Final answer:
The period of skilled nursing care during an inpatient acute hospital stay is reported using FL 24 (Dates of Service).
Step-by-step explanation:
The correct answer is a. FL 24 (Dates of Service). On a claim form, the period of skilled nursing care that occurs during an inpatient acute hospital stay is reported using FL 24, which stands for 'Dates of Service.' This field reports the start and end dates of the service provided, in this case, skilled nursing care.
This specific field (FL 24) is designed to capture various dates related to the patient's stay that affect billing, such as the date of an accident or the start of a medical condition requiring hospitalization, which would include the start of skilled nursing care. FL 12, FL 31, and FL 18 represent other pieces of information altogether (Dates of Service, Patient Address, and Admission Date respectively).