CO-49CO group · Benefit

CO-49 denial code: routine exam or screening service

CO-49 is the denial where federal law most often answers the payer directly.

CO-49 fires where a payer treats a service as a routine examination or screening and excludes it. The critical question is whether the service is one the Affordable Care Act requires to be covered without cost sharing.

What CO-49 means

The ACA requires non-grandfathered plans to cover preventive services recommended by the U.S. Preventive Services Task Force at grade A or B, and certain other recommended services, with no cost sharing when delivered in network. A screening that carries such a recommendation is not merely coverable — it is mandated, and a denial of it is answered with the mandate rather than with medical necessity. Where the service is diagnostic rather than screening, the coding is what establishes that.

Why CO-49 fires

  • The service carries an ACA preventive mandate the plan did not apply.
  • A diagnostic service was coded as screening, or the reverse.
  • The plan is grandfathered and the mandate does not reach it.
  • Frequency exceeded the recommended screening interval.

Is CO-49 worth appealing?

Often worth appealing

Establish which it is. If the service carries a grade A or B recommendation, cite the mandate and the requirement of no cost sharing in network. If it was diagnostic, the coding and the indication are what correct it.

How to resolve or appeal CO-49

  1. 1

    Check the recommendation

    Whether the service carries a grade A or B preventive recommendation for this patient's age and risk.

  2. 2

    Cite the mandate

    Preventive coverage without cost sharing is a legal requirement for non-grandfathered plans, not a coverage argument.

  3. 3

    Correct diagnostic coding where that is the issue

    A diagnostic service coded as screening is fixed rather than appealed.

CO-49 — frequently asked

What makes a service ACA-mandated?
A grade A or B recommendation from the U.S. Preventive Services Task Force, among other recommended categories. Those must be covered without cost sharing when delivered in network by a non-grandfathered plan.
What if a screening becomes diagnostic?
A polyp found during a screening colonoscopy is the classic case, and federal guidance addresses it. The service should not lose its preventive status because of what it found.

Related guides

CO-96 · BenefitCO-204 · BenefitCO-50 · Medical necessity

Sources

Reason-code meanings are paraphrased from the X12 Claim Adjustment Reason Code list for plain-language reference; they are not reproduced verbatim. This is general information, not legal, coding, or medical advice — always confirm against the payer's remittance and policy.

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