Methods and apparatuses for retransmissions using cross-block check blocks are described. The cross-block check blocks may be generated using code blocks selected from across two or more transport blocks. A transmitter node transmits an initial transmission of a first data block having a first plurality of code blocks, and a second data block having another plurality of code blocks. The transmitter node transmits a retransmission that includes at least one cross-block check block from a first set of cross-block check blocks generated using a first partition of code blocks from the first data block and a first partition of code blocks from the second data block. The retransmission also includes at least one cross-block check block from a second set of cross-block check blocks generated using a second partition of code blocks from the first data block and a second partition of code blocks from the second data block.