Final answer:
In Block 9A, the Medigap coverage information should be entered, including the policy number and the name of the insurance company.
Step-by-step explanation:
In Block 9A of a patient's Medicare claim form, the Medigap coverage information should be entered. Medigap is a type of supplemental insurance that helps cover healthcare costs that Medicare does not pay for, such as copayments, deductibles, and coinsurance. In this block, the specific information about the Medigap policy, including the policy number and the name of the insurance company, should be entered.