Physician
Mark P Diehl, DO
According to 2025 Medicare claims, Mark Diehl, DO (NPI: 1982667754) practices rheumatology in the Gettysburg, PA market, with the plurality of this provider's patient population coming from Adams, PA. This provider's primary affiliated billing organization is WELLSPAN MEDICAL GROUP (NPI: 1407916018; TIN: 23-2730785) and primary practice location at 17325-7875. Diehl is affiliated with the WellSpan Population Health Services (ACO ID: A2500), participating under the MSSP model.
Diehl's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 584 traditional Medicare patients, billed 24,173 HCPCS/CPT codes, and received $388,364 in Medicare payments. The top billing code was 99214 (Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more). Part D data shows 4,570 prescription claims across 700 beneficiaries totaling $5,757,538 in drug costs, led by Enbrel Sureclick (Etanercept). Open Payments data shows 32 records totaling $18,112. 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 moved sharply higher in recent years, from $97,458 to $388,364. Similarly, Part D prescription costs have moved from a lower plateau to a higher plateau, from $1,809,434 to $5,757,538. For DME billing, this provider has fewer than 5 years of reported data, so a reliable trend cannot be assigned.