Physician

John K Bartnik, M.D.

According to 2025 Medicare claims, John Bartnik, M.D. (NPI: 1740211275) practices hematology/oncology in the Saginaw, MI market, with the plurality of this provider's patient population coming from Saginaw, MI. This provider's primary affiliated billing organization is ONCOLOGY HEMATOLOGY ASSOCIATES OF SAGINAW VALLEY PC (NPI: 1366472169; TIN: 383553403) and primary practice location at 48604-9533. Bartnik is affiliated with the POM ACO (ACO ID: A1297), McLaren High Performance Network, LLC (ACO ID: A3317), Mosaic ACO (ACO ID: A5033), Aledade 155 National MSSP (ACO ID: A5358), and Collaborative ACO 30, LLC (ACO ID: A5483), participating under the MSSP model.

Bartnik's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 416 traditional Medicare patients, billed 64,707 HCPCS/CPT codes, and received $1,150,484 in Medicare payments. The top billing code was 99204 (New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more). Part D data shows 1,410 prescription claims across 303 beneficiaries totaling $5,967,607 in drug costs, led by Revlimid (Lenalidomide). 2020 DME data shows 41 claims. Open Payments data shows 29 records totaling $715. You can download detailed data with all billing codes (2015-2024). For more recent data, please contact us.

Over the past 10 years, this provider's Medicare Part B carrier billing has declined steadily, from $2,458,768 to $1,150,484. Concurrently, Part D prescription costs did not follow a clear longitudinal pattern. For DME billing, this provider has fewer than 5 years of reported data, so a reliable trend cannot be assigned.