CARC 182: Procedure Modifier Invalid on Date of Service

What it means

The payer rejected the claim line because the modifier you attached to the procedure code wasn't a valid, recognized modifier for the date you performed the service. This could mean the modifier had been retired, wasn't yet in effect, was mistyped, or simply doesn't exist in the code set the payer uses.

Common causes

A deleted or retired modifier was used after its expiration date
A new modifier was billed before its official effective date
Typographical error in the modifier (e.g., transposed characters)
Modifier not recognized by the specific payer, even if valid in general CPT/HCPCS sets
Outdated billing software or encoder tables that haven't been updated with current modifier lists
Using a modifier that doesn't apply to the specific procedure code it was attached to

How to fix it

Verify the exact date of service and cross-check the modifier against the CMS or CPT modifier list effective for that date
Confirm the modifier was correctly entered without typos
Check whether the payer has specific modifier policies that differ from standard CPT/HCPCS guidance
Update billing software or encoder tools to reflect current modifier tables
Correct the modifier (or remove it if inappropriate) and resubmit the corrected claim
If the modifier was valid, gather documentation showing its validity on the date of service and contact the payer

Appeal / resubmit

If you believe the modifier was valid on the date of service, include a copy of the official CMS or CPT modifier effective-date table showing the modifier was active, along with the original claim and remittance advice. Clearly state the date of service and the modifier code in your appeal letter. If the issue was a data entry error, it's often faster to submit a corrected claim rather than a formal appeal.

Related codes

Frequently asked

Does this mean the procedure code itself was wrong?

No, CARC 182 specifically flags the modifier attached to the procedure, not the base procedure code itself.

Can I just remove the modifier and resubmit?

Only if the modifier wasn't actually needed for accurate billing. If it was necessary to describe the circumstances of the service, use a valid, currently effective modifier instead of removing it.

How do I know if a modifier was valid on a specific date?

Check the official CMS HCPCS/CPT modifier update files or your CPT codebook for effective and termination dates, as modifiers can be added or retired periodically.

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This content is for informational purposes only and does not constitute billing or legal advice. Always verify current payer policies and consult a qualified billing or compliance professional for specific cases.