We billed Medicare primary and they denied saying Cigna should have been primary. Now the Common Working File has been updated and Medicare says they will pay as primary if I send them a corrected claim bill type 137. BUT, I'm not changing anything on the claim, so how can it be a corrected claim? Which condition code would I put, and which two-letter adjustment reason code would I put in the remarks at the bottom left of the claim form?
Note: I have to mail them a paper claim because our electronic billing has been shut off. This is a hospital claim. I can't correct in DDE either.