Aspects of the present disclosure generally relate to methods and apparatus for encoding repetitions of a physical uplink control channel (PUCCH). In some aspects, the disclosed methods or techniques include first determining that a first number of REs of a first PUCCH repetition used for UCI transmission is different than a second number of REs of a second PUCCH repetition used for the UCI transmission. Based on the determination, the UE performs one or more actions to provide a same mother polar code length for generating coded bits for each of the first and second PUCCH repetitions. The UE performs polar code encoding of information bits of the UCI for the first PUCCH repetition and the second PUCCH repetition based on the same mother polar code length. The UE transmits the first and the second PUCCH repetitions including the respective polar-encoded UCI.