State variation in Medicaid and Medicare reimbursements in musculoskeletal radiology.

BACKGROUND

Medicaid reimbursements for physician services are determined by each state. However, how these reimbursements vary between states, and how these reimbursements vary in comparison to Medicare reimbursements is unknown for musculoskeletal radiology studies.

OBJECTIVE

To evaluate the variability in Medicaid and Medicare physician reimbursements for musculoskeletal imaging studies between states.

METHODS

We evaluated the Medicare and Medicaid physician reimbursements for the most commonly performed musculoskeletal radiology studies (15 radiographs and 10 MRIs) based on Medicare's 2017 National Summary Data File. Medicare and Medicaid reimbursements for these studies were compared by dollar difference (difference in reimbursement in dollars between Medicare and Medicaid). State-wide variability in these reimbursements was quantified by the coefficient of variation (COV) and by the dollar difference in reimbursement amounts. Medicaid and Medicare reimbursement rates were compared using a paired t-test, since the data was paired by state.

RESULTS

The mean Medicaid reimbursement rates were lower for musculoskeletal radiographs (p < 0.05) but higher for musculoskeletal MRI studies than the Medicare rates (p < 0.05). As hypothesized, there was variation in both Medicare and Medicaid imaging reimbursements between states, however, the variation was substantially higher for Medicaid reimbursements. We found the Medicare reimbursement COV between states was 0.07 for all imaging studies, whereas the Medicaid reimbursement COV between states varied from 0.23 to 0.55 for radiographs and from 0.31 to 0.45 for MRIs.

DISCUSSION

The data show that there is mild, but constant variation across imaging studies in Medicare reimbursement for musculoskeletal imaging studies between states. However, there is more variation in the Medicaid reimbursements across imaging studies and between states. More appropriate reimbursement may increase access to care for Medicaid patients.