Home-care timely filing limits: the deadline that quietly writes off real revenue.

Timely filing is the deadline nobody schedules around until it has already cost them. A caregiver shows up, does the work, documents it. The claim, for one reason or another, does not go out clean, or goes out and denies and then sits. Months pass. By the time someone finds it, the filing window has closed, and a claim for real, delivered care is no longer payable. There is no appeal for "we just got to it." For an agency billing Medicaid personal care in small units, a steady trickle of claims aging out is one of the quietest ways margin disappears, because nothing about it feels like a loss until the year-over-year collected number comes in lower than the billed number and nobody can say exactly why.

This is the operator's version of how filing deadlines actually work, why they are usually shorter than people assume, and what separates a claim you can still recover from one that is gone for good.

The federal ceiling is 12 months, and it is not your real deadline

The federal rule is specific. Under 42 CFR 447.45, a state Medicaid agency must require providers to submit all claims no later than 12 months from the date of service. That is the outer wall. It is also where most operators stop reading, which is exactly the mistake.

Twelve months is the federal maximum, not a guarantee you get a year. States are free to set shorter filing windows, and many do. Published state references put common Medicaid limits at 90, 120, 180, or 365 days, varying not just by state but sometimes by program and claim type within a state. A number of states do run the full 365-day window; many others are tighter. The only way to know your real deadline is to read it off your state's Medicaid manual, not to assume the federal year.

Then there is managed care. When you bill a Medicaid managed-care plan rather than fee-for-service, the plan sets its own filing window inside its provider contract, and that window can be considerably shorter than the state's fee-for-service limit. An agency feeding several plans is therefore juggling several deadlines at once. The practical filing deadline for any single claim is whichever is shortest: the federal ceiling, the state limit, or the plan contract. You are always racing the tightest of the three.

What a CO-29 denial is actually telling you

When a claim crosses its filing deadline, the payer does not pay it quietly. It denies it with a code, and the most common one is CO-29. That code is two pieces stacked together on the 835 electronic remittance. The CO is the group code for contractual obligation, meaning the payer is assigning the unpaid amount to you, the provider, under the terms of the contract, and you generally cannot turn around and bill the client for it. The 29 is the Claim Adjustment Reason Code that X12, the body that maintains these codes, defines as "The time limit for filing has expired."

So a CO-29 is not ambiguous. It is the payer's records saying the claim arrived after the window your contract or the state manual allowed. Medicare uses CARC 29 the same way for its own one-year filing limit. When you see CO-29 piling up on your remittances, you are looking at a list of claims for real services that the payer is refusing to pay purely on timing.

Why on-time visits still miss the window

The thing that makes timely-filing losses so frustrating is that the care almost always happened on schedule. The visit and the claim run on two different clocks, and only one of them gets watched. A visit delivered on the first of the month can still blow its filing deadline because the claim behind it got stuck. The usual reasons a claim stalls long enough to age out:

• Held for a missing authorization. The claim cannot go out until the auth is in place, and while it waits, the filing clock keeps running from the original date of service.
• Parked behind an EVV mismatch. A visit that did not reconcile to the state aggregator gets held back, and the hold quietly eats the window.
• Denied once and never reworked. A claim denies for a fixable reason, lands in a worklist, and nobody returns to it before the clock closes.
• Lost in the system gap. The claim falls into the seam between the EMR and the clearinghouse and never actually transmits, so the agency thinks it was billed when it never left.

None of these are late care. They are stalled claims. And because the deadline runs from the date of service rather than from whenever the obstacle clears, every day a claim sits is a day off the same window.

Which timely-filing denials you can still recover

Not every aged-out claim is lost. A claim that has genuinely blown every applicable deadline is generally gone, but a meaningful share of timely-filing denials are recoverable, and the difference is usually about proof and timing.

The recoverable cases tend to be these: the claim was actually submitted on time and the payer's records are wrong, in which case proof of the original timely submission supports an appeal; a documented exception applies, such as retroactive eligibility being granted after the fact, or a corrected claim that ties back to an original timely filing; or a payer processing error caused the denial. Each of those has an appeal path. But appeals have their own clocks, so a CO-29 that is itself left to sit can pass the appeal window too, and then even the recoverable version is gone. The claims worth chasing are the ones where someone looked while there was still time to attach the proof.

How agencies stop bleeding revenue to the clock

The agencies that do not lose money to timely filing treat the filing window as a live clock on every open claim, not a quarterly cleanup. In practice that means three habits: knowing the real deadline for each payer and plan they bill rather than assuming the federal year; watching the aging of claims that are held or denied, not just the ones that paid; and reworking recoverable denials, the CO-29s and the upstream auth and EVV problems that create them, while there is still room to file or appeal.

This is squarely what Reeve looks at. It sits read-only over whatever EMR and billing export an agency already runs, whether that is WellSky, AxisCare, HHAeXchange, AlayaCare, or anything else, and reconciles claims against authorizations and remittances to surface the ones aging toward a deadline, the denials still inside their window, and the CO-29s that signal a window already missed. Because Reeve does not sell billing or scheduling, it has no reason to look past a claim that is quietly aging out. For the codes themselves, see Medicaid claim denial codes and home-care claim denials. For the auth holds that start the stall, see the authorization-to-claim gap. For the full playbook this sits inside, see home care revenue recovery.

The hard truth of timely filing is that the loss is invisible until it is permanent. A claim is collectible the whole time it sits, right up until the moment it is not. The only defense is to look before the clock runs out.