The 2300 Loop CR1 – Ambulance Transport Information segment is “Required on all claims involving ambulance transport services. If not required by this implementation guide, do not send.” The 2300 Loop CR1 segment would always be required when the claim involved ambulance transport services.

The 2400 Loop CR1 – Ambulance Transport Information segment is “Required on ambulance transport services when the information applicable to any one of the segment's elements is different than the information reported in the CR1 at the claim level (Loop ID-2300). If not required by this implementation guide, do not send.” The 2400 Loop CR1 segment is only required when any one of the segments elements is different than the information reported in the 2300 Loop CR1 segment.

Therefore, it would not be compliant with the 5010X222A1 TR3 to send the 2400 Loop CR1 segment without a 2300 Loop CR1 segment.