Karen Thornburg, MD
NPI 1003938119 · Internal Medicine Physician · Muskegon, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Thornburg, MD is a Internal Medicine Physician provider in Muskegon, MI (NPI 1003938119).
Provider details
- NPI number
- 1003938119
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 4301087767 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
107 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Hemoglobin A1c Level83036 | 74 | $10 |
| Blood Glucose (sugar) Level82947 | 33 | $4 |
Typical Medicare-allowed amounts for these services range $4–$10 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 124 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 422 | 146 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 287 | 47 |
| Amlodipine Besylate | 240 | 77 |
| Omeprazole | 207 | 64 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 164 | 75 |
| Losartan Potassium | 161 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$107 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 2700 Baker St Fl 3Muskegon, MI 49444Phone: (231) 737-1335Fax: (231) 737-0534
Registry dates
- Enumerated
- 2007-04-06
- Last updated
- 2022-01-02
- Certified
- 2022-01-02
Frequently asked questions
- What is Karen Thornburg's NPI number?
- Karen Thornburg's National Provider Identifier (NPI) is 1003938119, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Thornburg's specialty?
- Karen Thornburg is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Thornburg located?
- Karen Thornburg's practice location on file with NPPES is 2700 Baker St Fl 3, Muskegon, MI 49444.
- What is Karen Thornburg's phone number?
- The practice phone number listed in the NPPES registry for Karen Thornburg is (231) 737-1335.
- Does Karen Thornburg accept Medicare?
- Karen Thornburg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Thornburg's NPI active?
- Yes — Karen Thornburg's NPI (1003938119) is active in the NPPES registry as of the last update on 2022-01-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.