When the remittance advice was received, office visit 99213 was paid, but the B12 injection was denied. The denial was coded as follows: Claim Adjustment Group Code (CAGC) CO and Claim Adjustment Reason Code (CARC) 50.
Respond to the following in approximately 175–350 words total:
1. What is CAGC CO?

2. What is CARC 50?