Denial code CO-7: Procedure inconsistent with gender
The payer thinks the procedure does not fit the patient's recorded sex.
At a glance
| Code | CO-7 (group CO, reason 7) |
| Who owes it | Contractual obligation: The provider must write this off. The patient cannot be billed for it. |
| Type | Coding error |
| Worth appealing? | Usually yes, once the cause is fixed |
How to fix it
- Check the patient's sex on file with the payer.
- Fix demographics or add the right condition code and resubmit.
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Start free for 14 daysFrequently asked questions
What does denial code CO-7 mean?
The payer thinks the procedure does not fit the patient's recorded sex.
How do I fix a CO-7 denial?
1. Check the patient's sex on file with the payer. 2. Fix demographics or add the right condition code and resubmit.
Should I appeal a CO-7 denial?
Usually yes, or send a corrected claim. CO-7 denials are often recoverable once the cause is fixed. Check the payer's appeal deadline (often 60 to 180 days, 120 days for Medicare redeterminations).
Can I bill the patient for CO-7?
No. With group code CO the amount is not the patient's responsibility and must be written off unless it is overturned.
Plain-English summary for billing staff, not the official code text. See x12.org/codes for the official wording, and always follow the payer's own policy.