1095A

The 1095A Form I received has amounts in col. A but Col B and C show Zeros.  I entered Col. A information   and looked up and entered the information in col B.the (Second lowest cost  silver plan premiums).  Is Col C equal to the difference between Col A and Col B?  I had market place health ins. for the first nine months of 2023 but went on medicade in the last three months of 2023.