CARC 201 Active

CO-201: Patient Responsibility via Set-Aside Arrangement

TL;DR

CO is unusual for this code. Contact the payer to verify the group code assignment.

Action
Review & Decide
Who Pays
Provider
Appeal
No
Patient Impact
None
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 CO-201 Mean?

With CO (Contractual Obligation), the set-aside arrangement results in a contractual adjustment. This is unusual for CARC 201 since the code is designed for patient responsibility. Contact the payer to clarify the group code assignment.

CARC 201 indicates that the patient has a formal set-aside arrangement — most commonly a Medicare Set-Aside (MSA) from a workers compensation or liability settlement — that designates funds for specific future medical expenses. The billed service falls within the scope of that set-aside, meaning the patient (or the set-aside fund) is responsible for paying rather than the insurer.

Set-aside arrangements are created during settlement negotiations to protect Medicare's interests. When a patient receives a settlement for an injury, a portion of the settlement funds is set aside to cover future medical expenses related to that injury. Medicare will not pay for those services until the set-aside funds are exhausted. This code restricts usage to the PR group code only, as it specifically designates patient financial responsibility.

How to Resolve

  1. Verify the group code Contact the payer to confirm whether CO is correct — CARC 201 is typically restricted to PR.
  2. Review the set-aside arrangement Determine if the set-aside arrangement terms support a contractual adjustment.
Do Not Appeal This Code

Patient Responsibility via Set-Aside Arrangement recorded under CO is a contractual obligation — the provider absorbs this amount per the payer agreement. Without an error in how the contract was applied, appeals don't apply. Review the accompanying RARC codes for context and accept the adjustment when the contract terms were applied correctly.

How to Prevent CO-201

Also Filed As

The same CARC 201 may appear with different Group Codes:

PR-201 OA-201

Related Denial Codes

CO-3 — Co-payment Amount CO-85 — Patient Interest Adjustment CO-100 — Payment Made to Patient/Insured CO-101 — Predetermination: Anticipated Payment CO-105 — Tax Withholding Amount

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://www.mdclarity.com/denial-code/201
  3. https://portal.ct.gov/-/media/ohs/health-it-advisory-council/apcd-advisory-group/data-submission-guide-workgroup/meeting-materials/6-30-22/carc-codes_final.pdf
  4. Codes maintained by X12. Visit x12.org for official definitions.