CO-35CO group · Benefit

CO-35 denial code: lifetime benefit maximum has been reached

CO-35 is another code that federal law has largely retired, and its appearance is often the error rather than the answer.

CO-35 denies because a lifetime maximum has been exhausted. The Affordable Care Act prohibits lifetime dollar limits on essential health benefits, which makes the nature of the service and the plan type decisive.

What CO-35 means

The prohibition covers essential health benefits, so a lifetime limit on a category within them is impermissible on a compliant plan. Limits can persist lawfully on benefits outside that definition and on products outside the framework. What this means practically is that a CO-35 on a core medical service is worth challenging as a matter of law before anything clinical is considered.

Why CO-35 fires

  • A lifetime dollar limit was applied to an essential health benefit.
  • The plan is not subject to the prohibition and the limit is lawful.
  • The accumulator is wrong and the maximum was not actually reached.
  • A limit on a non-essential benefit is being applied to an essential one.

Is CO-35 worth appealing?

Often worth appealing

Test the legality first. On a compliant plan, a lifetime dollar limit on an essential health benefit is prohibited, and that argument does not require clinical support.

How to resolve or appeal CO-35

  1. 1

    Establish the plan type

    Whether the prohibition on lifetime limits reaches it.

  2. 2

    Identify the benefit category

    Essential health benefits cannot carry lifetime dollar limits on a compliant plan.

  3. 3

    Ask for the accumulator

    Where the limit is lawful, verify it was actually reached before conceding.

CO-35 — frequently asked

Are lifetime maximums still allowed?
Not as dollar limits on essential health benefits in ACA-compliant coverage. They persist on some non-essential benefits and outside that framework.
What about visit limits?
Non-dollar limits are treated differently and can be permissible, though parity rules constrain them sharply for behavioural health.

Related guides

CO-149 · BenefitCO-119 · BenefitCO-96 · Benefit

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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