Block 9c describes which identifier?

• A. The Coordination of Benefits Agreement Medigap-based identifier
• B. The good faith effort indicator
• C. The nine-digit payer ID
• D. The birth date

Answer: (A)

Block 9c is the field used for the Coordination of Benefits information when a Medigap plan is involved. It records the Medigap-based identifier that links the claim to the secondary payer in a COB scenario, helping the claim flow to the correct insurer for proper benefit coordination with Medicare. This is not the patient’s birth date or a nine-digit general payer ID, and it’s not the good faith effort indicator, which serve different purposes on the form. Remember, when a patient has Medicare plus a Medigap policy, the 9c area is where you input the identifier that identifies that Medigap policy for proper COB processing.