Notes on payer behavior

How to tell whether an insurer is underpaying your practice

Clearia · July 2026 · a practical check you can run in an afternoon

Most practices have never checked. Not because nobody cares — because nothing ever asks the question. An underpaid claim doesn't look underpaid: the payment posts, the balance goes to zero, and the claim files itself under finished. The only way to know is to compare what each insurer actually paid against what your contract says it owed — and that comparison isn't part of anyone's daily job.

Here is how to run it yourself, at small scale, with the records you already have.

What insurance underpayment actually is

Underpayment is the gap between the contracted rate — the allowable your payer agreement assigns to each procedure code — and what the payer actually allowed and paid on a clean, correctly billed claim. It is not denial management: the claim wasn't rejected. It is not patient responsibility: the balance isn't owed by anyone, according to the payer. The claim looks complete. It simply settled short of the contract.

It takes a few recurring forms:

• Rate shortfalls — the allowed amount lands a few percent under the fee schedule, small enough to post without a second look.
• Downcoding — the payer adjudicates a lower-valued code than the one billed, and pays the lower rate.
• Bundling — line items are folded into another procedure and paid as zero, even where your contract says they're separately payable.
• Stale fee schedules — you renegotiated rates, but the payer's system keeps paying the old ones.

The afternoon check

You need three things: your remittance data (the payment detail your billing system posts from each payer), the fee schedule from one payer contract, and a spreadsheet. Then:

1. Pick your highest-volume commercial payer. Whatever pattern exists will be loudest where the claim count is highest.
2. Pull 20 to 30 recent zero-balance claims for your five most-billed procedure codes. Zero-balance matters: you are deliberately auditing claims everyone considers finished.
3. For each claim line, write down three numbers: what was billed, what the payer allowed, and what the contract's fee schedule says the allowable should be. The allowed-versus-contract comparison is the whole test — ignore the billed charge beyond confirming the code.
4. Also note the code the payer paid. If you billed one code and the remittance shows payment at a different, lower-valued one, that line was downcoded — record it even if the arithmetic on the paid code looks correct.
5. Total the gaps. Shortfall dollars per line, times the frequency of that code, times a year of volume. That last multiplication is the number that decides whether this matters.

Why even good billing teams don't catch this

Because the system is built to move forward, not to look back. A biller's day is claims out, rejections worked, payments posted, days-in-AR down. Every incentive points at keeping the queue moving — and a zero-balance claim is the definition of done. Reconciling every remittance line against a fee schedule, payer by payer, is a different job entirely, and in a practice of 3 to 15 physicians, nobody holds it.

There's also a rational-economics trap: any single underpaid line is small — often tens of dollars. Chasing one never pays for the time it takes. The economics only flip when the pattern is identified and hundreds of matching claims are pursued as one case. That's why the problem persists even in well-run practices: individually ignorable, collectively expensive.

One deadline to know about

Payer contracts set windows for disputing a payment — commonly 90 to 180 days from the remittance date. Claims older than the window are typically unrecoverable regardless of how clear the shortfall is. Practically, this means two things: run the check on recent claims first, and if you find a real pattern, the clock argues for acting on it rather than filing it away.

If you find a gap

Three honest options:

1. Work it internally. If the pattern is one payer and one code, your biller may be able to file reconsiderations directly through the payer's own dispute process. Budget real hours: documentation, contract citations, and follow-up over one to three months per batch.
2. Raise it at renegotiation. A documented underpayment pattern is leverage in the next contract cycle — though this recovers nothing already lost, and the dispute window keeps running.
3. Bring in a recovery firm. Contingency-based firms audit the full remittance history, build the cases, and pursue them at scale — typically paid only as a percentage of what's actually recovered. The trade is a share of the recovery for zero internal hours and pattern expertise you'd otherwise build from scratch.

Whichever route: the afternoon check is worth running first. It costs a few hours, uses records you already own, and replaces a vague worry with a number.