NPPES file of Aug 9, 2026

John Martin Magenau, M.D.

Hematology (Internal Medicine) Physician · Ann Arbor, MI

John Martin Magenau, M.D. is a hematology (internal medicine) physician with a practice address in Ann Arbor, Michigan, and NPI 1285833954, issued on Jul 13, 2007. Check the license (Michigan 4301089502, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1285833954
Name
John Martin Magenau
Credential
M.D.
Primary taxonomy
Hematology (Internal Medicine) Physician 207RH0000X
License number
4301089502 MI
Self-reported in NPPES; status is on the state search
Practice location
1500 E Medical Center Dr, Ann Arbor, MI 48109
Phone
(734) 936-4000
Enumerated
Jul 13, 2007
Record last updated
Nov 23, 2020 (not updated in 6 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20101108000230); accepts Medicare assignment
Medical or professional school
Temple University School Of Medicine, 2004
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest hematology (internal medicine) physician records → All 57 in Michigan → Look up another NPI →

Also registered at 1500 E Medical Center Dr

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Bryan Aaron, MDObstetrics & Gynecology Physician1578307724
  2. Keith Aaronson, MDAdvanced Heart Failure and Transplant Cardiology Physician1144305301
  3. Rajani Aatre, M.S., M.SC.Genetic Counselor (M.S.)1962122457
  4. Anjelica Abate, MDDiagnostic Radiology Physician1841819216
  5. Nicole Abbott, CRNACertified Registered Nurse Anesthetist1790329860
  6. Ahmed Abdel-Latif, M.D.Interventional Cardiology Physician1518181239

Verify John Martin Magenau in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
    Search for license 4301089502    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Michigan license search

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36% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024

318 Medicare Part D claims for 38 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.

  1. John Magenau318
  2. Specialty average496

Most prescribed

  1. Acyclovir30 claims
  2. Prednisone28 claims
  3. Hydrocortisone26 claims
  4. Fluconazole18 claims
  5. Budesonide Dr13 claims
  6. Jakafi12 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 one group practice

  1. Regents OF The University OF MichiganAnn Arbor, MI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

John Martin Magenau among 57 hematology (internal medicine) physician records in Michigan

John Martin Magenau, M.D. is one of 57 hematology (internal medicine) physician records with a practice address in Michigan. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 39% of them.

  • NPI issued2007 · 39% of these records are older, 51% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 79% of these records are
  • Graduated2004 · median 2007 among the 45 with a school on file
  • Record last updated2020 · 46% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology (Internal Medicine) Physician providers in Michigan

There are 57 hematology (internal medicine) physician records in Michigan.

All 57 in Michigan → Every provider in Ann Arbor → Hematology (Internal Medicine) Physician nationwide →

The 8 hematology (internal medicine) physician records with the nearest ZIP codes

  1. Asra Ahmed, MDAnn Arbor, MI 481091013093079
  2. Dale Bixby, MDAnn Arbor, MI 481091952423816
  3. Paula Bockenstedt, MDAnn Arbor, MI 481091366528325
  4. Erica Campagnaro, MDAnn Arbor, MI 481091891854683
  5. Mark Chiang, MDAnn Arbor, MI 481091720034986
  6. Alice Cusick, M.D.Ann Arbor, MI 481091407824154
  7. Michael Deininger, MDAnn Arbor, MI 481091932115524
  8. Jennifer Griggs, MD, MPHAnn Arbor, MI 481091700949609

Common questions

What is John Martin Magenau, M.D.'s NPI number?

John Martin Magenau, M.D.'s National Provider Identifier (NPI) is 1285833954, issued on Jul 13, 2007. An NPI identifies a provider in billing; it is not a license.

Where is John Martin Magenau, M.D. located?

The NPPES record lists a practice address at 1500 E Medical Center Dr, Ann Arbor, MI, 48109. Phone: (734) 936-4000. Providers update this record themselves, so call before visiting.

How can I verify John Martin Magenau, M.D.'s license?

NPPES lists Michigan license number 4301089502, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does John Martin Magenau, M.D. prescribe under Medicare Part D?

In 2024, John Martin Magenau, M.D. had 318 Medicare Part D claims for 38 beneficiaries; the average among hematology (internal medicine) physician prescribers was 496. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.