US Patent 11139016 Read refresh operation

Methods, systems, and devices for read refresh operations are described. A memory device may include a plurality of sub-blocks of memory cells. Each sub-block may undergo a quantity of access operations (e.g., read operations, write operations). Based on the quantity of access operations performed on any one sub-block over a period of time, a read refresh operation may be performed on the memory cells of the sub-block. A read refresh operation may refresh and/or restore the data stored to the memory cells of the sub-block, and be initiated based on the memory device receiving an operation code (e.g., from a host device).