Nancy L. Lassa, RN
Nurse Practitioner · Wauwatosa, WI
Nancy L. Lassa, RN is a nurse practitioner with a practice address in Wauwatosa, Wisconsin, and NPI 1487808598, issued on Nov 17, 2008. Check the license (Wisconsin 5507-33, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Nancy L. Lassa
- Credential
- RN
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- 5507-33 WI
115274-030 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1155 N Mayfair RD, Wauwatosa, WI 53226
- Phone
- (414) 955-5990
- Enumerated
- Nov 17, 2008
- Record last updated
- Oct 31, 2024
- Fax
- (149) 554-6282
- Medicaid ID
- 1487808598 WI
- Medicare enrollment
- Enrolled (PECOS I20131114000187); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 3,995 in Wisconsin → Look up another NPI →
Also registered at 1155 N Mayfair RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Margaret Abraham, PHDClinical Psychologist1053194407
- Matthew Albinger, DOFamily Medicine Physician1649920307
- Abigayle Andrews, PA-CPhysician Assistant1417471962
- Abby Angelroth, PHARMDPharmacist1407428279
- Cassandra Bell, P.A.Physician Assistant1265486120
- Delaney Bowling, NPFamily Nurse Practitioner1427717966
Verify Nancy L. Lassa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 5507-33Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.3 times the Medicare Part D claims of the average nurse practitioner in 2024
4,725 Medicare Part D claims for 524 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 2,959 claims were for opioids.
Most prescribed
- Oxycodone Hcl660 claims
- Hydrocodone-Acetaminophen615 claims
- Oxycodone-Acetaminophen430 claims
- Gabapentin317 claims
- Tizanidine Hcl284 claims
- Morphine Sulfate Er255 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $160.40
6 payments; by number, the most common kind was food and beverage; the largest payer was Nevro Corp. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Medical College OF Wisconsin IncMilwaukee, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy L. Lassa among 3,995 nurse practitioner records in Wisconsin
Nancy L. Lassa, RN is one of 3,995 nurse practitioner records with a practice address in Wisconsin. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 23% of them.
- NPI issued2008 · 23% of these records are older, 74% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2013 · median 2017 among the 2,701 with a school on file
- Record last updated2024 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
56 nurse practitioner records list a practice address in Wauwatosa
They are 56 of the 1,787 NPPES records with a practice address in Wauwatosa, and 3,995 nurse practitioner records in Wisconsin.
All 3,995 in Wisconsin → Every provider in Wauwatosa → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Judith Fox, APNPMilwaukee, WI 532261821040569
- Katherine Grochowski, NPMilwaukee, WI 532261821049644
- Helen Kim, APNPMilwaukee, WI 532261972554715
- Elizabeth Krzywda, NPMilwaukee, WI 532261316999139
- Linda Marker, APNPMilwaukee, WI 532261386696029
- Angela Paul, NPWauwatosa, WI 532261215993555
- Alexandra Pieper, APNPWauwatosa, WI 532261700888930
- Judith Podoll, APNPMilwaukee, WI 532261366494098
Common questions
What is Nancy L. Lassa, RN's NPI number?
Nancy L. Lassa, RN's National Provider Identifier (NPI) is 1487808598, issued on Nov 17, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Nancy L. Lassa, RN located?
The NPPES record lists a practice address at 1155 N Mayfair RD, Wauwatosa, WI, 53226. Phone: (414) 955-5990. Providers update this record themselves, so call before visiting.
How can I verify Nancy L. Lassa, RN's license?
NPPES lists Wisconsin license number 5507-33, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Nancy L. Lassa, RN prescribe under Medicare Part D?
In 2024, Nancy L. Lassa, RN had 4,725 Medicare Part D claims for 524 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
What is Nancy L. Lassa, RN's MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.