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CO-B2 Denial Code (Deactivated): Covered Visits

CO-B2 reported the number of covered visits on a claim. It was informational rather than an adjustment reason, and X12 deactivated it without naming a replacement.

X12 deactivated CARCB2 on October 16, 2003. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Code: CO-B2 (CARC B2)
Status: Deactivated StoppedOctober 16, 2003 (in use since January 1, 1995).
Code set: Claim Adjustment Reason Codes (CARC)
Group codes: CO (Contractual Obligation): Informational only; no dollar liability attached.
Official description: Covered visits.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-B2 meant

CARC B2 simply stated how many visits on the claim were covered. It paired naturally with B1, which reported the visits that were not covered. Together they helped providers of recurring services track how a claim’s visits were treated.

What replaced it

Nothing replaced it. The paid lines on a modern remittance already show which visits were covered. The active codes in this area explain unpaid visits instead: CO-B1 for non-covered visits, PR-119 when a visit or benefit maximum has been reached, and CO-B14 when only one visit per physician per day is payable.

If you still see CO-B2

It is a relic of pre-2003 remittance formats. If it appears in a historical data set, treat it as a statistic. It should not generate a write-off. If a converted record shows a dollar amount under CO-B2, confirm it against the payment lines before posting anything.

CO-B1 (Non-covered visits.): Non-covered visits, the active counterpart.
PR-119 (Benefit maximum for this time period or occurrence has been reached.): Benefit maximum for this time period or occurrence has been reached.
CO-B14 (Only one visit or consultation per physician per day is covered.): Only one visit or consultation per physician per day is covered.

CO-B2 FAQ

Why was a covered-visit count removed?

Reason codes explain adjustments. A count of covered visits does not explain any change in payment, so it did not belong in the list.

How do I track covered visits now?

From the paid service lines on the remittance, and through the payer's benefit or authorization records for visit limits.

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