 54848
- Reassigned Medicare billing, Wisconsin enrollment
- 2,476 clinicians in this Medicare group
Ladysmith, WI 54848
- Reassigned Medicare billing, Wisconsin enrollment
- 97 clinicians in this Medicare group
Park Falls, WI 54552
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1700963048 (Wisconsin)
- 1,351 clinicians in this Medicare group
Neillsville, WI 54456
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1346239373 (Wisconsin)
- 1,440 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Waupun, WI 53963
- Reassigned Medicare billing, Wisconsin enrollment
- 1,447 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.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Marshfield Medical Center - Rice Lake
Acute Care Hospitals · Rice Lake, WIMarshfield Medical Center - Eau Claire
Acute Care Hospitals · Eau Claire, WIMarshfield Medical Center - Minocqua
Acute Care Hospitals · Minocqua, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54868 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 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Walczak's NPI number?
The NPI number for Marissa Walczak is 1871291906. It was assigned to this individual provider in the NPPES registry on February 17, 2023.
Where is Marissa Walczak located?
Marissa Walczak practices at 2900 S Wisconsin Ave, Rice Lake, WI 54868. The listed phone number is (715) 997-3915.
What is Marissa Walczak's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Marissa Walczak enrolled in Medicare?
Yes. Marissa Walczak 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 Walczak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Walczak reassigns Medicare benefits to 7 organizations: Lakeview Medical Center Inc Of Rice Lake (Rice Lake, WI), Mchs Hospitals Inc (Ladysmith, WI), Oakleaf Clinics Inc (Ladysmith, WI), Flambeau Hospital Inc (Park Falls, WI), Memorial Hospital Inc (Neillsville, WI) and 2 more organizations, listed in the Medicare section above. 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 Walczak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marissa Walczak accept?
Health plans from Dean Health Plan and HealthPartners list Marissa Walczak as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Marissa Walczak affiliated with any hospitals?
According to CMS data, Marissa Walczak is affiliated with Marshfield Medical Center - Rice Lake, Marshfield Medical Center - Eau Claire and Marshfield Medical Center - Minocqua.
When was this NPI record last updated?
The NPPES record for Marissa Walczak was last updated on September 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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 Lorena Walczak, FNP-BC · NPI 1871291906
Family physician in Rice Lake, Wisconsin. Individual provider, active in the CMS NPPES registry since February 17, 2023.
## Identity
- **NPI:** 1871291906 (Entity type: Individual)
- **Enumerated:** February 17, 2023
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 13864-33 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 2900 S WISCONSIN AVE, Rice Lake, WI 54868-8578
- **Phone:** (715) 997-3915
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Lakeview Medical Center Inc Of Rice Lake (NPI 1790320687, Rice Lake, WI); Mchs Hospitals Inc (NPI 1952890873, Ladysmith, WI); Oakleaf Clinics Inc (NPI 1669238754, Ladysmith, WI); Flambeau Hospital Inc (NPI 1194317966, Park Falls, WI); Memorial Hospital Inc (NPI 1033701800, Neillsville, WI); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** September 2, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1871291906) · Data from the CMS NPPES public registry.