Keith Marcus, MD - Medicare Hospitalist in Ludington, MI

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Keith Marcus, MD is a medicare enrolled "Internal Medicine" physician in Ludington, Michigan. He went to University Of Iowa, Rj & L Carver College Of Medicine and graduated in 1985 and has 39 years of diverse experience with area of expertise as Hospitalist. He is a member of the group practice Spectrum Health Primary Care Partners, Sound Inpatient Physicians-michigan Pllc and his current practice location is 1 Atkinson Dr, Ludington, Michigan. You can reach out to his office (for appointments etc.) via phone at (616) 391-3139.

Keith Marcus is licensed to practice in Michigan (license number 4301050045) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1255371365.

Contact Information

Keith Marcus, MD
1 Atkinson Dr,
Ludington, MI 49431-1906
(616) 391-3139
Not Available

Map and Direction




Physician's Profile

Full NameKeith Marcus
GenderMale
SpecialityHospitalist
Experience39 Years
Location1 Atkinson Dr, Ludington, Michigan
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Keith Marcus attended and graduated from University Of Iowa, Rj & L Carver College Of Medicine in 1985
  NPI Data:
  • NPI Number: 1255371365
  • Provider Enumeration Date: 06/07/2006
  • Last Update Date: 03/01/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 0345259909
  • Enrollment ID: I20070919000668

Medical Identifiers

Medical identifiers for Keith Marcus such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1255371365NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 4301050045 (Michigan)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Spectrum Health Ludington HospitalLudington, MIHospital
Munson Healthcare Manistee HospitalManistee, MIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Spectrum Health Primary Care Partners45875686471590
Sound Inpatient Physicians-michigan Pllc5395896849201

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. Keith Marcus allows following entities to bill medicare on his behalf.
Entity NameSpectrum Health Primary Care Partners
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235188673
PECOS PAC ID: 4587568647
Enrollment ID: O20031121000091
Entity NameMercy Specialty Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629010384
PECOS PAC ID: 2365439544
Enrollment ID: O20040429000064
Entity NameHospitalist Medicine Physicians Of Michigan Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1013180181
PECOS PAC ID: 4486703170
Enrollment ID: O20090529000290
Entity NameSound Inpatient Physicians-michigan Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1639311996
PECOS PAC ID: 5395896849
Enrollment ID: O20090624000252
Entity NameHospitalist Medicine Physicians Of Michigan - Tcs Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1437794153
PECOS PAC ID: 9739517137
Enrollment ID: O20200318001589

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. Keith Marcus 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
Keith Marcus, MD
100 Michigan St Ne # Mc845,
Grand Rapids, MI 49503-2560

Ph: () -		Keith Marcus, MD
1 Atkinson Dr,
Ludington, MI 49431-1906

Ph: (616) 391-3139

Reviews and Comments


Internal Medicine Doctors in Ludington, MI

Dr. Catherine Marie Czesnowski, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1 Atkinson Dr, Ludington, MI 49431
Phone: 616-391-3139    
John Craig Persson, DO
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 5 Atkinson Drive, Ste #207, Ludington, MI 49431
Phone: 231-843-3600    Fax: 231-845-9887
Dr. Bryan Anthony Kovas, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7 Atkinson Dr, Ludington, MI 49431
Phone: 231-843-3487    
Ralph Avedisian, DO
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7 N Atkinson Dr, Suite 111, Ludington, MI 49431
Phone: 231-843-3487    
Zane M Knoer, DO
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7 Atkinson Dr, Ludington, MI 49431
Phone: 231-843-3487    
Dr. Joel Adoquaye Allotey, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 7 Atkinson Dr Ste 111, Ludington, MI 49431
Phone: 231-843-3487    

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.