Michael L Mahacek, MD

Primary specialty

Radiation Oncology PhysicianTaxonomy code 2085R0001X

License

053126 Issued in MI

Practice address

100 Michigan St NE
Grand Rapids, MI 49503-2560

Phone

(616) 391-1830

Fax

(616) 391-1286

NPI assigned

Jul 25, 2006

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Other identifiers 2

Medicare fee-for-service enrollment

Enrolled in MI

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Radiation Oncology

Education

Michigan State University College of Human Medicine, 1988

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Radiation Oncology Centers PCGroup PAC ID 2860437092, 9 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Spectrum Health Hospital, Grand Rapids, MI, CCN 230038
• Corewell Health Reed City Hospital Hospital, Reed City, MI, CCN 231323
• Holland Hospital Hospital, Holland, MI, CCN 230072
• Corewell Health Pennock Hospital Hospital, Hastings, MI, CCN 231339
• Spectrum Health United Hospital Hospital, Greenville, MI, CCN 230035

Merit-based Incentive Payment System (MIPS)

Final score

75 of 100Reported as group

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Radiation Oncology Centers PC

  • Radiation Oncology Physician
  • Grand Rapids, MI
  • NPI 1073610713
  Medicare reassignment Care Compare group
• Lakeshore Area Radiation Oncology Center

  • Radiation Oncology Clinic/Center
  • Holland, MI
  • NPI 1295820900
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Holland Community Hospital

  • General Acute Care Hospital
  • Holland, MI
  • NPI 1871672618
  Care Compare affiliation
• Pennock Hospital

  • Critical Access Hospital
  • Hastings, MI
  • NPI 1932695525
  Care Compare affiliation
• Reed City Hospital Corporation

  • Critical Access Hospital
  • Reed City, MI
  • NPI 1437259843
  Care Compare affiliation
• Spectrum Health Hospitals

  • General Acute Care Hospital
  • Grand Rapids, MI
  • NPI 1922090554
  Care Compare affiliation
• Spectrum Health United

  • General Acute Care Hospital
  • Greenville, MI
  • NPI 1457304495
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1153785600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765238400000",
    "number": "1922021484",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "100 MICHIGAN ST NE",
            "city": "GRAND RAPIDS",
            "state": "MI",
            "postal_code": "495032560",
            "telephone_number": "616-391-1830",
            "fax_number": "616-391-1286"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 MICHIGAN ST NE",
            "city": "GRAND RAPIDS",
            "state": "MI",
            "postal_code": "495032560",
            "telephone_number": "616-391-1830",
            "fax_number": "616-391-1286"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "145 Michigan St NE Ste 1100",
            "address_purpose": "LOCATION",
            "city": "Grand Rapids",
            "state": "MI",
            "postal_code": "495032562",
            "country_code": "US",
            "telephone_number": "616-486-5750",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MAHACEK",
        "first_name": "MICHAEL",
        "middle_name": "L",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-25",
        "last_updated": "2025-12-09",
        "certification_date": "2025-12-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "MI",
            "license": "053126",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2933716",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "920001168",
            "state": "MI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Leah Jean Magnuson, NP
• Abbey Renee Magolan, PHARMD
• Gina Magri, LMSW
• Alexa Magsoudi, DO
• Jean Linda Maguire, LPC
• John Mahajan, MD
• Ali Mahajerin, M.D.
• Scott M Mahar, AUDIOLOGIST
• Prasha Maharjan
• Amar Jitin Mahbubani, D.O.

• Radiation Oncology Physician in Grand Rapids, MI
• Providers in Grand Rapids, MI by specialty
• Radiation Oncology Physician in Michigan

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 9, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.