National Vital Statistics System
Comparability of Cause-of-death Between ICD Revisions
Cause-of-death titles change from time-to-time. This reflects the periodic revisions to the classification (the International Classification of Diseases (ICD-10, ICD-9, and earlier revisions) used to show cause of death. The classification is revised to incorporate and capture changes in medical knowledge. The revisions, in some instances, do create breaks in the comparability of a cause of death between two years.
Studies of the comparability between revisions of the ICD are routinely done as part of the implementation of a new revision of an ICD. The Hetzel (1997) publication [PDF - 591 KB] lists comparability study reports that should be examined in connection with trend analyses that cross ICD revisions. The key measure in a comparability study is a comparability ratio that represents the net effect of the new revision on cause-of-death statistics.
Source documents for the tables shown include unpublished worktables from CDC/National Center for Health Statistics, National Vital Statistics System, Mortality data and CDC/NCHS publications.
Reports on the comparability of cause-of-death classification between:
- ICD-9 and ICD-10 [PDF - 337 KB]
- ICDA-8 and ICD-9 [PDF - 1.9 MB]
- ICD-7 and ICDA-8
- ICD-6 and ICD-7 [PDF - 5.5 MB]
- ICD-5 and ICD-6 [PDF - 5 MB]
- ICD-4 and ICD-5
- Comparability across revisions for selected causes table [PDF - 33 KB]
Downloadable data sets for ICD-9/ICD-10 study:
Division of Vital Statistics
National Center for Health Statistics
3311 Toledo Rd
Hyattsville, MD 20782-2064
- 1 (800) 232-4636
- Contact CDC–INFO