Small documentation clarification for duplicate `Underlying` and `Contributory_*` cods in `deaths_cause_of_death`

[xm2325]

Hi team,

Thank you for the helpful documentation.

There may be a small ambiguity in docs/curated_assets/deaths_cause_of_death.md.

The page currently says that:

• Underlying comes from S_UNDERLYING_COD_ICD10
• Contributory_* comes from S_COD_CODE_1 to S_COD_CODE_15

However, in the example, the same ICD-10 code appears in both positions for the same death record. For example:

• Underlying = J189
• Contributory_1 = J189

This is a little difficult to interpret clinically. In the MCCD guidance, the underlying cause is the condition that initiated the direct sequence leading to death, while contributory causes are conditions that contributed to death but were not part of the direct sequence:

https://www.gov.uk/government/publications/medical-certificate-of-cause-of-death-mccd-guidance-for-medical-practitioners/guidance-for-medical-practitioners-completing-medical-certificates-of-cause-of-death-in-england-and-wales

Could you please clarify whether it is expected that the same ICD-10 code can appear as both Underlying and Contributory_1 for the same death record in deaths_cause_of_death?
Thanks very much.