This year we began chargin a "rebilling fee" beginning at 90 days. We clearly state on our patient statements that the rebilling fee will be charged on balances over 90 days. It has been really effective in getting patients to pay earlier rather than watching their balance role across until it reaches the 120 day box. It has also helped with balancing out what we receive when we finally do send a patient to collections (we include the rebilling fees along with the balance).