Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Karen A Thornburg, MD

Individual provider Internal Medicine Physician · NPI 1003938119

Dr. Karen A Thornburg, MD practises Internal Medicine in Muskegon, Michigan. Qualified in 2005, 21 years ago. Practices with Hackley Community Care Center Inc, an 18-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
21
Licensed in
MI
In the registry since
2007
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

2700 Baker St Fl 3
Muskegon, MI 49444
Phone: (231) 737-1335
Fax: (231) 737-0534
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 2700 Baker St Fl 3, Muskegon, MI 49444 — (231) 737-1335

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 4301087767 (MI)

Record details

NPI number1003938119
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 6, 2007
Last updated in NPPESJanuary 2, 2022
Certification dateJanuary 2, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Hackley Community Care Center Inc — 18 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients60
Services billed 150 a service is one billed item, such as a visit, a test or a procedure
Average patient age62

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.

Food and Beverage $74 5 payments · a meal or drink at a meeting or visit, not a fee

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.

  • Mercy Health Lakeshore Campus Hospital · Shelby, MI
  • Trinity Health Muskegon Hospital Hospital · Muskegon, MI
  • Trinity Health At Home - Muskegon Home health agency · Muskegon, MI

Colleagues at Hackley Community Care Center Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 18 clinicians in the practice; 12 are shown here.

Other providers in Muskegon