Modifier invalid on the date of service
The modifier on the line was not a valid modifier on the date of service.
CO = Contractual Obligation. The provider owes the difference. The patient cannot be billed for this amount. The same reason code can appear with a different group code; the group decides who may be billed.
Usual causes
- Retired modifier or one that was replaced (for example payer-specific telehealth modifiers that changed).
- Typo in the modifier field.
The fix
Check the modifier list for the date of service, replace or remove it and send a corrected claim.
Appeal or corrected claim?
Corrected claim.
Deadline to watch
Timely filing limit.
Exact limits are in your payer contract or provider manual. When in doubt, send the correction or appeal this week.
CO-182 in short
What does CO-182 mean?
The modifier on the line was not a valid modifier on the date of service. The official X12 text reads: "Procedure modifier was invalid on the date of service."
What usually causes a CO-182 denial?
Retired modifier or one that was replaced (for example payer-specific telehealth modifiers that changed). Typo in the modifier field.
How do I fix CO-182?
Check the modifier list for the date of service, replace or remove it and send a corrected claim.
Should I appeal CO-182 or send a corrected claim?
Corrected claim. Corrected claim.
What deadline applies to CO-182?
Timely filing limit.