Dr. Michael L. Mahacek, MD
- Medicare services, 2024
- 1,312
- Medicare patients, 2024
- 279
- Part D claims, 2024
- 154
- MIPS score, 2024
- 75
- Hospital affiliations
- 5
- Practice address
- 100 Michigan St NE, Grand Rapids, MI 49503
- Practice phone
- Call (616) 391-1774
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Mahacek's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Michael L. Mahacek is a radiation oncologist in Grand Rapids, Michigan
Dr. Mahacek practices at Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan, part of Corewell Health.
Dr. Mahacek's NPI, 1922021484, was assigned on July 25, 2006. Dr. Mahacek graduated from Michigan State University College of Human Medicine in 1988. Dr. Mahacek holds Michigan license 053126.
- NPI
- 1922021484NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840181970
- NPI enumeration date
- July 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (616) 391-1774
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael L. Mahacek practices at Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan
Dr. Mahacek's primary practice is Corewell Health Grand Rapids Hospitals - Butterworth, at 100 Michigan St NE, Grand Rapids, MI 49503 in Kent County. The practice phone is (616) 391-1774.
- Corewell Health Grand Rapids Hospitals - Butterworth100 Michigan St NE, Grand Rapids, MI 49503 · Kent CountyPhone(616) 391-1774
Source: Dmand AI Affiliation Data
Dr. Michael L. Mahacek is affiliated with 5 sites of care and 1 medical group
Dr. Mahacek's primary practice is Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan, part of Corewell Health. Dr. Mahacek is also affiliated with Corewell Health Greenville Hospital. The medical group on file is Radiation Oncology Centers. Dmand AI also links Dr. Mahacek to 3 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael L. Mahacek's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mahacek practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Corewell Health Grand Rapids Hospitals - Butterworth | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael L. Mahacek is one of 200 radiation oncologists in Michigan
Radiation oncology is Dr. Mahacek's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Mahacek is licensed in Michigan.
Specialties and state licenses
- Radiation oncology, MichiganPrimary
Radiation oncologists near Dr. Mahacek
Counts of radiation oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael L. Mahacek billed Medicare for 1,312 services in 2024
CMS data shows 1,312 Medicare services from Dr. Mahacek across 15 procedure codes in 2024, for 279 Medicare patients. Medicare paid $81,921 for them.
Dr. Mahacek's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 1,0272024: 1,18615%
- Office and hospital visits
- 2023: 882024: 7811%
- Other services
- 2023: 492024: 482%
Where Dr. Mahacek's Medicare services took place, 2024
- In an office32225%
- In a facility99075%
Dr. Mahacek compared with the Michigan median for radiation oncologists, 2024
- Dr. Mahacek
- Michigan median
- Medicare services
- 1,312vs 1,14814% above
- Medicare patients
- 279vs 1332.1 times
- Part D claims
- 114vs 383.0 times
Medians across 184 radiation oncologists in Michigan with Dmand AI profiles that report each measure.
Dr. Mahacek's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mahacek and other radiation oncologists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael L. Mahacek treated 279 Medicare patients in 2024, average age 73
CMS counts 279 Medicare patients who saw Dr. Mahacek in 2024. The largest group is 65 to 74, with 144 patients. 75% of them have cancer, and 75% have high cholesterol. 13% are also on Medicaid. Their average risk score is 1.59, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Mahacek's median patient age at 69, with 44% women.
Dr. Mahacek's Medicare patients by age, 2024
Dr. Mahacek's Medicare patients by sex, 2024
- Women12244%
- Men15756%
Chronic conditions among Dr. Mahacek's Medicare patients, 2024
- Cancer75%
- High cholesterol75%
- High blood pressure71%
- Arthritis46%
- Anxiety33%
- Diabetes28%
- Ischemic heart disease25%
- Mood disorders24%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mahacek's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women44%
- Men56%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael L. Mahacek wrote 154 Medicare Part D claims in 2024
In 2024, Dr. Mahacek wrote 154 Medicare Part D claims for 69 patients. 96% of them were for generic drugs. CMS names the drug for 114 of them, across 2 drugs with 11 or more claims each, at $2,703 in total drug cost. In 2023, CMS named 152 claims across 2 drugs.
Dr. Mahacek's Part D claims by kind of drug, 2024
- Generic148 claims96%
- Brand-name and other6 claims4%
Dr. Mahacek's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1522024: 11425%
Drugs named by CMS: 2 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Michael L. Mahacek scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Mahacek for performance year 2024, reported as part of a group. Dr. Mahacek accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Mahacek as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- MIPS final score, 2024
- 75 of 100
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Michael L. Mahacek received $405 in industry payments from 2016 to 2025
CMS Open Payments shows 11 general payments to Dr. Mahacek from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Covidien LP paid the most, $183.
General payments to Dr. Mahacek by program year, 2016 to 2025
Companies that paid Dr. Mahacek the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael L. Mahacek graduated from Michigan State University College of Human Medicine
Dr. Mahacek graduated from Michigan State University College of Human Medicine in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael L. Mahacek's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael L. Mahacek
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael L. Mahacek's NPI number?
Dr. Michael L. Mahacek's NPI number is 1922021484. It was assigned on July 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael L. Mahacek?
Dr. Michael L. Mahacek is a radiation oncologist in Grand Rapids, Michigan. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Michael L. Mahacek practice?
Dr. Mahacek practices at 100 Michigan St NE, Grand Rapids, MI 49503. Dr. Mahacek's primary practice is Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan, part of Corewell Health. Dmand AI also links Dr. Mahacek to 3 hospitals.
What is Dr. Michael L. Mahacek's office phone number?
The practice phone on file for Dr. Mahacek is (616) 391-1774.
What is Dr. Michael L. Mahacek's medical license number?
Dr. Mahacek holds Michigan license 053126.
Which hospitals is Dr. Michael L. Mahacek affiliated with?
Dr. Mahacek practices at Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan. Dr. Mahacek is also affiliated with Corewell Health Greenville Hospital. Dmand AI links Dr. Mahacek to 3 more hospitals.
What medical group is Dr. Michael L. Mahacek part of?
Dr. Mahacek is linked to Radiation Oncology Centers.
Does Dr. Michael L. Mahacek accept Medicare?
Yes. CMS data shows Dr. Mahacek billed Medicare for 1,312 services in 2024, and Dr. Mahacek accepts Medicare assignment.
Does Dr. Michael L. Mahacek offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Mahacek as offering telehealth services.
What is Dr. Michael L. Mahacek's MIPS score?
Dr. Mahacek's MIPS final score for performance year 2024 is 75 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Michael L. Mahacek see?
CMS counts 279 Medicare patients who saw Dr. Mahacek in 2024, with an average age of 73.
What services does Dr. Michael L. Mahacek bill to Medicare?
In 2024, Dr. Mahacek's most billed Medicare services were radiation oncology (77014), radiation oncology (77300) and radiation oncology (77427).
Where did Dr. Michael L. Mahacek go to medical school?
Dr. Mahacek graduated from Michigan State University College of Human Medicine in 1988.
What drugs does Dr. Michael L. Mahacek prescribe most?
In 2024 Medicare Part D data, Dr. Mahacek's most prescribed drugs by claims were Tamsulosin HCl and Oxybutynin Chloride ER.
Has Dr. Michael L. Mahacek received payments from drug or device companies?
CMS Open Payments shows $405 in general payments to Dr. Mahacek from 9 companies from 2016 to 2025. The largest total came from Covidien LP.
How long has Dr. Michael L. Mahacek been practicing?
Dr. Mahacek graduated from medical school in 1988, 38 years ago.
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