Your Dental EOB ‘Write-Off’ Is Not a Discount: How to Read It in 2026
· How-To Guides · 2 min read
August is when a lot of patients finally sit down with a stack of EOBs from spring treatment. The confusing line is almost always contractual write-off. Offices sometimes describe it as a discount. Insurers describe it as the amount they will not allow. Those sentences are both true and still mislead you about what you owe.
Three columns, one decision
On a typical 2026 PPO EOB you will see something like: submitted fee, allowed amount, plan paid, patient portion. The write-off is submitted minus allowed. If the dentist is in-network, they generally cannot bill you the write-off. Your job is the patient portion, plus anything the plan excluded (downgrade, frequency, missing-tooth, waiting period).
If the office quoted “insurance will cover 80% of a crown” they usually meant 80% of the allowed amount after deductible, not 80% of the poster on the wall.
Where quotes break
- Downgrades. Posterior composite billed, plan pays amalgam alternate. The difference can land on you unless the office warned you in writing.
- Frequency. Periodontal maintenance vs adult prophy are different codes. A second “cleaning” in six months may deny even if clinically indicated — see perio maintenance vs regular cleaning.
- Pre-auth vs payment. A pre-determination that looks generous can still change if the tooth needs a different code after prep.
Ask before the appointment, not after the crown
- Which CDT codes will you submit, and have we used this year’s frequency for those codes?
- Will you send a pre-determination for this crown/onlay, and will I see the downgrade language in writing?
- If I am out-of-network, do you balance-bill the difference between submitted and allowed?
Compare practices in cities or near you, then confirm benefits with the insurer using the same codes the office plans to bill. A directory score does not replace an EOB.
Frequently Asked Questions
- Is a PPO write-off money I saved?
- It is the difference between the office’s usual fee and the contracted allowed amount. You were never going to be billed the full usual fee if the office is in-network. It is not a coupon stacked on top of insurance.
- Why is my portion higher than the office quoted?
- Common causes: frequency limits (two prophies per year already used), missing tooth clauses, waiting periods, downgrades (composite paid at amalgam), or the plan paying against an outdated fee schedule. Ask for the CDT codes submitted.
- Should I pre-authorize a crown?
- For anything over a few hundred dollars, yes. A pre-determination is not a guarantee, but it surfaces downgrades and waiting periods before the tooth is prepped.
- What if the office and the EOB disagree?
- Compare CDT codes, tooth numbers, and dates. Ask the office which code they billed and whether they will appeal a downgrade. Do not pay a ‘balance’ you cannot map to a line on the EOB.