Peter Haan Johnson, M.D.
Hematology & Oncology Physician · Waukesha, WI
Peter Haan Johnson, M.D. is a hematology & oncology physician with a practice address in Waukesha, Wisconsin, and NPI 1407948763, issued on Sep 28, 2006. Check the license on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Peter Haan Johnson
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- L8751 TX
Self-reported in NPPES; status is on the state search - Practice location
- 721 American Ave Ste 108, Waukesha, WI 53188
- Phone
- (262) 928-5350
- Enumerated
- Sep 28, 2006
- Record last updated
- Jan 20, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid ID
- 176675001 TX
- Medicare enrollment
- Enrolled (PECOS I20070814000189); accepts Medicare assignment
- Medical or professional school
- University Of Kentucky College Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 295 in Wisconsin → Look up another NPI →
Also registered at 721 American Ave Ste 108
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Tatyana Gerachshenko, MD,PHDPhysical Medicine & Rehabilitation Physician1629324736
- Barbara Hughes, NPFamily Nurse Practitioner1457911265
- Laura Raftery, M.D.Hematology & Oncology Physician1992862551
Verify Peter Haan Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,040 Medicare Part D claims for 253 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims. 27 claims were for opioids.
Most prescribed
- Letrozole131 claims
- Exemestane112 claims
- Eliquis107 claims
- Prochlorperazine Maleate79 claims
- Anastrozole76 claims
- Hydroxyurea42 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): 75.8 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
- Columbia St Marys Hospital Milwaukee IncMequon, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter Haan Johnson among 295 hematology & oncology physician records in Wisconsin
Peter Haan Johnson, M.D. 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
- Graduated2001 · median 2004 among the 217 with a school on file
- Record last updated2012 · 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 Waukesha → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Christopher Hake, MDWaukesha, WI 531881871544619
- Kathleen Hemauer, M.D.Waukesha, WI 531881326467234
- Jonathan Kapke, DOWaukesha, WI 531881093058372
- Laura Raftery, M.D.Waukesha, WI 531881992862551
- Mohammad Raza, M.D.Waukesha, WI 531881952585788
- Federico Sanchez, M.D.Waukesha, WI 531881396710836
- Derek Serna, M.D.Waukesha, WI 531881205044773
- Timothy Wassenaar, MDWaukesha, WI 531881518928993
Common questions
What is Peter Haan Johnson, M.D.'s NPI number?
Peter Haan Johnson, M.D.'s National Provider Identifier (NPI) is 1407948763, issued on Sep 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter Haan Johnson, M.D. located?
The NPPES record lists a practice address at 721 American Ave Ste 108, Waukesha, WI, 53188. Phone: (262) 928-5350. Providers update this record themselves, so call before visiting.
How can I verify Peter Haan Johnson, M.D.'s license?
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 Peter Haan Johnson, M.D. prescribe under Medicare Part D?
In 2024, Peter Haan Johnson, M.D. had 1,040 Medicare Part D claims for 253 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Peter Haan Johnson, M.D.'s MIPS final score?
The 2023 MIPS final score is 75.8 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.