CARC 121 Active

PR-121: Indemnification Adjustment

TL;DR

Patient responsibility — review the adjustment and determine if the patient truly owes this amount.

Action
Review & Decide
Who Pays
Patient
Appeal
No
Patient Impact
Direct Financial
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does PR-121 Mean?

With PR (Patient Responsibility), the CARC 121 adjustment for indemnification adjustment shifts the financial impact to the patient. Before billing the patient, verify that the denial reason is valid. if the underlying issue can be corrected, resubmit the claim first to potentially eliminate the patient's liability.

CARC 121 appears on a remittance when the payer applies an adjustment for indemnification adjustment. Review the group code and any accompanying RARC codes to understand the full context of this adjustment.

Common scenarios that trigger this adjustment include: the payer determined the service is not covered, but the provider is held harmless (indemnified) and neither the provider nor the patient is liable for the charges; Medicare's limitation of liability provisions protect the provider from financial responsibility when the provider did not know and could not reasonably have been expected to know that the service would not be covered; A service that does not require an ABN was determined to be non-covered, and the limitation of liability protects the provider from the financial loss. The group code paired with CARC 121 determines who bears the financial responsibility — OA indicates a coordination of benefits or other payer adjustment, CO places it on the provider as a contractual obligation, PR shifts it to the patient.

How to Resolve

  1. Review the adjustment Examine the PR-121 adjustment and any RARC codes to understand the basis for the patient responsibility.
  2. Verify the adjustment is correct Confirm the PR designation and amount are appropriate based on the patient's plan benefits.
  3. Appeal if incorrect If the adjustment appears incorrect, file an appeal with supporting documentation.
  4. Collect from the patient if valid If the adjustment is confirmed correct, generate a patient statement and follow standard collection procedures.
Do Not Appeal This Code

Indemnification Adjustment grouped under PR places the financial responsibility on the patient. The specific reason depends on the context of this adjustment — review any accompanying RARC codes for detail. Because this represents a placement of responsibility rather than a coverage denial, an appeal isn't the right action; verify the placement is correct before billing the patient.

How to Prevent PR-121

Also Filed As

The same CARC 121 may appear with different Group Codes:

OA-121 CO-121

Related Denial Codes

PR-13 — Date of Death Precedes Date of Service PR-14 — Date of Birth Follows Date of Service PR-19 — Workers' Compensation Claim PR-20 — Liability Carrier Responsible PR-21 — No-Fault Carrier Responsible

Sources

  1. https://www.cms.gov/medicare/claims-appeals/organization-determinations
  2. https://www.aapc.com/resources/claim-adjustment-reason-code-carc
  3. https://www.mdclarity.com/denial-code/121
  4. Codes maintained by X12. Visit x12.org for official definitions.