Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark A. Jonker, MD

Individual provider Surgery Physician · NPI 1780620039

Mark A. Jonker, MD practises General Surgery in Brighton, Michigan. Graduated from Medical College of Wisconsin in 2006, 20 years ago. Practices with Iha Health Services Corporation, a 1,146-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Massachusetts and Michigan.

Years since qualifying
20
Trained at
Medical College of Wisconsin
Licensed in
MA, MI
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2305 Genoa Business Park Dr Ste 120
Brighton, MI 48114
Phone: (810) 494-6881
Fax: (810) 494-6882
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 55 Lake Ave N, Worcester, MA 01655-0002 — (508) 334-0545
  • 55 Lake Ave N, Worcester, MA 01655-0002 — (508) 334-0545

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 4301108483 (MI)
Surgery Physician Taxonomy 208600000X · Licence 258991 (MA)

Record details

NPI number1780620039
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 22, 2006
Last updated in NPPESDecember 6, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL SURGERY
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2006 (20 years in practice)
Group practice Iha Health Services Corporation — 1146 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations7 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 1–10 times
Hernia repair (minimally invasive) 1–10 times
Upper gastrointestinal (GI) endoscopy for acid reflux 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients48
Services billed 92 a service is one billed item, such as a visit, a test or a procedure
Average patient age68

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Education $1,500 1 payment · educational material or training, not a fee
Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $500 1 payment

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Chelsea Hospital Hospital · Chelsea, MI · listed as Chelsea Community Hospital
  • Trinity Health Ann Arbor Hospital Hospital · Ann Arbor, MI · listed as Trinity Health Michigan Ann Arbor
  • Trinity Health Livingston Hospital Hospital · Howell, MI

Colleagues at Iha Health Services Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1146 clinicians in the practice; 12 are shown here.

Other providers in Brighton