This disclosure describes techniques for coding transform coefficients for a block of video data. According to some aspects of this disclosure, a coder (e.g., an encoder or decoder) may map between a code number cn and level_ID and run values associated with a first transform coefficient of the block of video data according to a first technique (e.g., a structured mapping), and map between a code number cn and level_ID and run values associated with a second coefficient of the block using a second technique. According to other aspects of this disclosure, the coder may map between a code number cn and level_ID and run syntax elements using different mathematical relationships, depending on a determined value of the code number cn or the level_ID syntax element. For example, the coder may access a mapping table of a plurality of mapping tables differently, dependent on the determined value.