Discretionary insulin delivery systems and methods

A method, comprising:

• receiving a user input defining a set of parameters of a discretionary insulin delivery mode of a system configured to deliver insulin to a user, wherein, when the system operates within the discretionary insulin delivery mode, the system, without further input from the user, is permitted to deliver discretionary insulin to the user according to a variable basal rate between an upper threshold basal rate and a lower threshold basal rate responsive to events associated with the user and within the defined set of parameters;
• responsive to receiving an indication of an event associated with the user:
• determining, via the system, the lower threshold basal rate to comprise a first basal rate that is lower than a constant basal rate of a non-discretionary insulin delivery that would have been delivered to the user according to a non-discretionary insulin delivery schedule absent receiving the indication of the event;
• determining, via the system, the upper threshold basal rate to comprise a second basal rate that comprises the constant basal rate of the non-discretionary insulin delivery that would have been delivered to the user according to the non-discretionary insulin delivery schedule absent receiving the indication of the event in addition to a basal rate determined based on the indication of the event;
• and
• starting the discretionary insulin delivery mode of the system and delivering an amount of the discretionary insulin to the user according to the variable basal rate;
• and
• responsive to tracked discretionary insulin delivered to the user and a received glucose value, ceasing the discretionary insulin delivery mode of the system and delivering an amount of non-discretionary insulin to the user according to the non-discretionary insulin delivery schedule having the constant basal rate, wherein the system is not permitted to adjust the non-discretionary insulin delivery within the non-discretionary insulin delivery schedule.