ICD-10 Mapping Tables

About mapping

The term mapping refers to the process of linking or associating concepts from one system to concepts in another system. Mapping tables are useful if data are recorded in one classification but need to be reported in another. They are also useful for determining the comparability of two classifications. In this case, the tables give an insight into the changes made to ICD-10 to create ICD-10-AM. Mapping also highlights differences between different versions of a classification, such as: deleted codes, new codes, expanded or more specific codes.

Maps can be one-to-one maps or one-to-many maps

One-to-one map - a single ICD-10 code maps to a single ICD-10-AM code, for example:

• ICD-10 code C00.0 Malignant neoplasm of external upper lip
  maps to ICD-10-AM code C00.0 Malignant neoplasm of external upper lip
• ICD-10 code B23.1 HIV disease resulting in (persistent) generalised lymphadenopathy
  maps to ICD-10-AM code B23.8 HIV disease resulting in other specified conditions

One-to-many map  - a single ICD-10 code maps to more than one ICD-10-AM code, for example:

• ICD-10 code C91.0 Acute lymphoblastic leukaemia maps to either ICD-10-AM code C91.00 Acute lymphoblastic leukaemia, without mention of remission or ICD-10-AM code C91.01 Acute lymphoblastic leukaemia, in remission

When one-to-many maps exist, it is important to identify which maps are alternative maps and which maps are additive (maps that need to be added together to adequately reflect the ICD-10 code).

ICD-10 to ICD-10-AM mapping tables 

The ICD-10 to ICD-10-AM mapping tables have been created to demonstrate the relationship between the codes in the World Health Organization's ICD-10 (including updates) and the First, Second, Third, Fourth, Fifth, Sixth and Seventh Editions of ICD-10-AM.

The tables represent forward maps of every valid ICD-10 code (including optional fifth character modifiers).

The official WHO updates to ICD-10 have been included in the tables. Therefore, the list of ICD-10 codes in the tables for each new Edition may differ slightly to take account of changes to codes made by the WHO Update Reference Committee.

The forward mapping tables (ie ICD-10 to ICD-10-AM maps) do not include backward maps, that is, lists of the valid ICD-10-AM codes mapped to ICD-10 code/s. Therefore, some ICD-10-AM codes are not included in the tables. For example, O09 Duration of pregnancy was created in ICD-10-AM First Edition, but does not appear in the tables because there is no equivalent concept in ICD-10 code. These mappings can be found at ICD-10-AM to ICD-10 Mappings.

Please see User Guide ICD-10 to ICD-10-AM Map Guidelines for important information about these mapping tables.

There are eight (sets of) mapping tables:

The files are comma delimited text format which should be imported in an application, such as Microsoft Excel or Microsoft Access, for optimal use.

ICD-10-AM to ICD-10 mapping tables 

General information

These tables provide one-to-one mappings to ICD-10 Second Edition for each Australian code each edition of ICD-10-AM (First, Second, Third, Fourth, Fifth and Sixth Editions). It can be assumed that all other ICD-10-AM codes not included in the tables are exactly the same as the codes in ICD-10.

The one-to-one mapping was achieved by recoding the ICD-10-AM concept in ICD-10. In the majority of cases this will result in the ICD-10-AM code being mapped to the code immediately above it in the hierarchy of both classifications (e.g. E10.11 maps to E10.1 in ICD-10). However, sometimes a concept will be coded to a different rubric in each classification. For example, Treacher Collins Syndrome is coded to Q87.04 in ICD-10-AM and Q75.4 in ICD-10 creating what looks like an error in the sequence when viewing the mapping table.

The one-to-one map is sometimes difficult when a concept can map to more than one concept in ICD-10 and should be noted by those using the tables for research purposes. For example, iatrogenic pneumothorax was introduced as J93.2 in ICD-10-AM First Edition and is mapped to J93.8 Other pneumothorax but it could be argued that J95.8 Other postprocedural respiratory disorders is also appropriate. In these cases preference is given to a map within the hierarchy in which the ICD-10-AM code resides (J93.2 maps to J93.8).

Fields included in tables

• ICD-10-AM Code
• ICD-10-AM Code Descriptor
• ICD-10 Map

Values within the "ICD-10 Map" field

Some concepts in ICD-10-AM do not have equivalent concepts in ICD-10 and in those cases the map will be "nil". For example, the ICD-10-AM code O09 Duration of pregnancy has no equivalent in ICD-10.

"Place=" relates to the ICD-10 subdivision for "place of occurrence" of the external cause of injury. The single character subdivision in ICD-10 has been expanded in ICD-10-AM to a full code and therefore maps to the single character subdivision in ICD-10.

"Act =" relates to the ICD-10 subdivision for "activity" of the external cause of injury. The single character subdivision in ICD-10 has been expanded in ICD-10-AM to a full code and therefore maps to the single character subdivision in ICD-10.

Please see User Guide - ICD-10-AM to ICD-10 Map Guidelines for more information about these mapping tables.