https://asprcmsolutions.com/solutions/revenue-cycle-management-services/credit-balance-adjudication/

The credit balance, or the difference between the amount of money received and the costs for the medical services given is one of the most significant hazards in the healthcare revenue cycle. Credit balance issues can arise for various reasons, but the main causes include co-pays and deductibles, payer overpayments, and excessive payments. Such sums must be reimbursed by the healthcare provider to the patient or payer, whichever is appropriate.