Dual coding, in cause-of-death statistics, is the assignment of two codes to a death; it can have different meanings:
- in ICD-10 Vol. 2 (page 22), dual coding refers to dagger-asterisk combinations and other optional dual coding;
- in the context of bridge coding, it refers to the process of coding data twice for two different classifications or methods in order to determine comparability;
- it can also refer to the independent manual coding of the same deaths, using the same classification methods, by different coders and/or different cause-of-death statistics offices; this is usually an exercise in measuring the quality and consistency of cause-of-death coding.