Lets say client accepts the rider, then has a HA 1 yr later... now what...?
Depends on how the rider is worded.
GR riders exclude outpatient treatment (doc visits, Rx) for conditions like HTN & cholesterol. They do NOT exclude coverage for related conditions such as MI or CVA.
Most carriers, such as BX, Time & H1 write broad riders that would exclude not only the treated condition but anything related to it.
You have to look at each situation differently.