Final answer:
The designated record set is a collection of records that includes both medical and billing information. It is not limited to only demographic information or only billing information.
Step-by-step explanation:
The designated record set is a collection of records that includes both medical and billing information. It is not limited to only demographic information or only billing information. The set typically includes patient medical records, such as diagnoses, treatments, and test results, as well as billing records, such as insurance claims and payment history.
For example, a designated record set could include a patient's medical history, including doctor's notes, lab results, and imaging reports, as well as billing information such as invoices and payment receipts.
Therefore, option b is the correct answer: It contains both medical and billing information.