What is defined as a patient's financial account where payments have not been made on time?

A patient's financial account where payments have not been made on time is referred to as a delinquent account. This term specifically applies to accounts that are overdue and where the patient has failed to meet their financial obligations within the designated timeframe. Delinquent accounts are often subject to follow-up actions, such as reminders or collections, to encourage payment.

In contrast, an active account refers to accounts that are currently open and in good standing. A closed account is one that has been settled or terminated, meaning no further transactions are expected. A reopened account denotes that a previously closed account has been reopened, which is not related to payment timeliness but rather a status change. Therefore, the definition of a delinquent account precisely captures the essential characteristic of overdue payments, making it the correct choice.