Marissa Walczak, FNP-BC
NPI 1871291906 · Family Nurse Practitioner · Rice Lake, WI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Walczak, FNP-BC is a Family Nurse Practitioner provider in Rice Lake, WI (NPI 1871291906).
Provider details
- NPI number
- 1871291906
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-BC
- Sex
- Female
- Sole proprietor
- No
- License
- 13864-33 (WI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Calcium Acetate | 54 | 25 |
| Midodrine Hcl | 51 | 14 |
| Amlodipine Besylate | 47 | 25 |
| Sevelamer Carbonate | 45 | 17 |
| Losartan Potassium | 37 | 11 |
| Calcitriol | 30 | 15 |
| Furosemide | 28 | — |
| Carvedilol | 17 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-02-17
- Last updated
- 2026-01-12
- Certified
- 2026-01-12
Frequently asked questions
- What is Marissa Walczak's NPI number?
- Marissa Walczak's National Provider Identifier (NPI) is 1871291906, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Walczak's specialty?
- Marissa Walczak is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marissa Walczak located?
- Marissa Walczak's practice location on file with NPPES is 2900 S Wisconsin Ave, Rice Lake, WI 54868-8578.
- What is Marissa Walczak's phone number?
- The practice phone number listed in the NPPES registry for Marissa Walczak is (715) 997-3915.
- Does Marissa Walczak accept Medicare?
- Marissa Walczak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Walczak's NPI active?
- Yes — Marissa Walczak's NPI (1871291906) is active in the NPPES registry as of the last update on 2026-01-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.