# Choosing Initial Target Codes

Once the map specialist has reviewed and understands the SNOMED CT source concept to be mapped, they employ the ICD-10 Alphabetic Index to search and select candidate ICD-10 target codes for the map. They research the Fully Specified Name from the SNOMED CT source concept searching the best textual references in the Alphabetic Index that capture the meaning of the SNOMED CT concept. The WHO Alphabetic Index lists multiple term modifiers that can be considered as specifications or qualifiers of the primary term, and the map specialist will search through the specifications looking for the relevant terms of interest.

This review may identify matching ICD-10 terms or may require searching through related cross-references. Two types of cross-reference in the ICD-10 Alphabetic Index must be considered before assignment of a tentative target code(s). These are: '***See***' and '***See also***'.

{% columns %}
{% column %}
***See***

An explicit direction to look elsewhere in the index, and no codes are found alongside this reference. The Map Terminologist will review the directed descriptions in searching for target candidates.
{% endcolumn %}

{% column %}
***See also***

This cross reference instructs the user to look elsewhere if the detail they are looking for cannot be determined from the current reference.
{% endcolumn %}
{% endcolumns %}

#### Example 1

{% hint style="info" %}
**Nodule(s), nodular**\
\- subcutaneous — *see Swelling, localized*
{% endhint %}

#### Example 2

{% hint style="info" %}
**Hyperbilirubinemia**\
\- neonatal (transient) — *see also Jaundice, fetus or newborn* P59.9
{% endhint %}

When a code is given alongside the '***See also***' instruction, as in the above example, it may or may not be necessary to look under the alternative term.

When no code is given, it is essential for the user to look under the alternative lead term.

The map specialist will create preliminary map members employing the candidate target records resulting from these searches. If specializations are noted in targets selected from the alphabetic index and there exist sub-headings for the term selected, these will be considered for exclusion rules as documented in section [6.9. Mapping Context - Exclusions, Alpha Modifiers and Co-morbidities](/snomed-ct-specifications/snomed-ct-to-icd-10-map-specification/mapping-heuristics/6.9-mapping-context-exclusions-alpha-modifiers-and-co-morbidities.md).

For source concepts that represent examples of poisonings caused by drugs or chemicals, the map specialist will use Section III of the Alphabetic Index, the Table of Drugs and Chemicals, to research the default maps and essential modifiers.

The map specialist will proceed from this source concept analysis to research the tabular guidance for the candidate targets and evaluate for issues of mapping context which may alter the Map members.

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