When Medicare is the primary payer, what should Block 3 contain?

• A. The insured's name
• B. The beneficiary's date of birth
• C. Leave Block 3 Blank
• D. The insurer's address

Answer: (C)

Block 3 is reserved for insured-related information when there is a primary policy other than the patient. When Medicare is the primary payer, there isn’t an additional insured to report in this field, so the proper practice is to leave Block 3 blank. Filling it with the insured’s name or the insurer’s address would imply a primary policy outside of Medicare and could cause processing errors or confusion. The patient’s identity and Medicare beneficiary status are handled in other parts of the form, so no data is needed here.