Insurance Write-Offs vs. Bad Debt in Dental Books

There are two kinds of write-offs in a dental practice, and they mean completely different things. One is expected, contractual, and a normal part of being in-network with an insurance carrier. The other is money you earned, billed for, and never collected. Your bookkeeping should treat them differently. Most practices don’t.

When both types of write-offs end up in the same account, or worse, when neither is tracked at all, your financial statements hide real problems behind blended numbers. This post breaks down what each type is, how they should be coded, and what happens to your metrics when they’re mixed together.

What PPO Contractual Write-Offs Are

When you join a PPO network, you agree to accept a contracted fee schedule. Your standard fee for a crown might be $1,200, but the PPO contracted rate might be $850. The $350 difference is a contractual adjustment. You agreed to it when you signed the contract. It’s not lost revenue. It’s revenue you never had.

Contractual adjustments are the difference between your full usual, customary, and reasonable (UCR) fee and the carrier’s contracted rate. They happen on every single PPO claim. They’re predictable, calculable, and a cost of being in-network.

In your books, contractual adjustments should be recorded as a reduction of gross production. They’re not an expense. They’re not a loss. They’re the gap between what you charged and what you agreed to accept. The formula is simple: Gross Production minus Contractual Adjustments equals Net Production. Net production is the number your practice actually operates on.

What Bad Debt Write-Offs Are

Bad debt is money you were owed and did not collect. A patient had a $400 balance after insurance paid their portion. You sent statements. You made phone calls. After 120 or 180 days, you wrote it off because the probability of collection dropped below the cost of continuing to pursue it.

Bad debt is real lost revenue. Unlike contractual adjustments, bad debt represents a failure somewhere in the collections process. Maybe the patient balance wasn’t communicated clearly at checkout. Maybe statements weren’t sent promptly. Maybe the patient simply can’t or won’t pay. Whatever the reason, this money was part of your net production and you didn’t collect it.

In your books, bad debt should be recorded as an expense (bad debt expense) or as a contra-revenue account that reduces net collections. It should never be lumped with contractual adjustments because they measure completely different things.

How Miscoding Distorts Your Financial Picture

Here’s what happens when contractual adjustments and bad debt end up in the same account (commonly labeled "write-offs" or "adjustments" with no further breakdown):

Your net production number becomes meaningless

If contractual adjustments and bad debt are combined, you can’t calculate net production accurately. Net production should reflect the amount you could have collected if your collections process was perfect. When bad debt is mixed in, net production is understated, and you can’t tell whether your collections are underperforming or your production is lower than you thought.

Your collection ratio lies to you

Collection ratio is net collections divided by net production. If bad debt is hiding inside the adjustments that calculate net production, your collection ratio looks artificially healthy. You could have a 98% collection ratio that’s actually a 93% collection ratio with 5% of bad debt buried in the denominator.

You can’t benchmark against industry standards

Industry benchmarks (ADCPA, NSCHBC) separate contractual adjustments from bad debt. If your books don’t make the same distinction, you’re comparing your blended number against a clean benchmark. You’ll either look better than you are (if bad debt is reducing net production) or worse than you are (if bad debt is hitting your collection ratio twice).

The Correct Accrual Treatment for Each

Contractual adjustments

Record as a contra-revenue account under gross production. This creates a clean path from gross production to net production. The entry happens when the EOB arrives and you know the actual contracted amount the carrier will pay. Until the EOB arrives, you can estimate the adjustment based on the fee schedule.

In QuickBooks, set up a specific account: something like "4200 Insurance Contractual Adjustments" as an income account with a negative normal balance (contra-revenue). Every time insurance pays less than the full fee, the difference posts here. Your net production is then 4100 (Gross Production) minus 4200 (Contractual Adjustments).

Bad debt

Record as an operating expense. When a patient balance is deemed uncollectible after your defined collection cycle (typically 120 to 180 days), debit bad debt expense and credit accounts receivable. This removes the balance from AR and records the loss where it belongs: as a cost of doing business.

In QuickBooks, use an expense account: "6800 Bad Debt Expense" or similar. This keeps bad debt visible on your P&L as an operating cost, separate from your revenue calculations. You can track it monthly, trend it over time, and investigate when it spikes.

Why this separation matters for dental specifically

In most industries, bad debt is a small percentage of revenue and doesn’t get much attention. In dental, the combination of insurance complexity, patient balance responsibility, and multiple collection pathways means bad debt can range from 1% to 5% of net production depending on practice type, location, and collections discipline. At $1.2 million in annual net production, the difference between 1% and 4% bad debt is $36,000 in lost revenue. That’s worth tracking separately.

A Practical Example

Let’s say your practice performs a crown with a full fee of $1,200. The PPO contracted rate is $850. Insurance pays $595 (70% of contracted rate). The patient owes $255.

Contractual adjustment: $1,200 minus $850 = $350. This is a contra-revenue entry. It’s expected, known, and not a loss.

If the patient pays the $255: your net collections on this procedure are $850 ($595 insurance + $255 patient). Collection ratio: 100% of net production. Everything worked.

If the patient never pays the $255: after your collection cycle, you write off $255 as bad debt expense. Your net collections are $595. Collection ratio on this procedure: 70% of net production. The $350 contractual adjustment is still a separate line item. The $255 bad debt is a separate line item. Each tells you something different.

If both the $350 and the $255 were lumped into "write-offs," you’d see $605 in write-offs and $595 in collections on a $1,200 procedure. That’s accurate math, but it tells you nothing about whether the $255 patient loss was preventable.

How to Fix This in Your Current Books

If your books currently lump write-offs together, the fix is straightforward but takes some setup:

First, create separate accounts: one contra-revenue account for contractual adjustments and one expense account for bad debt. Second, going forward, post each type to the correct account. Your bookkeeper or accountant needs to know the difference. Third, for historical data, you may need to review past write-offs and reclassify them. This is tedious but valuable if you want trailing collection ratio and bad debt trend data.

The ongoing process isn’t complicated. When an EOB arrives and shows a contractual adjustment, that amount posts to the adjustment account. When a patient balance ages past your collection threshold and gets written off, that amount posts to bad debt expense. Two different events, two different accounts, two different insights.

FAQ: Write-Offs in Dental Bookkeeping

What about write-offs for patients with financial hardship?

Courtesy discounts or financial hardship write-offs should be tracked separately from both contractual adjustments and bad debt. They’re a business decision, not a collection failure or a contractual obligation. Use a third account if your volume of courtesy discounts is material enough to warrant tracking.

Should I write off old patient balances or keep them on the books?

Carrying uncollectible balances on your books inflates your accounts receivable and makes your balance sheet look stronger than it is. If a balance is over 120 to 180 days old and you’ve exhausted your collection process, write it off. Your AR should reflect money you realistically expect to collect, not money you hope to collect.

How does this affect my taxes?

On accrual basis, bad debt is deductible as an expense in the year it’s written off. On cash basis, you never recorded the revenue in the first place (because you didn’t receive it), so there’s no deduction to take. This is one of the areas where accrual accounting gives you a clearer financial picture and, in some cases, a tax benefit. Consult your tax advisor for your specific situation.

P.S. Reciprocity Accounting keeps insurance write-offs and bad debt separated and coded correctly so your books tell the truth about what is owed. See how we can help your practice.