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CO-30 Denial Code (Deactivated): Eligibility Requirements

CO-30 meant payment was adjusted because the patient had not met an eligibility, spend-down, waiting-period, or residency requirement. X12 deactivated it, and those four situations now each have their own code: 177, 178, 179, and 180.

X12 deactivated CARC30 on February 1, 2006. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Quick facts

Code
CO-30 (CARC 30)
Status
Deactivated StoppedFebruary 1, 2006 (in use since January 1, 1995).
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): Applied when the payer held the provider responsible for the unmet requirement.
  • PR (Patient Responsibility): Applied when the payer indicated the patient was responsible because they did not qualify for benefits yet.
Official description
Payment adjusted because the patient has not met the required eligibility, spend down, waiting, or residency requirements.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-30 meant

CARC 30 was a catch-all for patients who were enrolled but had not yet qualified for benefits. The reasons could be very different: a general eligibility rule, a Medicaid spend-down that had not been reached, a plan waiting period that had not run out, or a residency requirement that was not satisfied. The ERA did not say which.

What replaced it

The code text does not name a replacement, but X12 later created one code for each condition, and these are the natural successors:

If you still see CO-30

You are most likely looking at archived data or a claim from long ago that came back through an audit or reprocessing. Ask the payer which requirement was unmet so you know whether the situation can change.

Spend-down and waiting-period denials are time-bound. Once the patient meets the spend-down or the waiting period ends, later dates of service may be payable, and in some programs the qualifying date can shift. Keep the claim open until you confirm the patient’s status for that date, then either refile or apply the patient-responsibility rules of the program.

  • CO-177 (Patient has not met the required eligibility requirements.): Patient has not met the required eligibility requirements.
  • CO-178 (Patient has not met the required spend down requirements.): Patient has not met the required spend-down requirements, common in Medicaid.
  • CO-179 (Patient has not met the required waiting requirements.): Patient has not met the required waiting period.
  • CO-180 (Patient has not met the required residency requirements.): Patient has not met the required residency requirements.

CO-30 FAQ

What is a spend-down requirement?

Some Medicaid programs require members to incur a set amount of medical expenses before coverage applies for a period. Until that amount is reached, claims can be denied for spend-down, which CO-30 used to cover and CARC 178 covers now.

Is the patient responsible after CO-30?

It depends on the group code the payer used and on the program's rules. If benefits never applied, the patient usually owes the balance, but Medicaid programs may restrict billing members, so check before sending a statement.