Walter L. Longo, MD
Hematology & Oncology Physician · Milwaukee, WI
Walter L. Longo, MD is a hematology & oncology physician with a practice address in Milwaukee, Wisconsin, and NPI 1629044649, issued on Feb 28, 2006. Check the license (Wisconsin 24712, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Walter L. Longo
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 24712 WI
Self-reported in NPPES; status is on the state search - Practice location
- 9200 W Wisconsin Ave, Milwaukee, WI 53226
- Phone
- (414) 805-4600
- Enumerated
- Feb 28, 2006
- Record last updated
- Aug 5, 2022
- Fax
- (414) 805-6805
- Medicaid ID
- 1629044649 WI
- Medicare enrollment
- Enrolled (PECOS I20060123000629); accepts Medicare assignment
- Medical or professional school
- University Of Nebraska College Of Medicine, 1977
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 295 in Wisconsin → Look up another NPI →
Also registered at 9200 W Wisconsin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shameem Aadam, RPHPharmacist1760755680
- Abubaker Abdalla, MDHospitalist Physician1194187617
- Sameem Abedin, MDHematology & Oncology Physician1063641157
- Lolia Abibo, M.D.Hospitalist Physician1912359795
- Haisam Abid, MBBSHospitalist Physician1578083184
- Faith Abodunrin, MDHematology & Oncology Physician1437768769
Verify Walter L. Longo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 24712Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
546 Medicare Part D claims for 79 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims. 48 claims were for opioids.
Most prescribed
- Acyclovir63 claims
- Sulfamethoxazole-Trimethoprim59 claims
- Fluconazole32 claims
- Eliquis27 claims
- Jakafi27 claims
- Oxycodone Hcl26 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): 80.5 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).
Bills Medicare through one group practice
- The Medical College OF Wisconsin IncNew Berlin, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter L. Longo among 295 hematology & oncology physician records in Wisconsin
Walter L. Longo, MD is one of 295 hematology & oncology physician records with a practice address in Wisconsin. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1977 · median 2004 among the 217 with a school on file
- Record last updated2022 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Wisconsin
There are 295 hematology & oncology physician records in Wisconsin.
All 295 in Wisconsin → Every provider in Milwaukee → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Yee Chung Cheng, MDMilwaukee, WI 532261811948318
- Christopher Chitambar, MDMilwaukee, WI 532261215987748
- William Drobyski, MDMilwaukee, WI 532261861443848
- Amy Harker-Murray, MDMilwaukee, WI 532261760459663
- Peiman Hematti, MDMilwaukee, WI 532261710953732
- Joel Lundberg, MDMilwaukee, WI 532261306827621
- William Matthaeus, MDMilwaukee, WI 532261326039074
- Mark Moskowitz, MDMilwaukee, WI 532261295718815
Common questions
What is Walter L. Longo, MD's NPI number?
Walter L. Longo, MD's National Provider Identifier (NPI) is 1629044649, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter L. Longo, MD located?
The NPPES record lists a practice address at 9200 W Wisconsin Ave, Milwaukee, WI, 53226. Phone: (414) 805-4600. Providers update this record themselves, so call before visiting.
How can I verify Walter L. Longo, MD's license?
NPPES lists Wisconsin license number 24712, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Walter L. Longo, MD prescribe under Medicare Part D?
In 2024, Walter L. Longo, MD had 546 Medicare Part D claims for 79 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Walter L. Longo, MD's MIPS final score?
The 2023 MIPS final score is 80.5 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.