A reasonable collection attempt in regards to collection is not by "specialty" so whether it's a DME or a chiropractor it makes no difference. A reasonable attempt means consistent for a period of time. A reasonable time is 3 monthly billing cycles. It's also worth noting that ROUTINELY writing off patient balances can be considered illegal.. What I do is alert my provider to an account that needs further attention (more than I can offer) I usually do this 14-21 days AFTER the third billing attempt. My provider then makes the final decision to send to collections or write off the balance. I require the directions in writing and signed by the physician before doing either.