Comparing Causes of Death between Years: Accounting
for the Change from ICD-9 to ICD-10
The International Classification of Diseases (ICD) is a system
designed to promote international comparability in the classification of
disease, including reporting causes of death on the death certificate.
Titles for each cause of death and the exact diseases included in each
cause are revised periodically in order to incorporate advances in medical
knowledge. The latest change in ICD codes was implemented for deaths that
occurred in 1999 and thereafter.
ICD revisions can create breaks in the comparability of trend data for
some causes of death, when classification and coding changes move a
disease or condition from one category to another. The comparability ratio
for a given cause of death is a measure of the net effect of a new ICD
revision on the number of deaths attributed to that cause.
The table accessible below lists the ICD-10/IDC-9 comparability ratios
for 113 selected causes of death. These ratios provide a way to account
for the effects of coding and classification changes from ICD-9 to ICD-10,
so that deaths from specific causes can be compared across years. For each
cause of death, the table also shows:
Actual data for 1999 (number of deaths coded using ICD-10),
Actual data for 1998 (number of deaths coded using ICD-9), and
Comparability-modified data for 1998 (number of deaths in 1998
modified by applying the comparability ratio).
Access the Table (PDF, 45 KB)
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September 05, 2012