When posting a payment to a patient's account,you must enter all but which of the following into the system?

A) date of the payment
B) previous balance
C) payment amount
D) form of payment

The previous balance is not directly entered when posting a payment; instead, the system automatically updates the patient's balance after the payment amount is entered. The date of the payment, payment amount, and form of payment are essential details that must be manually entered to accurately record the transaction.