Denial codes / CO-131
Denial code 131CO-131: Claim-specific negotiated discount
Claim specific negotiated discount.
What to doNormal PPO write-off (check the amount)
Recoverable?Usually not
The letters in front matter. CO means the office can't bill the patient for the amount; PR means the patient may owe it; OA and PI are other adjustments. Some numbers can appear with more than one, so read both parts.
Why dental offices see it
- A discount the insurer applied under its agreement for this claim (for example a negotiated or leased-network rate).
What to do
- Read the EOB: this is a reduction, not a denial, and not money the insurer owes.
- Check the discount matches your agreement with the insurer or network (verify).
- If it doesn't, ask the insurer which agreement it used and to reprocess under yours.
Stop it next time
Keep a copy of each network or discount agreement you signed, so a discount you didn't agree to stands out.
How many CO-131 claims are in your report? The free check (free account) counts them, ranks them by dollars and deadline and drafts the letter. It runs in your browser; nothing is uploaded.
Plain-English paraphrase; the official code list is maintained by X12. Insurer rules vary; check the insurer's provider manual. Not legal advice.