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CARC denial code

Indemnification Adjustment for Outstanding Member Responsibility

Official description: Indemnification adjustment - compensation for outstanding member responsibility.

What it means

This code shows up when a payer applies an adjustment to account for an amount it is covering on behalf of the patient (member) that would otherwise have been the patient's financial responsibility. In practice, it means the payer is offsetting or 'making whole' a balance that was originally billed to the member, rather than denying the claim outright.

Common causes

  • A plan-level indemnification or hold-harmless provision requires the payer to cover a portion of the member's cost-share
  • Correction of a prior claim where the member was incorrectly billed and the payer is now reconciling that amount
  • Coordination of benefits or secondary payer processing where the payer absorbs part of the remaining member liability
  • Contractual or regulatory requirement (e.g., state mandate, network agreement) obligating the payer to indemnify the member for certain costs

How to fix it

  1. Review the remittance advice closely to confirm whether this adjustment increases, decreases, or reclassifies the patient responsibility amount
  2. Reconcile your patient accounting system so the member is not billed for the portion now covered by the indemnification adjustment
  3. Contact the payer's provider services line if the adjustment amount or reasoning is unclear, referencing the specific claim and adjustment code
  4. Check your contract or plan documents for any indemnification clauses that explain when this adjustment is triggered
  5. Update any patient statements or collection activity that may have already gone out based on the original (pre-adjustment) balance

Appeal / resubmit

Because this adjustment typically represents the payer absorbing cost rather than denying payment, a traditional appeal may not be necessary. However, if the adjustment amount seems incorrect or inconsistent with your contract terms, submit a written inquiry or reconsideration request with the original claim, remittance detail, and relevant contract language. Ask the payer to specify the statute, regulation, or contract clause driving the indemnification so you can verify the calculation.

Frequently asked

Does CARC 121 mean the claim was denied?

No. It typically reflects an adjustment where the payer is compensating for an amount that would have been the patient's responsibility, not a denial of the service.

Should I still bill the patient after seeing this code?

Review the adjusted patient responsibility amount on the remittance first. If the indemnification adjustment reduces or eliminates what the member owes, update your billing before sending a statement.

Why would a payer indemnify a member's cost-share?

This can happen due to plan-specific provisions, regulatory requirements, or corrections to prior claims processing where the member was billed in error.

More free billing tools: all denial codes · denial lookup · Medicare fee calculator

This content is for informational purposes only and does not constitute billing or legal advice. Always verify specifics with the payer and your organization's compliance resources.

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