Appeal Deadline Calculator
A denial starts a clock. Enter the remittance date, pick the payer, and see the exact appeal deadline, the days you have left, and what late payment interest may be owed.
A denied claim has an expiry date. Miss the appeal window and the money is gone no matter how wrong the denial was. Enter the date on the denial or remittance and your payer, and this calculator gives you the deadline and how many days are left. These windows are the typical published examples — your provider contract and the payer's current policy always govern, so verify before you rely on a date.
Calculate your appeal deadline
Prompt-pay interest: what late payment costs the payer
Clean claims paid late often carry interest under state prompt-pay laws or your contract. The math is simple interest: amount x annual rate x (days late / 365).
Appeals are not the same as timely filing
Do not confuse this deadline with the timely filing limit for submitting the claim in the first place — that clock starts at the date of service and is covered by our timely filing calculator. The appeal clock starts when the payer decides: the date on the remittance advice or denial letter. Some payers count from the denial date, others from the date you received it, and corrected claims and appeals often run on different clocks with the same payer. When in doubt, count from the earliest defensible date and file early.
Reading your result
- More than 30 days left — build the strongest single appeal: records, coding rationale, contract page.
- Under 30 days — file first, supplement if the payer allows. Protect the date.
- Window closed — check for remaining appeal levels (Medicare has five), good-cause provisions, and state insurance-department complaint routes before writing the claim off.
Missed appeal windows are a process failure, not bad luck: working denials oldest-deadline-first is built into our denial management and appeals workflow, with every deadline tracked from the day the remittance posts.
Frequently asked questions
How long do I have to appeal a Medicare denial?
For a Part B claim, the first appeal level — redetermination by the Medicare Administrative Contractor — must be requested within 120 days of the date on the initial determination notice. (Do not confuse this with the separate 120-day figure sometimes quoted from receipt; file counting from the notice date to be safe.) Higher levels have their own windows.
Are commercial payer appeal windows really 180 days?
Many large commercial payers use appeal windows around 180 days from the denial for in-network providers, but the number genuinely varies by plan, state and contract — some are as short as 90 days. Treat the windows in this calculator as the typical published examples and confirm yours in your provider agreement; that is exactly why the calculator accepts a custom window.
What happens if I miss the appeal deadline?
In most cases the denial becomes final and the claim is written off — the payer is not obliged to consider a late appeal. Remaining options can include a further appeal level with a good-cause showing (Medicare allows late filing for good cause), a corrected-claim route if the issue is fixable, or a state insurance regulator complaint. All are weaker than a timely appeal.