A 3rd party payer is requesting documentation to support billed services. Which document should the MAA forward?

The correct choice in this scenario is progress notes. When a third-party payer, such as an insurance company, requests documentation to support billed services, they typically require detailed information about the patient's treatment and clinical interactions. Progress notes contain essential details such as the patient's medical history, diagnosis, treatment plan, and any services rendered during a visit. These notes provide the necessary documentation that substantiates the medical necessity of the services billed.

The other options do not serve this purpose effectively. The Notice of Privacy Practices outlines how a patient's information will be handled and protected, but it does not provide treatment details. A disclosure form is typically used to gain consent for sharing patient information, but it does not contain clinical data. The patient registration form includes demographic and insurance information but lacks the specific clinical details required to justify billed services. Thus, progress notes are the appropriate document to provide in this situation.