Final answer:
Upcoding is the practice of assigning a diagnosis code that does not match the patient's documentation in order to increase reimbursement through the DRG system.
Step-by-step explanation:
The correct answer is c. upcoding.
Upcoding refers to the practice of assigning a diagnosis code that does not match the patient's documentation in order to increase reimbursement through the DRG (Diagnosis-Related Group) system. It involves using a more severe or expensive diagnosis code than is justified by the patient's actual condition. This practice is considered fraudulent and can result in penalties and legal consequences.