Denial codes / CO-151
Denial code 151CO-151: Too many services (frequency)
Information submitted does not support this many services (frequency).
What to doAppeal with evidence
Often recoverableYes, when worked
The letters in front matter. CO means the office can't bill the patient for the amount; PR means the patient may owe it. The same number can appear with either, so read both parts.
Why dental offices see it
- More services than the plan allows in a period (for example extra perio maintenance).
What to do
- Check the plan's frequency rule and the prior service date.
- Appeal only with documented clinical need for the extra service.
Stop it next time
Check service history before scheduling frequency-limited procedures.
How many CO-151 claims are in your report? The free check 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.