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CO-216 Denial Code: Review Organization Findings

CO-216 means the payer adjusted payment based on the findings of a review organization or the payer's own review. A clinical, utilization, or claims review concluded that all or part of the service should not be paid as billed.

Quick facts

Code
CO-216 (CARC 216)
Status
Active In use since January 27, 2008; last modified March 1, 2025.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): The provider is responsible for the adjusted amount, which generally cannot be billed to the patient.
  • PR (Patient Responsibility): Less common. The payer holds the patient responsible, for example when the review found a non-covered service and the patient accepted financial responsibility in advance.
Official description
Based on the findings of a review organization or the payer's findings.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-216 means

CARC 216 means the adjustment is based on the findings of a review organization or the payer’s findings. Someone looked beyond the automated edits, such as a nurse reviewer, a medical director, a peer reviewer, or an outside review organization, and decided the claim should be reduced or denied.

The code tells you that a review drove the decision, but not why. The reason is in the remark codes, the review letter, or the payer’s portal. Treat CO-216 as a pointer to that finding and get the details before you do anything else.

Common causes

  • Medical necessity review concluded the documentation did not support the service or level of care.
  • Level of care review for inpatient stays, such as a finding that observation status was appropriate instead.
  • Coding review that changed or reduced the service billed.
  • Records not supplied or incomplete when the reviewer requested them.
  • Post-payment audit findings leading to an adjustment or recoupment.

How to fix it

  1. Get the review findings in writing. Use the payer’s portal, the letter referenced by remark code N202, or call provider services.
  2. Identify the specific issue: necessity, level of care, coding, or missing documentation.
  3. If records were missing, send them through the payer’s documentation channel as instructed. This may reopen the review without a formal appeal.
  4. If you disagree with the clinical finding, file a reconsideration or appeal with the full record, the payer’s own policy criteria, and a letter from the treating provider that addresses each point.
  5. Ask about peer-to-peer review when the finding was clinical; many payers offer it within a short window.
  6. If the finding was correct, post the adjustment and use it to correct documentation or coding going forward. Do not bill the patient under the CO group.

How to prevent it

  • Document the clinical reason for each service in terms that match the payer’s coverage criteria.
  • Respond to record requests quickly and completely, and track them with due dates.
  • Run internal coding reviews on services that frequently draw payer review.
  • Track review-based adjustments by payer and service; an ERA Analyzer can show whether CO-216 is concentrated in one service line or one reviewer.
  • For inpatient care, apply admission criteria consistently and document the reasoning at the time of the decision.

See how to read CARC and RARC codes for more on using remark codes to find the real reason behind a review adjustment.

Remark codes that may appear with CO-216

  • N10 (Adjustment based on the findings of a review organization/professional consult/manual adjudication/medical advisor/dental advisor/peer review.): Confirms the adjustment came from a review organization, professional consult, manual adjudication, or peer review.
  • M127 (Missing patient medical record for this service.): The review needed medical records that were missing.
  • N202 (Alert: Additional information/explanation will be sent separately.): The review findings will be sent separately; wait for that letter before appealing.
  • CO-50 (These are non-covered services because this is not deemed a 'medical necessity' by the payer.): A medical necessity denial, which is a common outcome of clinical review but a more specific reason.
  • CO-151 (Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.): The review found the documentation did not support the number or frequency of services.
  • CO-226 (Information requested from the Billing/Rendering Provider was not provided or not provided timely or was insufficient/incomplete.): Records requested for the review were not provided or were incomplete.
  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): An attachment is needed before the claim can be adjudicated.

CO-216 FAQ

What review organizations use CO-216?

It can reflect findings from a Quality Improvement Organization, a utilization review vendor, a payer's medical directors, a peer review, or the payer's own claims review. The remark codes and letter usually identify which.

How do I appeal CO-216?

Get the written review findings, identify exactly what was questioned, and respond with medical records or other documentation that addresses those points. Follow the payer's appeal levels and deadlines.

Is CO-216 the same as a post-payment audit?

It can be used for pre-payment or post-payment reviews. If it follows an audit of already-paid claims, it may come with a recoupment.