Marcus Johannes Geer, MD - Medicare Internal Medicine in Ann Arbor, MI

Marcus Johannes Geer, MD is a medicare enrolled "Internal Medicine - Hematology" physician in Ann Arbor, Michigan. His current practice location is 1500 E Medical Center Dr, Ann Arbor, Michigan. You can reach out to his office (for appointments etc.) via phone at (734) 936-4000.

Marcus Johannes Geer is licensed to practice in Michigan (license number 4301117307) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1164872537.

Contact Information

Marcus Johannes Geer, MD
1500 E Medical Center Dr,
Ann Arbor, MI 48109-5000
(734) 936-4000
Not Available

Map and Direction




Physician's Profile

Full NameMarcus Johannes Geer
GenderMale
SpecialityInternal Medicine - Hematology
Location1500 E Medical Center Dr, Ann Arbor, Michigan
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1164872537
  • Provider Enumeration Date: 06/16/2016
  • Last Update Date: 08/01/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 0345535845
  • Enrollment ID: I20230803003147

Medical Identifiers

Medical identifiers for Marcus Johannes Geer such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1164872537NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0003XInternal Medicine - Hematology & Oncology 4301117307 (Michigan)Secondary
207RH0000XInternal Medicine - Hematology 4301117307 (Michigan)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Marcus Johannes Geer allows following entities to bill medicare on his behalf.
Entity NameRegents Of The University Of Michigan
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1205868353
PECOS PAC ID: 3779496856
Enrollment ID: O20031106000325

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Marcus Johannes Geer is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Marcus Johannes Geer, MD
3621 S State St,
Ann Arbor, MI 48108-1633

Ph: (734) 647-5299
Marcus Johannes Geer, MD
1500 E Medical Center Dr,
Ann Arbor, MI 48109-5000

Ph: (734) 936-4000

Reviews and Comments


Internal Medicine Doctors in Ann Arbor, MI

Nabil Alkhoury Fallouh, MD
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Dr. Aiman M Mahmood, M.D.
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Anastasia Irene Wasylyshyn, MD
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Anne Lewis Carlton,
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Practice Location: 1500 E Medical Center Dr, Ann Arbor, MI 48109
Phone: 734-647-5900    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.