Marissa Lorena Walczak, FNP-BC
Family Nurse Practitioner · Rice Lake, WI
Marissa Lorena Walczak, FNP-BC is a family nurse practitioner with a practice address in Rice Lake, Wisconsin, and NPI 1871291906, issued on Feb 17, 2023. Check the license (Wisconsin 13864-33, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marissa Lorena Walczak
- Credential
- FNP-BC
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 13864-33 WI
Self-reported in NPPES; status is on the state search - Practice location
- 2900 S Wisconsin Ave, Rice Lake, WI 54868
- Phone
- (715) 997-3915
- Enumerated
- Feb 17, 2023
- Record last updated
- Jan 12, 2026
- Medicare enrollment
- Enrolled (PECOS I20230628003265); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 2,814 in Wisconsin → Look up another NPI →
Also registered at 2900 S Wisconsin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kimberly Collymore, FNPFamily Nurse Practitioner1912110305
- Jamie Gohde, FNPFamily Nurse Practitioner1306434246
- Denise Kniprath, N.P.Family Nurse Practitioner1962436162
- Charles Meng, ODOptometrist1558477950
- Todd Swanson, ODOptometrist1063475879
Verify Marissa Lorena Walczak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 13864-33Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average family nurse practitioner in 2024
572 Medicare Part D claims for 121 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Calcium Acetate54 claims
- Midodrine Hcl51 claims
- Amlodipine Besylate47 claims
- Sevelamer Carbonate45 claims
- Losartan Potassium37 claims
- Calcitriol30 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 3 group practices
- Lakeview Medical Center Inc OF Rice LakeRice Lake, WI
- Mchs Hospitals IncMarshfield, WI
- Oakleaf Clinics IncRice Lake, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marissa Lorena Walczak among 2,814 family nurse practitioner records in Wisconsin
Marissa Lorena Walczak, FNP-BC is one of 2,814 family nurse practitioner records with a practice address in Wisconsin. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 78% of them.
- NPI issued2023 · 78% of these records are older, 15% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2022 · median 2019 among the 1,740 with a school on file
- Record last updated2026 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 family nurse practitioner records list a practice address in Rice Lake
They are 22 of the 401 NPPES records with a practice address in Rice Lake, and 2,814 family nurse practitioner records in Wisconsin.
All 2,814 in Wisconsin → Every provider in Rice Lake → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Kimberly Collymore, FNPRice Lake, WI 548681912110305
- Jamie Gohde, FNPRice Lake, WI 548681306434246
- Tracey Harris, DNPRice Lake, WI 548681447609540
- Roberta Herrick, APRNRice Lake, WI 548681386958676
- Kayla JennessRice Lake, WI 548681114578457
- Ashley JohnsonRice Lake, WI 548681598115537
- Denise Kniprath, N.P.Rice Lake, WI 548681962436162
- Elizabeth Marcoux, FNPRice Lake, WI 548681679079859
Common questions
What is Marissa Lorena Walczak, FNP-BC's NPI number?
Marissa Lorena Walczak, FNP-BC's National Provider Identifier (NPI) is 1871291906, issued on Feb 17, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Marissa Lorena Walczak, FNP-BC located?
The NPPES record lists a practice address at 2900 S Wisconsin Ave, Rice Lake, WI, 54868. Phone: (715) 997-3915. Providers update this record themselves, so call before visiting.
How can I verify Marissa Lorena Walczak, FNP-BC's license?
NPPES lists Wisconsin license number 13864-33, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Marissa Lorena Walczak, FNP-BC prescribe under Medicare Part D?
In 2024, Marissa Lorena Walczak, FNP-BC had 572 Medicare Part D claims for 121 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.