If your patient is on a monthly payment plan, the system will expect the amount of the payment established when the plan was first created. It is listed in the Payment Amount column in their chart under the OnPatient Payments tab > Patient Payment Plan header.
** Please note processing patient payments through payment plans requires that you are utilizing DrChrono Payments **
If they would like to make an additional payment, you can do that by selecting "Pay" next to another pending payment.