A balance is a sum, not a number
Every point in and out is recorded with the reason it happened: the visit that earned it, the referral that credited it, the bill it came off, the adjustment a manager made.
So when a patient at the desk asks why she has the balance she has, your team can read it back to her line by line. That sounds small until you have had the other conversation, where the number changed by itself and nobody in the building can say why. A program your staff cannot explain is a program your staff will quietly stop mentioning.