diagnoses_icd.sequence, according to the documentation:
provides the order in which the ICD diagnoses relate to the patient. ICD diagnoses are ordered by priority.
Does the order really matter aside from the primary diagnosis (i.e. does the
diagnoses_icd.sequence matter when
diagnoses_icd.sequence > 1)?
diagnoses_icd.sequence has values that range from 1 to 39:
SELECT distinct(sequence), COUNT(*) FROM mimiciii.diagnoses_icd GROUP BY sequence ORDER BY sequence ASC ;