The transition-fill right: a temporary supply after a formulary change

Pharmacy fill history showing continuous use of the exact drug before the enrollment date or the formulary-change date is the core evidence for a transition-fill request — it's a different, often faster path than a full exception request, and worth raising explicitly rather than only filing a standard exceptions request.

A transition fill is meant to buy time, not resolve the underlying coverage question — it gives the family and prescriber a window to either switch to a covered alternative or put together a real exceptions request with a supporting statement, rather than leaving someone without any supply of a drug they were already stable on while paperwork is sorted out.

Because a transition fill is triggered by enrollment or by a formulary change rather than by a denial, it's easy for a family to miss that this right even applies — a pharmacy that simply says "not covered" at the counter may not mention the transition-fill option at all, so it's worth asking directly whether this is a new-enrollee or mid-year-formulary-change situation before assuming the only path forward is a full exception request.

The written notice a plan sends when it provides a transition supply is also worth reading closely — it should explain both that the fill is temporary and what the enrollee needs to do before it runs out, whether that's switching to a covered drug with the prescriber's help or filing a formulary exception. A family who fills the transition supply without acting on that notice can end up at the pharmacy counter again with no coverage and no time left to sort it out.