Dr. Zachary Peter Hamersma, MD
- Medicare services, 2024
- 299
- Medicare patients, 2024
- 281
- Part D claims, 2024
- 383
- MIPS score, 2024
- 97
- Hospital affiliations
- 2
- Practice address
- One N Atkinson Drive, Ludington, MI 49431
- Practice phone
- Call (231) 843-2591
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hamersma's professional email, personal email and mobile number
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Dr. Zachary Peter Hamersma is an emergency medicine physician in Ludington, Michigan
Dr. Hamersma practices at Corewell Health Ludington Hospital in Ludington, Michigan, part of Corewell Health.
Dr. Hamersma's NPI, 1245725217, was assigned on June 22, 2018. Dr. Hamersma graduated from Michigan State University College of Human Medicine in 2018. Dr. Hamersma holds Michigan license 4301115550.
- NPI
- 1245725217NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9931453974
- NPI enumeration date
- June 22, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (231) 843-2591
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Zachary Peter Hamersma practices at 2 locations in Ludington, Michigan
Dr. Hamersma's primary practice is Corewell Health Ludington Hospital, at One N Atkinson Drive, Ludington, MI 49431 in Mason County. The practice phone is (231) 843-2591. Dr. Hamersma also practices at Spectrum Health Ludington Hospital, 1 Atkinson Dr, Ludington, MI 49431.
- Corewell Health Ludington HospitalPrimaryOne N Atkinson Drive, Ludington, MI 49431 · Mason CountyPhone(231) 843-2591
- Spectrum Health Ludington Hospital1 Atkinson Dr, Ludington, MI 49431 · Mason CountyPhone(231) 843-2591
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Zachary Peter Hamersma is affiliated with 2 sites of care and 3 medical groups
Dr. Hamersma's primary practice is Corewell Health Ludington Hospital in Ludington, Michigan, part of Corewell Health. Dr. Hamersma is also affiliated with Corewell Health Grand Rapids Hospitals - Butterworth. The medical group on file is Emergency Care Specialists (ECS). Dmand AI also links Dr. Hamersma to 2 more medical groups, 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. Zachary Peter Hamersma's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hamersma practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Corewell Health Ludington Hospital | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Zachary Peter Hamersma is one of 2,045 emergency medicine physicians in Michigan
Emergency medicine is Dr. Hamersma's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Hamersma is licensed in Michigan.
Specialties and state licenses
- Emergency medicine, MichiganPrimary
Emergency medicine physicians near Dr. Hamersma
Counts of emergency medicine physicians 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. Zachary Peter Hamersma billed Medicare for 299 services in 2024
CMS data shows 299 Medicare services from Dr. Hamersma across 4 procedure codes in 2024, for 281 Medicare patients. Medicare paid $37,396 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Hamersma's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3982024: 29925%
Dr. Hamersma compared with the Michigan median for emergency medicine physicians, 2024
- Dr. Hamersma
- Michigan median
- Medicare services
- 299vs 23428% above
- Medicare patients
- 281vs 21431% above
- Part D claims
- 241vs 465.2 times
Medians across 1,937 emergency medicine physicians in Michigan with Dmand AI profiles that report each measure.
Dr. Hamersma'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. Hamersma and other emergency medicine physicians in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Zachary Peter Hamersma treated 281 Medicare patients in 2024, average age 74
CMS counts 281 Medicare patients who saw Dr. Hamersma in 2024. The largest group is 75 to 84, with 94 patients. 75% of them have high blood pressure, and 72% have high cholesterol. 28% are also on Medicaid. Their average risk score is 1.78, 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. Hamersma's median patient age at 52, with 56% women.
Dr. Hamersma's Medicare patients by age, 2024
Dr. Hamersma's Medicare patients by sex, 2024
- Women14853%
- Men13347%
Chronic conditions among Dr. Hamersma's Medicare patients, 2024
- High blood pressure75%
- High cholesterol72%
- Arthritis59%
- Mood disorders42%
- Depression37%
- Ischemic heart disease37%
- Anxiety36%
- Heart failure36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hamersma's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Zachary Peter Hamersma wrote 383 Medicare Part D claims in 2024
In 2024, Dr. Hamersma wrote 383 Medicare Part D claims for 267 patients. 95% of them were for generic drugs. CMS names the drug for 241 of them, across 10 drugs with 11 or more claims each, at $1,128 in total drug cost. In 2023, CMS named 369 claims across 11 drugs.
Dr. Hamersma's Part D claims by kind of drug, 2024
- Generic363 claims95%
- Brand-name and other20 claims5%
Dr. Hamersma'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.
Drug classes CMS tracks in Dr. Hamersma's Part D claims, 2024
- Opioids7%27 of 383 claims
- Antibiotics33%127 of 383 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3692024: 24135%
Drugs named by CMS: 10 in 2024, 11 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. Zachary Peter Hamersma scored 97 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for Dr. Hamersma for performance year 2024, reported as part of a group. Dr. Hamersma accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Hamersma's MIPS scores, performance year 2024
- 97of 100Final score
- 89.3of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
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. Zachary Peter Hamersma received $53 in industry payments from 2022 to 2025
CMS Open Payments shows 2 general payments to Dr. Hamersma from 2 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $27.
General payments to Dr. Hamersma by program year, 2022 to 2025
Companies that paid Dr. Hamersma the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Zachary Peter Hamersma graduated from Michigan State University College of Human Medicine
Dr. Hamersma graduated from Michigan State University College of Human Medicine in 2018.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Zachary Peter Hamersma'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice 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. Zachary Peter Hamersma
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. Zachary Peter Hamersma's NPI number?
Dr. Zachary Peter Hamersma's NPI number is 1245725217. It was assigned on June 22, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Zachary Peter Hamersma?
Dr. Zachary Peter Hamersma is an emergency medicine physician in Ludington, Michigan. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Zachary Peter Hamersma practice?
Dr. Hamersma practices at One N Atkinson Drive, Ludington, MI 49431. Dr. Hamersma also practices at 1 Atkinson Dr, Ludington, MI 49431. Dr. Hamersma's primary practice is Corewell Health Ludington Hospital in Ludington, Michigan, part of Corewell Health. Dmand AI also links Dr. Hamersma to 2 medical groups.
What is Dr. Zachary Peter Hamersma's office phone number?
The practice phone on file for Dr. Hamersma is (231) 843-2591.
What is Dr. Zachary Peter Hamersma's medical license number?
Dr. Hamersma holds Michigan license 4301115550.
Which hospitals is Dr. Zachary Peter Hamersma affiliated with?
Dr. Hamersma practices at Corewell Health Ludington Hospital in Ludington, Michigan. Dr. Hamersma is also affiliated with Corewell Health Grand Rapids Hospitals - Butterworth.
What medical group is Dr. Zachary Peter Hamersma part of?
Dr. Hamersma is linked to Emergency Care Specialists (ECS). Dmand AI links Dr. Hamersma to 2 more medical groups.
Does Dr. Zachary Peter Hamersma accept Medicare?
Yes. CMS data shows Dr. Hamersma billed Medicare for 299 services in 2024, and Dr. Hamersma accepts Medicare assignment.
What is Dr. Zachary Peter Hamersma's MIPS score?
Dr. Hamersma's MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.
How many Medicare patients does Dr. Zachary Peter Hamersma see?
CMS counts 281 Medicare patients who saw Dr. Hamersma in 2024, with an average age of 74.
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What services does Dr. Zachary Peter Hamersma bill to Medicare?
In 2024, Dr. Hamersma's most billed Medicare services were emergency department visit (99284), emergency department visit (99285) and critical care (99291).
Where did Dr. Zachary Peter Hamersma go to medical school?
Dr. Hamersma graduated from Michigan State University College of Human Medicine in 2018.
What drugs does Dr. Zachary Peter Hamersma prescribe most?
In 2024 Medicare Part D data, Dr. Hamersma's most prescribed drugs by claims were Methocarbamol, Prednisone and Cephalexin.
Has Dr. Zachary Peter Hamersma received payments from drug or device companies?
CMS Open Payments shows $53 in general payments to Dr. Hamersma from 2 companies from 2022 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Zachary Peter Hamersma been practicing?
Dr. Hamersma graduated from medical school in 2018, 8 years ago.
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