CO 97 Denial Code: Bundled Into Another Service

Official CARC description: “The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated.” Here’s what it actually means, why it fires, and how to get the claim paid.

Contractual Obligation (CO)Fix steps belowFree appeal letter draftNo PHI needed

What CO 97 actually means

The payer bundled this line into another paid service — classic global-period and NCCI-edit territory. The money is recoverable when the service was genuinely separate and you can prove it.

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.

Why CO 97 fires

How to fix CO 97

1

Step 1

Run the pair through the NCCI edits table — check if a modifier is allowed (indicator 1)

2

Step 2

If separate and distinct: corrected claim with modifier 59/XE/XS/XU (or 25 for E/M)

3

Step 3

If inside a global period but unrelated: modifier 24/79 with documentation

4

Step 4

If the payer policy misfired: appeal with records proving separate service

How to appeal it

Highly appealable when the services were distinct: appeal with the op note or visit note showing separate site, separate session or separate problem, and cite the NCCI modifier indicator that permits unbundling.

Draft a CO 97 appeal letter now ↓

Draft the appeal letter

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.

Frequently asked questions

What does denial code CO 97 mean?

The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated. In practice: The payer bundled this line into another paid service — classic global-period and NCCI-edit territory. The money is recoverable when the service was genuinely separate and you can prove it.

Is CO 97 the provider’s write-off or the patient’s responsibility?

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.

Can you appeal a CO 97 denial?

Highly appealable when the services were distinct: appeal with the op note or visit note showing separate site, separate session or separate problem, and cite the NCCI modifier indicator that permits unbundling.

Related denial codes