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This variable is contained in the following files: Master Beneficiary Summary File (MBSF): National Death Index (NDI) segment
Short SAS Name
SAS Name

This field identifies the eighth underlying causes of death code as listed by the certifier of death (formatted but not audited)


For decedents 1999-2006 there are up to 8 underlying conditions on the NDI record and for 2007-2016 there are up to 20 underlying conditions (ENTITY_COND_1 - ENTITY_COND_20). Researchers wishing to obtain this NDI segment of the MBSF must obtain an additional approval beyond the CMS DUA. There is another version of the underlying cause of death conditions that is edited and audited by the National Center for Health Statistics (NCHS; see RECORD_COND_1 - RECORD_COND_20). 


Centers for Disease Control and Prevention (CDC) National Death Index (NDI)

Each condition takes 7 positions in the record Position1: Part/line number on certificate
CodeCode value
Part I, line 1 (a)
Part I, line 2 (b)
Part I, line 3 (c)
Part I, line 4 (d)
Part I, line 5 (e)
Part II
Position 2: Sequence of condition within part/line Code range: 1-7
Position 3-6: Condition code (See ICD-10 codes) Whenever there is a 4-position code, there is always an implied decimal after the 3rd position.
Position 7: Nature of Injury flag
CodeCode value
all other codes (always 0 for ICD-10 codes; 1999 forward)