How the conversion factor fits into the pricing formula
Relative value units describe how much work, overhead, and risk a service involves relative to other services, but on their own they aren't a dollar amount. The conversion factor is the multiplier that turns that relative value into an actual reimbursement figure:
Allowed Amount = Relative Value (e.g., RVU) × Conversion Factor
Because the conversion factor is a single number applied across an entire fee schedule, it has an outsized effect on reimbursement: a small change in the conversion factor changes the allowed amount for every code priced under that schedule.
Why conversion factors vary by state and specialty
Each state sets its own workers' compensation conversion factor (or factors), independent of the Medicare conversion factor and independent of other states. Many states publish multiple conversion factors within the same fee schedule, using different values for categories such as evaluation and management services, surgery, radiology, or physical medicine. That means the same underlying RVU can translate into meaningfully different reimbursement depending on which specialty category the billing code falls into, even within a single state's fee schedule.
Annual updates and effective dates
Conversion factors are typically updated on a set schedule, often annually, through state regulatory action. Correctly pricing a bill requires applying the conversion factor that was in effect on the specific date of service, not the current published value, since fee schedule updates are rarely retroactive. This becomes especially important for older bills or bills involving a dispute, where the date of service may predate the most recent conversion factor update.
A worked example
Consider a service with a total relative value of 5.0 units under a state's professional fee schedule. If that state's conversion factor for the applicable specialty category is $55.00, the allowed amount before any geographic or place-of-service adjustment would be 5.0 × $55.00 = $275.00. Change the conversion factor to $48.00, and the same relative value produces an allowed amount of $240.00, even though nothing about the service itself changed.
How BillSentry applies conversion factors
BillSentry automatically identifies the applicable workers' compensation reimbursement methodology and calculates the allowed amount at the bill-line level, applying the correct state- and specialty-specific conversion factor for the date of service on each line.
The resulting calculation is documented as a RuleTrace™, showing the relative value, the conversion factor applied, and the regulatory citation supporting it, so the math behind every allowed amount is fully visible.