How Do You Decide Which Denials Are Worth Appealing?
A denial is worth appealing when the amount you expect to recover is larger than the cost of the appeal, the denial is appealable and the deadline is still open. Check the first test before spending time, because a rejection is fixed and resent, not appealed.
Written by Salman Saeed, CEO and Co-Founder · Reviewed by a Certified Medical Coder · 
In short: confirm the claim was denied rather than rejected, calendar the deadline from the notice, then multiply the denied amount by your own chance of winning and subtract the cost of the appeal. Below the break-even balance, batch or write off the claim.
Which Denials Are Worth Appealing?
A denial is worth appealing when the money you expect to recover is larger than the cost of the appeal, the denial can legally be appealed, and you can still file inside the window. The first test is the one most teams skip: confirm it is a denial at all.
Medicare's own manual draws the line. Rejections "may be corrected and re-submitted," while "Denials are subject to appeal, since a denial is a payment determination." A claim returned for missing data is fixed and resent, which costs a fraction of an appeal. The fix path for the most common one is in how to fix a CO-16 denial.
How Much Time Do You Have to Appeal?
Read the date on the denial notice before anything else, because a strong appeal filed late is worth nothing. The two federal clocks most billing offices meet are below; payer contracts set their own, and those are in the payer manual and the contract.
| Route | Time to file | Source |
|---|---|---|
| Medicare redetermination (first level) | 120 calendar days from receipt of the notice, with receipt presumed 5 days after the notice date | 42 CFR 405.942 |
| Employer health plan under ERISA | At least 180 days after receipt of the adverse benefit determination | 29 CFR 2560.503-1(h)(3)(i) |
| Commercial plan, Medicare Advantage, Medicaid managed care | Set by the contract and the plan manual | Check the notice |
Put the deadline in the work queue the day the remittance posts. If the denial itself is a timing problem, see how to appeal a timely filing denial.
How Do You Work Out Whether the Appeal Pays for Itself?
Multiply the denied amount by your own chance of winning, then subtract what the appeal costs. If the answer is above zero, appeal. If it is below zero, write the denial off, or batch it with others, unless it is a symptom of a policy you want changed.
- Take the denied amount for the claim, not the billed charge, so use the contract allowed amount that was reduced to zero.
- Estimate the chance of winning from your own history of that denial reason with that payer. Do not borrow a national figure; the official figures that exist are explained in what percent of denials are overturned on appeal.
- Estimate the cost: the staff minutes to pull records, write and track the appeal, multiplied by a loaded hourly rate, plus copying, postage and any physician time.
- Compute the expected value: denied amount times chance of winning, minus cost.
- Compute the break-even balance: cost divided by chance of winning. Anything below it is not worth a manual appeal.
Your cost to prepare and track one appeal is $60, and for one payer and denial reason you win 40 percent of the time.
The ranking of the whole queue, with deadlines, is in the denial management playbook. This post covers the yes or no on a single denial.
Which Denial Reasons Tend to Be Worth the Effort?
Reasons where the payer's decision turns on a fact you can document are the best candidates, and reasons where a policy bars payment outright are the weakest. These are rules of thumb for sorting, not statistics; your own results should overrule them.
- Billing or data errors. Fix and resubmit instead of appealing. See the CO-16 code page.
- Medical necessity with a clear chart. Worth appealing when the record supports the policy criteria. The packet is in how to appeal a CO-50 medical necessity denial.
- Prior authorization. Worth it when authorization existed or was not required, with proof. See how to fix CO-197 prior authorization denials.
- Underpayment against a contract. Worth it when the fee schedule is in hand; see how to spot payer underpayments.
- Level-of-service reductions. For an emergency medicine billing group these can be high value per claim, because each emergency visit carries a large allowed amount relative to the cost of one appeal.
- Timely filing. Worth it only with proof of an earlier timely submission or an exception in the rules.
Does Medicare Set a Minimum Dollar Amount to Appeal?
Only at the third level. Under 42 CFR 405.1006, an ALJ hearing needs a minimum amount in controversy, and CMS's Federal Register notice for calendar year 2026 says the amounts "are $200 for ALJ hearings and $1,960 for judicial review." For requests filed on or after January 1, 2027 the notice sets $200 and $2,000.
The first two levels, redetermination and reconsideration, have no such minimum. Claims can also be added together: an appellant can aggregate two or more claims to meet the amount if they involve similar or related services and the request is filed within 60 calendar days after receipt of all the reconsiderations being appealed. The levels and deadlines are in the five levels of Medicare appeals.
What Should You Record so the Next Decision Is Better?
Record every appeal's payer, denial code, amount, cost estimate, level reached, outcome and days to decision. After a quarter, you have your own win rate per payer and reason, which replaces the guess in the math above.
- Win rate by payer and reason, counting partial wins separately.
- Average days from filing to decision, which sets follow-up dates.
- Denials that repeat, because a front-end fix often beats repeated appeals; see how to reduce medical claim denials.
How Nucleus Align Decides What to Appeal
Our denial management team works denials within 48 hours, sorts them into fix, appeal or write-off by reason and deadline, and tracks outcomes by payer. Book a call to review a denial queue, or return to the blog.
- Medicare Claims Processing Manual, Chapter 1, section 70.2.3.2 · CMS
- 42 CFR 405.942 Time for filing a request for a redetermination · eCFR
- 29 CFR 2560.503-1 Claims procedure · eCFR
- 42 CFR 405.1006 Amount in controversy required for an ALJ hearing and judicial review · eCFR
- Medicare Program; Medicare Appeals; Adjustment to the Amount in Controversy Threshold Amounts for CY 2026 (90 FR 55869) · Federal Register
- Medicare Appeals; Adjustment to the Amount in Controversy Threshold Amounts for CY 2027 (91 FR 58681) · Federal Register
We check every rule, code and deadline against the official source. See our editorial policy.
Common Questions
Straight answers from the team that does the work.
Ask a billing lead directly. A 20-minute call, Monday to Friday, 9am to 5pm Eastern.
01How do you decide which denials are worth appealing?
Appeal when the denied amount times your chance of winning is greater than the cost of the appeal, the denial is appealable rather than a rejection to fix and resend, and you can file inside the deadline. Use your own win rate for that payer and reason.
02What is the break-even balance for an appeal?
Divide the cost of one appeal by your chance of winning. If an appeal costs $60 and you win 40 percent of the time, the break-even balance is $150. Below it, batch the claims or write them off, unless the denial shows a payer policy worth challenging.
03Is a rejected claim an appeal?
No. Medicare's Claims Processing Manual says rejections may be corrected and resubmitted, while denials are subject to appeal because a denial is a payment determination. Correct the data and resubmit a rejection; appeal a denial with the proof, inside the window on the notice.
04Is there a minimum dollar amount to appeal a Medicare denial?
Not at redetermination or reconsideration. An ALJ hearing needs an amount in controversy, which CMS set at $200 for 2026 and again at $200 for requests filed from January 1, 2027. Claims with similar issues can be aggregated to reach it.
05How long do I have to appeal an ERISA plan denial?
An employer plan under ERISA must give at least 180 days after receipt of the adverse benefit determination, under 29 CFR 2560.503-1(h)(3)(i). Medicare allows 120 calendar days for redetermination. Other payers set their own windows in the notice and contract, so read the notice first.
Talk to a Billing Lead.
A 20-minute call about your payers, volume and setup. Monday to Friday, 9am to 5pm Eastern.