Determine timely filing limits by payer type and implement an appeal submission workflow for timely filing denial reversals

Steps

1. Catalog timely filing limits by payer category: Medicare requires submission within 12 months of the date of service for most claims; Medicaid limits vary by state (commonly 90–365 days); commercial payers typically specify 90–180 days from DOS in their provider agreements — retrieve the specific limit from each payer's provider manual or contract
2. Implement a filing deadline monitor in your billing system: flag any claim not submitted within 80% of its timely filing window (e.g., flag at day 72 for a 90-day limit) to trigger manual review before the deadline passes
3. When a claim returns CARC 29 (timely filing) denial, assess whether an exception applies: common exceptions include payer-caused delay (enrollment issues), coordination of benefits delay, retroactive eligibility changes, or natural disaster; gather supporting documentation for each
4. Build the appeal packet: cover letter citing the specific timely filing policy and exception, original claim with all service lines, proof of timely filing (clearinghouse acceptance timestamp, 277CA acknowledgment date, or certified mail receipt), and any supporting documentation for the exception
5. Submit the appeal via the payer's required channel: many payers accept written appeals by mail or fax; some accept electronic appeal submissions via portal or EDI 277CA response workflow; note the appeal submission date as the start of the payer's review clock
6. Track appeal outcomes: if the timely filing appeal is denied, evaluate whether a second-level appeal or external review is available; for Medicare, the appeals process follows five levels (redetermination → reconsideration → ALJ → MAC → Federal District Court)