Notes on payer behavior
What is denial recovery? The denials worth chasing, and the ones that aren't
Denial recovery is the work of getting paid on claims an insurer denied for a reason that can be fixed: missing information, an authorization that was on file, a timely-filing dispute you can prove, a bundling edit your contract doesn't allow. It's distinct from denial prevention (cleaner claims going out) and from clinical appeals (arguing medical necessity). It's the part in between, where the care was delivered, the claim was legitimate, and the payment stopped on a technicality. For a practice of 3 to 15 physicians it's usually the largest pool of recoverable money nobody is working.
How big the pool is
Denials are rising and most are winnable, and the numbers come from the providers themselves. A 2024 Premier survey found nearly 15 percent of claims to private payers were initially denied, and that private payers overturned more than 60 percent of the denials providers actually fought, at an average cost of about $44 per claim to fight them (Premier). Experian Health's 2025 State of Claims survey put the industry's initial denial rate at 11.8 percent in 2024, up from 10.2 percent, with 41 percent of providers now seeing denial rates of 10 percent or higher. The top causes named were missing or inaccurate claim data (50 percent) and authorization problems (35 percent) (Experian Health).
Read those together. More than one claim in ten is denied. The majority of those denials are for administrative reasons. And when someone pushes back, the payer reverses most of the time. The money is there. The pushing is the constraint.
Which denials are recoverable
Not all of them, and knowing the difference is most of the skill. The recoverable ones share a trait: the fix is documentary, not clinical.
| Denial | Typical code | The fix |
|---|---|---|
| Missing or invalid information | CO-16 plus a remark code | Supply the field the remark code names and resubmit. Read the remark code. |
| Authorization "absent" when it was on file | CO-197 | Match the auth number, dates and units to the claim; resubmit or reconsider. The triage. |
| Timely filing, with proof of prior submission | CO-29 | Attach the clearinghouse acceptance and the payer's rejection history. The date math. |
| Bundling the contract doesn't permit | CO-97 | Cite the contract's edit policy and the modifier; request reprocessing. Bundling and global periods. |
| Level of service reduced by algorithm | CO-150 | Send the note; the level is set by MDM or time. Downcoding. |
| Prior auth approved, claim denied anyway | Varies | The approval itself is the appeal. The approved-then-denied pattern. |
What doesn't belong in the pool: denials where the insurer disputes medical necessity, denials for services the plan genuinely excludes, and Medicare overpayment or refund situations. Those are clinical appeals or compliance matters, a different job with different rules.
Why billing teams don't recover more of it
Because the math of working one denial at a time doesn't close. A denied $180 line takes forty minutes to research, thirty to package, and sixty days to resolve. Premier's number, $44 per fought claim for a hospital with a dedicated team, understates it for a five-person front office. So the queue gets triaged: the big ones get worked, the rest age out, and the rest is most of the volume. Experian's respondents reported the same thing, year after year. It's not effort. It's unit economics.
The economics change when denials are worked by pattern. One payer denied 400 claims with CO-197 over a quarter, and 300 of them had valid authorizations on file. That's one root cause, one claim list, one packet, one conversation with a provider representative, and often one systemic fix on the payer's side. The 400 claims that didn't justify forty minutes each justify a week together.
What denial recovery costs
Recovery firms, Clearia included, typically work on contingency: a percentage of what actually arrives, nothing upfront, no software fee. The rate is set in the engagement letter. The structure matters more than the number. On contingency the firm is paid only when your account is, so the incentive is to pursue what will reverse and leave alone what won't. A fee for effort would reward filing everything. A fee for results rewards being right about which denials are recoverable, which is the skill you're buying.
The deadlines that decide it
Every denial has a clock. Payer contracts typically give 90 to 180 days from the denial to appeal, and each payer's manual sets its own steps inside that (the Florida table). Timely-filing denials have their own arithmetic. Florida's prompt-pay statute adds levers on state-regulated commercial and HMO plans: a 120-day tripwire after which a claim not paid or denied becomes an uncontestable obligation to pay, and 12 percent simple interest on overdue payments (the prompt-pay guide). None of that applies to self-funded employer plans, Medicare Advantage, or federal employee plans. The practical rule: the oldest recoverable denial goes first, because it's the one about to become unrecoverable.
What it means for your practice
If your denial rate is anywhere near the industry's 11 to 15 percent, and most of those denials are administrative, and most administrative denials reverse when worked, then there is a pool of earned money sitting in closed claims right now. Its size is knowable. Pull a year of remittances, count the CO-16, CO-29, CO-97, CO-150 and CO-197 lines, and sum them. That count, line by line, with the deadlines attached, is the first thing Clearia's diagnostic produces. It's free, and if the pool turns out to be small, you'll have confirmed it from your own data.