I also agree that it depends on the situation. If it's just a general billing issue, for example a patient is upset over a bill they received (usually it's about a high deductible), it doesn't really belong in the patient's record per se. In the facility I work at, we direct our staff to note the account (similar to a phone note I suppose) detailing the interaction and what was done to resolve the problem. Mostly it's for documentation purposes. However, if the patient complaint is directed back to the billing staff, say to review the coding, they will document that in the patient's record; and the referring staff member will also put up a note on the account.