Marcus Johannes Geer, MD
Hematology (Internal Medicine) Physician · Ann Arbor, MI
Marcus Johannes Geer, MD is a hematology (internal medicine) physician with a practice address in Ann Arbor, Michigan, and NPI 1164872537, issued on Jun 16, 2016. Check the license (Michigan 4301117307, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Marcus Johannes Geer
- Credential
- MD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- 4301117307 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
- Jun 16, 2016
- Record last updated
- Aug 1, 2023
- Medicare enrollment
- Enrolled (PECOS I20230803003147); accepts Medicare assignment
- Medical or professional school
- University Of Toledo College Of Medicine, 2016
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
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.
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Verify Marcus Johannes Geer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301117307Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
209 Medicare Part D claims for 39 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D.
Most prescribed
- Acyclovir23 claims
- Sulfamethoxazole-Trimethoprim20 claims
- Levofloxacin12 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.
Industry payments in 2024: $60.00
1 payment: food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 721 providers of this specialty with any payment received $13,778.35 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
- 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).
Marcus Johannes Geer among 57 hematology (internal medicine) physician records in Michigan
Marcus Johannes Geer, MD 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 2016, is newer than 88% of them.
- NPI issued2016 · 88% of these records are older, 7% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated2016 · median 2007 among the 45 with a school on file
- Record last updated2023 · 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
- Asra Ahmed, MDAnn Arbor, MI 481091013093079
- Dale Bixby, MDAnn Arbor, MI 481091952423816
- Paula Bockenstedt, MDAnn Arbor, MI 481091366528325
- Erica Campagnaro, MDAnn Arbor, MI 481091891854683
- Mark Chiang, MDAnn Arbor, MI 481091720034986
- Alice Cusick, M.D.Ann Arbor, MI 481091407824154
- Michael Deininger, MDAnn Arbor, MI 481091932115524
- Jennifer Griggs, MD, MPHAnn Arbor, MI 481091700949609
Common questions
What is Marcus Johannes Geer, MD's NPI number?
Marcus Johannes Geer, MD's National Provider Identifier (NPI) is 1164872537, issued on Jun 16, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Marcus Johannes Geer, MD 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 Marcus Johannes Geer, MD's license?
NPPES lists Michigan license number 4301117307, 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 Marcus Johannes Geer, MD prescribe under Medicare Part D?
In 2024, Marcus Johannes Geer, MD had 209 Medicare Part D claims for 39 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.
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.