Mapping between ICD-10-AM 6th and 8th Editions

There are two mapping tables for mappings between ICD-10-AM 6th and 8th Editions.

These are:

  • forward mapping (converting ICD-10-AM 6th Edition into ICD-10-AM 8th Edition codes)
  • backward mapping (converting ICD-10-AM 8th Edition into ICD-10-AM 6th Edition codes).

The mapping tables include:

  • diagnosis/injury codes (clinical code type A, B)
  • procedure/operation codes (clinical code type O)
  • external cause codes (clinical code type E)
  • morphology codes (clinical code type M)
  • other health factors (clinical code type V).

The morphology codes sent to the Ministry do not include the ‘M’ prefix that is used in Australia and the 3M Codefinder software. In addition, morphology codes should not include a fifth digit, which is the behaviour code. This information is gathered by the Ministry of Health from labs and not from hospital discharge records.

Mapping spreadsheets

The two Excel spreadsheets are called:

  • Backwards mapping ICD-10-AM_ACHI 8th to 6th Edition.xls
  • Forwards mapping ICD-10-AM_ACHI 6th to 8th Edition.xls

The files have 23873 (backwards) and 23322 (forwards) rows, and contains the following fields:

  • conversion_type
  • clinical_code_type_from
  • clinical_code_from
  • clinical_code_type_to
  • clinical_code_to
  • comment.

Conversion_type
This indicates whether the mapping is forward or backwards.

  • When the value is 1314 the mapping is forwards from ICD-10-AM 6th Edition to ICD-10-AM 8th Edition.
  • When the value is 1413 the mapping is backwards from ICD-10-AM 8th Edition to ICD-10-AM 6th Edition.

The value of Clinical Coding System ID for ICD-10-AM 6th Edition is 13, and the value of Clinical Coding System ID for ICD-10-AM 8th Edition is 14.

Clinical_code_type_from
This field shows the value of the clinical code type associated with each mapped code for ICD-10-AM 6th Edition when the conversion_type is 1314 and ICD-10-AM 8th Edition when the conversion_type is 1413. The values in this field are:

  • A = diseases/diagnoses
  • B = injury codes
  • E = External cause codes
  • O = procedure/operation codes
  • M = morphology codes
  • V = other health factors.

This field can be used to determine a subset of the mapping codes – eg, to map only procedures/operations choose any rows with an O in the clinical_code_type_from field.

Clinical_code_from
This is the ICD-10-AM 6th Edition code when the conversion_type is 1314 and ICD-10-AM 8th Edition code when the conversion_type is 1413.

Clinical_code_type_to
This field shows the value of the clinical code type associated with each mapped code for ICD-10-AM 8th Edition when the conversion type is 1314 and ICD-10-AM 6th Edition when the conversion type is 1413. The same range of code values are used in this field as are in the clinical_code_type_from field.

Clinical_code_to
This is the ICD-10-AM 8th Edition code when the conversion_type is 1314 and ICD-10-AM 6th Edition code when the conversion_type is 1413.

Comments
The values in this field are Y (yes) and N (no).

N (no) indicates there is no change between ICD-10-AM 8th Edition and the ICD-10-AM 6th Edition codes.

Y (yes) indicates there is a change between ICD-10-AM 8th Edition and 6th Edition codes.

 

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