On the IRS Form 1095-C, two sets of codes are used for Lines 14 and 16.
Series 1 Codes (Line 14)
These codes provide information about the health coverage offered by the employer, including whether it was a qualifying offer and whether coverage was offered to the employee's spouse and dependents.
Includes codes: (1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L, 1M, 1N, 1O, 1P, 1Q, 1R, 1S, 1T, 1U)
Read more about 1095-C Codes.