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The Mapping Specialist Map Terminologist will review the WHO ICD-10 Alphabetical Index to Diseases and Nature of Injury Volume 3 to identify any essential modifiers which represent SNOMED CT concepts that are descendants of: a) the source concept to be mapped, or b) the source concept etiology SNOMED CT code when dagger and asterisk guidance requires a separate target for cause of the disorder. The Mapping Specialist Map Terminologist will add new Map members with the associated target specific to the alpha reference as context dependent maps with a mapRule.

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Upon reviewing the WHO alphabetic index, the Mapping Specialist Map Terminologist notes the following codes:

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Upon reviewing the WHO alphabetic index, the Mapping Specialist notes Incisional hernia Map Terminologist notes Hernia, incisional has a reference to "see Hernia, ventral". To determine the target, the Mapping Specialist Map Terminologist follows the 'see' reference and checks under "Hernia, ventral". ICD-10 code K43.0 is listed under Hernia, ventral, with, obstruction. In addition, there are essential and nonessential modifiers to consider:

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Mapping for concepts of poisoning and overdose will require analysis of the Alphabetic Index's Table of Drugs and Chemicals. This table organizes drugs or chemicals along with the corresponding codes for adverse situations including accidental events, intentional self-harm, poisoning of undetermined intent, and adverse effects in therapeutic use. This table also may include essential modifiers which require attention for possible exclusion rules. For example, when mapping the SNOMED CT source concept

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In this case, the default target code for mapping of Antidepressant poisoning is T43.2 for mapGroup one and X41 for mapGroup two based upon WHO advice to assume an accident accidental when intent of poisoning is unspecified. Note that required modifiers are identified for this map for agents MAO inhibitors, triazolpyridine, tricyclic and tetracyclic antidepressants. 

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