Medicare's Timely Filing Limit: How to Keep Claims Inside It

A claim that misses its filing limit is one of the few billing problems that usually cannot be fixed afterward. The service was provided and documented, the code was right, and the payer still owes nothing because the claim arrived too late. Most of these losses are preventable with a simple routine.

The Medicare limit

For Medicare, a claim generally has to be filed within one calendar year after the date of service. That sounds generous, but the year is easy to lose in practice: a claim rejected at the clearinghouse and never resubmitted, a charge that sat unbilled while a provider's enrollment was pending, or a secondary claim that waited on a primary payment that never came.

Commercial plans set their own limits in each payer contract, and many are much shorter than Medicare's. The limit that matters is the one in the contract for that payer, which is why a billing team keeps a filing-limit list per payer rather than relying on one rule for every claim.

Accepted is not the same as sent

A claim leaving your practice management system is only the first step. The clearinghouse checks it, then the payer checks it again, and either one can reject it before it ever enters adjudication. For Medicare claims, the payer reports acceptance or rejection back to the submitter in a claim acknowledgment transaction known as the 277CA.

That acknowledgment is the most useful record a practice has when a payer later says it never received a claim. Keep it with the claim, and work every rejection on the day it arrives, because a rejected claim does not stop the filing clock.

A routine that protects the deadline

1. Release charges promptly after each visit, so the filing period is not spent waiting for coding or documentation.
2. Work clearinghouse and payer rejections daily, and resubmit corrected claims the same day where possible.
3. Keep a filing-limit list for every payer you bill, taken from each contract, and sort aging reports by the date each claim will expire.
4. Track claims held for missing enrollments or referrals separately, so a pending item does not quietly run past its limit.
5. Store acceptance reports and payer acknowledgments with each claim as proof of timely filing.

When a claim is denied rather than rejected

Filing limits apply to getting the first claim in. Once Medicare has made an initial determination, a different clock starts: a request for redetermination, the first level of appeal, generally has to be filed within 120 days of receiving the notice. Medicare Part A and B appeals have five levels in all, and each has its own deadline.

Commercial plans set their own appeal deadlines and processes in their provider manuals and contracts, so the appeal calendar, like the filing-limit list, is kept payer by payer.

The takeaway

Timely filing losses rarely come from one big mistake. They come from claims nobody was watching. A daily rejection queue, a payer-by-payer limit list and an aging report sorted by deadline turn the filing limit from a risk into a routine.