Official CARC description: “This procedure is not paid separately.” Here’s what it actually means, why it fires, and how to get the claim paid.
The line is packaged — into the surgical global, an inpatient payment, or a bundled payment methodology. Sister code of CO 97; the RARC narrows down which packaging rule fired.
Liability group: CO = Contractual Obligation — the provider absorbs it — the amount cannot be billed to the patient. If the denial is wrong, the money is recovered by correcting or appealing the claim, not by balance-billing.
Also written: CO-234, CO234, “denial code 234”, “234 denial code” or “reason code 234” — same CARC, different ERA formatting.
Identify the packaging rule via the RARC and the CPT's status indicators
If separately payable with a modifier (24/25/59/79): corrected claim
If truly packaged: write off — and stop billing the line to save rework
Audit chargemaster/EHR order sets that generate packaged lines
Appeal only with a genuine unbundling story (distinct session/site/problem) and the documentation to prove it — mirror the CO 97 playbook.
Fill in the denial facts — use placeholders, never real patient data (the letter keeps [PATIENT NAME]-style fields so you can merge real details privately). A payer-ready draft with an enclosure checklist comes back in ~20 seconds.
Your appeal letter draft will appear here.
The official CARC description for CO 234 is: “This procedure is not paid separately.” In practice: The line is packaged — into the surgical global, an inpatient payment, or a bundled payment methodology. Sister code of CO 97; the RARC narrows down which packaging rule fired.
Denial code 234 under the CO group (Contractual Obligation) means: This procedure is not paid separately. The number is the reason; the CO prefix decides who is liable — the provider absorbs it — the amount cannot be billed to the patient. If the denial is wrong, the money is recovered by correcting or appealing the claim, not by balance-billing.
Yes. CO 234, CO-234, CO234 and “denial code 234” are the same CARC — clearinghouses, payer portals and PM systems just print it differently. Only the group prefix (CO, PR, OA or PI) changes the meaning, because it changes who has to absorb the amount.
CO stands for Contractual Obligation — the provider absorbs it — the amount cannot be billed to the patient. If the denial is wrong, the money is recovered by correcting or appealing the claim, not by balance-billing.
Appeal only with a genuine unbundling story (distinct session/site/problem) and the documentation to prove it — mirror the CO 97 playbook.