Michael L. Mahacek, MD
Radiation Oncology Physician · Grand Rapids, MI
Michael L. Mahacek, MD is a radiation oncology physician with a practice address in Grand Rapids, Michigan, and NPI 1922021484, issued on Jul 25, 2006. Check the license (Michigan 053126, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Michael L. Mahacek
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 053126 MI
Self-reported in NPPES; status is on the state search - Practice location
- 100 Michigan St NE, Grand Rapids, MI 49503
- Phone
- (616) 391-1830
- Enumerated
- Jul 25, 2006
- Record last updated
- Dec 9, 2025
- Fax
- (616) 391-1286
- Medicaid ID
- 2933716 MI
- Medicare enrollment
- Enrolled (PECOS I20100604001158); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Human Medicine, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 239 in Michigan → Look up another NPI →
Also registered at 100 Michigan St NE
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Michael L. Mahacek in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 053126Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% more Medicare Part D claims than the average radiation oncology physician in 2024
154 Medicare Part D claims for 69 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl101 claims
- Oxybutynin Chloride Er13 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $22.71
1 payment: food and beverage; the largest payer was Sumitomo Pharma America, Inc. The 3,275 providers of this specialty with any payment received $1,897.85 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
- Radiation Oncology Centers PCHolland, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael L. Mahacek among 239 radiation oncology physician records in Michigan
Michael L. Mahacek, MD is one of 239 radiation oncology physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 55% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1988 · median 2005 among the 172 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Michigan
There are 239 radiation oncology physician records in Michigan.
All 239 in Michigan → Every provider in Grand Rapids → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Joshua Corteville, MDGrand Rapids, MI 495031093203457
- John Edlund, MDGrand Rapids, MI 495031841215878
- Celine Eid, MDGrand Rapids, MI 495031447047774
- Patrick Fabrizio, MDGrand Rapids, MI 495031356350938
- Anudeeta Gautam, MDGrand Rapids, MI 495031699562017
- Robert Kirkland, MDGrand Rapids, MI 495031578940029
- Brandon Mancini, M.D.Grand Rapids, MI 495031366731838
- Caroline Oska, M.D.Grand Rapids, MI 495031952006736
Common questions
What is Michael L. Mahacek, MD's NPI number?
Michael L. Mahacek, MD's National Provider Identifier (NPI) is 1922021484, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael L. Mahacek, MD located?
The NPPES record lists a practice address at 100 Michigan St NE, Grand Rapids, MI, 49503. Phone: (616) 391-1830. Providers update this record themselves, so call before visiting.
How can I verify Michael L. Mahacek, MD's license?
NPPES lists Michigan license number 053126, 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 Michael L. Mahacek, MD prescribe under Medicare Part D?
In 2024, Michael L. Mahacek, MD had 154 Medicare Part D claims for 69 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Michael L. Mahacek, MD's MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.