Denial code CO-29

What does Denial code CO-29 mean on a medical bill?

CO-29 means the claim reached the plan after the window the plan gives providers for sending it in. Every plan sets that window in its contract and they are not all the same, so the plan itself is the only reliable source for yours. When a claim misses the window, payment stops for a reason that has nothing to do with your care, and the CO letters put it on the provider's side of the contract. Timing is what to read here: when the care happened, and when the claim was first filed.

What should I watch out for with Denial code CO-29?

• Ask the billing office for the date they first filed the claim and what proof of filing they hold
• Ask your plan to confirm the filing window in the provider's contract instead of taking either side's word
• Watch for a CO-29 line landing on your statement, and ask in writing which contract term moved it there