Guide · Billing
Timely Filing Limits for Behavioral Health Claims
Every payer sets a hard deadline to submit a clean claim after the date of service — miss it and the visit usually becomes an unrecoverable write-off. This guide explains the limits, why behavioral health practices miss them, and how to protect every dollar.
The Basics
What “Timely Filing” Actually Means
Timely filing is the maximum amount of time a payer allows between the date of service and the day a clean claim lands in their system. Every insurer sets its own window. Submit one day past the limit and the claim comes back denied — typically with remittance advice code CO-29, “the time limit for filing has expired.”
The painful part is what happens next. A timely-filing denial usually cannot be billed to the patient, and it cannot simply be re-billed to recover the money. Unless you can prove the claim was submitted on time, that session becomes a write-off. There is no appeal on the merits of the care delivered — only on whether the filing deadline was actually met.
Behavioral health practices carry more timely-filing risk than most specialties. Care runs as recurring weekly or biweekly sessions, so a single broken workflow can quietly bury dozens of claims at once. Authorizations expire and get re-requested mid-treatment. And every claim has to survive the handoff from the EHR to the clearinghouse to the payer — a chain where claims regularly stall without anyone noticing until the deadline has already passed. Catching these patterns early is a core part of disciplined revenue cycle management.
Deadlines
Typical Filing Limits by Payer
Filing limits are set by contract, not by a single national rule, so the figures below are common ranges — not guarantees for your specific plans. Always confirm the exact window in your participating-provider agreement or the payer’s provider manual before you rely on it.
| Payer type | Typical initial filing limit |
|---|---|
| Medicare (Part B) | 12 months from the date of service |
| Medicaid / state plans | Varies widely — commonly 95 to 365 days |
| TRICARE | 12 months from the date of service |
| Commercial / BCBS | Often 90 to 180 days (some plans allow 365) |
| Corrected / resubmitted claims | Frequently shorter — 60 to 180 days from the determination |
Caveat: these are typical ranges only. Your contracted limits may be shorter or longer. Verify each payer’s deadline in your contract or provider manual before treating it as final.
Root Causes
Why Claims Miss the Deadline
Timely-filing write-offs are almost never caused by a single late claim. They come from systemic gaps where claims slip out of view until the clock has already run out. These are the usual culprits.
Front-End Delays
Charges that sit uncoded, intake errors, or unverified eligibility hold claims back at the source. By the time the front-end queue clears, a shorter commercial window may already be closing.
Authorization Waiting
Teams often hold claims while waiting on a prior authorization or retro-auth. Behavioral health auths lapse and get re-requested mid-treatment, and that waiting period eats directly into the filing limit.
Rejections That Sit
A clearinghouse rejection is not a denial — it means the claim never reached the payer. If a rejected claim sits unworked, the corrected version can blow past the original deadline, and the payer counts it as never filed.
EHR-to-Clearinghouse Gaps & COB Clock
Claims silently fail the handoff between the EHR and clearinghouse and never transmit. Secondary claims add their own risk: the coordination-of-benefits clock can expire while you wait on the primary payer’s remittance.
Prevention
How to Protect Every Deadline
Preventing timely-filing write-offs is a discipline, not a one-time fix. A practice that submits on a predictable rhythm and watches its aging closely rarely loses money to CO-29. Build these habits into your weekly workflow.
- Track each payer’s filing limit in one reference your billing team actually uses — not buried in individual contracts.
- Submit claims on a predictable cadence (daily or several times a week) so nothing waits in a batch for weeks.
- Work clearinghouse rejections within 48 hours, while there is still runway to correct and resubmit before the deadline.
- Track authorizations separately from claims so an expired or pending auth never silently parks a claim.
- Run an aging report that flags claims approaching their filing limit, and prioritize those first.
- Keep proof of timely submission for every claim — the acceptance reports and acknowledgment numbers you will need if a denial is wrong.
Many of these same controls prevent the slow buildup of unbilled and unpaid claims. If write-offs are already mounting, our breakdown of what causes an A/R backlog covers the upstream problems worth fixing first.
Recovery
Appealing a CO-29 Denial
Not every timely-filing denial is final. If you can demonstrate the claim was submitted on time — or that the payer caused the delay — you can appeal, but only within the payer’s defined appeal window. The strength of your appeal comes down to the proof you kept. Gather it before you file.
Clearinghouse Acceptance Report
Your 277CA acceptance report shows the payer received and accepted the claim on a specific date. This is often the single most persuasive piece of evidence in a timely-filing appeal.
Payer Acknowledgment Number
A claim acknowledgment or trace number from the payer ties the original submission to a date inside the filing window, even if the claim was later lost on their end.
Dated Submission Logs
Time-stamped logs from your EHR or clearinghouse establish a paper trail of when each claim left your system, which is exactly what the appeal reviewer is checking.
Documentation of Payer Error
If the delay was the payer’s fault — an eligibility system outage, a misrouted claim, or incorrect coordination-of-benefits info — document it. Payer-caused delays are a recognized basis for overriding the limit.
A consistent appeal process pays off well beyond timely filing. Pair this with a repeatable denial management workflow so every denial type gets worked the same way, and lean on our denial follow-up worksheet to keep the proof and deadlines organized.
FAQ
Frequently asked questions
What is the timely filing limit for Medicare?
Medicare Part B generally requires claims to be filed within 12 months (one calendar year) of the date of service. Claims submitted after that window are denied and cannot usually be paid. Always confirm current requirements with your Medicare Administrative Contractor, since edge cases and exceptions exist.
Can a patient be billed for a timely-filing denial?
In most cases, no. When a claim is denied as CO-29 because the practice missed the filing deadline, the patient typically cannot be held responsible, and the amount becomes a provider write-off. Your specific payer contract governs the final answer, so check it before balance-billing anyone.
Does a clearinghouse rejection count as timely filing?
No. A clearinghouse rejection means the claim never reached the payer, so the payer does not consider it filed at all. The filing clock keeps running until a clean claim is actually accepted. This is why working rejections quickly — within 48 hours — matters so much.
How do I prove a claim was filed on time?
Keep your clearinghouse 277CA acceptance report, the payer’s claim acknowledgment or trace number, and dated submission logs from your EHR or clearinghouse. Together these establish the submission date inside the filing window and form the backbone of a timely-filing appeal.
Stop Losing Revenue to Missed Deadlines
We help Portland behavioral health practices submit on cadence, work rejections fast, and recover claims before the filing clock runs out.