Group code
A group code is the code paired with every adjustment on a remittance that says who bears the amount — the practice, the patient, or the payer.
Updated
A group code is the code attached to every claim adjustment on an electronic remittance advice that assigns financial responsibility for the adjusted amount. It answers one question: now that the payer has taken this money off the charge, who is it owed by — nobody, the patient, or the payer itself?
Four are in current use. CO (contractual obligation) is the amount the provider agreed to write off under contract and may never bill the patient for. PR (patient responsibility) is the amount the patient owes — deductible, coinsurance or copay. PI (payer-initiated reduction) is a reduction the payer applies on its own policy grounds rather than under the contract. OA (other adjustment) covers what fits none of the other three.
The group code always travels with a reason code, in the CAS segment of the remittance. The reason code says why the adjustment was made; the group code says who ends up bearing it. Neither is complete without the other.
In practice
The same dollar amount under two group codes produces opposite outcomes: under CO it is written off, under PR it becomes a patient statement. Posting an amount under the wrong group either bills a patient for money they do not owe — which on a healthcare bill is a compliance problem rather than a service one — or quietly writes off revenue that was collectible.
Group codes are also what make a remittance balance. Every adjustment, whatever its group, comes off the charge alongside the payment: the total charge equals the payment plus all adjustments. The patient-responsibility figure the claim reports separately is a summary of the PR-group adjustments, not an extra deduction on top of them — treating it as a third term double-counts the patient's share and reports an imbalance on a claim that is fine.
A zero payment is not automatically a denial. A claim can be allowed in full and pay nothing because the whole allowed amount fell to a patient who has not met their deductible. What distinguishes that from a denial is the group code on the adjustment.
Commonly confused with
- CARC: The CARC states the reason for an adjustment; the group code assigns responsibility for the amount. They appear together and answer different questions.
- Contractual adjustment: A contractual adjustment is the amount written off under a contract — what a CO group code marks. The group code is the label; the adjustment is the money.
- Patient responsibility: Patient responsibility is the balance a patient owes. PR is the group code that marks an adjustment as belonging to it.