Karen A. Thornburg, MD
Internal Medicine Physician · Muskegon, MI
Karen A. Thornburg, MD is an internal medicine physician with a practice address in Muskegon, Michigan, and NPI 1003938119, issued on Apr 6, 2007. Check the license (Michigan 4301087767, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Karen A. Thornburg
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301087767 MI
Self-reported in NPPES; status is on the state search - Practice location
- 2700 Baker St FL 3, Muskegon, MI 49444
- Phone
- (231) 737-1335
- Enumerated
- Apr 6, 2007
- Record last updated
- Jan 2, 2022
- Fax
- (231) 737-0534
- Medicaid ID
- 1003938119 MI
- Medicare enrollment
- Enrolled (PECOS I20090811000328); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 2700 Baker St FL 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kathleen Benton, RDRegistered Dietitian1487780086
- Ryan Busch, PA-CPhysician Assistant1619414984
- Allison Bush, MS LLPPsychologist1891929345
- Anne Cunningham, RDHDental Hygienist1154109510
- Deborah Dancz, BSWCommunity Health Worker1093584989
- Gabriel Devivo, DOFamily Medicine Physician1457989428
Verify Karen A. Thornburg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301087767Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,766 Medicare Part D claims for 379 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 395 claims were for opioids.
Most prescribed
- Atorvastatin Calcium422 claims
- Hydrocodone-Acetaminophen287 claims
- Amlodipine Besylate240 claims
- Omeprazole207 claims
- Albuterol Sulfate Hfa164 claims
- Losartan Potassium161 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.
Industry payments in 2024: $106.78
7 payments; by number, the most common kind was food and beverage; the largest payer was Supernus Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Hackley Community Care Center IncMuskegon, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen A. Thornburg among 5,735 internal medicine physician records in Michigan
Karen A. Thornburg, MD is one of 5,735 internal medicine 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 52% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2005 · median 2006 among the 3,564 with a school on file
- Record last updated2022 · 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 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 internal medicine physician records list a practice address in Muskegon
They are 47 of the 2,646 NPPES records with a practice address in Muskegon, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Muskegon → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael Bergquist, DOMuskegon, MI 494441174570303
- Wayne Brenneman, M.D.Muskegon, MI 494441346228913
- Don Campbell, MDMuskegon, MI 494441184601957
- Amy Dean, D.O.Muskegon, MI 494441982615357
- Dennis Desimone, DOMuskegon, MI 494441467468934
- Daniel Farrell, M.D.Norton Shores, MI 494441336144260
- James Grace, MDMuskegon, MI 494441215914023
- Hikmat Halasa, MDMuskegon, MI 494441386735447
Common questions
What is Karen A. Thornburg, MD's NPI number?
Karen A. Thornburg, MD's National Provider Identifier (NPI) is 1003938119, issued on Apr 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen A. Thornburg, MD located?
The NPPES record lists a practice address at 2700 Baker St FL 3, Muskegon, MI, 49444. Phone: (231) 737-1335. Providers update this record themselves, so call before visiting.
How can I verify Karen A. Thornburg, MD's license?
NPPES lists Michigan license number 4301087767, 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 Karen A. Thornburg, MD prescribe under Medicare Part D?
In 2024, Karen A. Thornburg, MD had 6,766 Medicare Part D claims for 379 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.