Calculator Methodology
The calculator uses basic date arithmetic: last fill date, days supplied, whether the fill date counts as day one, and an optional percentage threshold. The calculation is an estimate, not a decision about coverage, dispensing, legality, or clinical suitability.
Official Reference Links
When to Confirm Elsewhere
Confirm payer-specific, pharmacy-specific, controlled-substance, state-law, emergency, lost medication, vacation, transfer, or override questions directly with the relevant pharmacy, prescriber, insurer, or official agency.