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Release data structures for the MAP are compliant with SNOMED CT= Release Format 2 (RF2) datasets as defined in the SNOMED CT Release File Specification. SNOMED CT Release Fil= es relevant to the MAP structures and definitions important to MAP delivera= bles identified below include:
Refere= nce Set (Refset): which is defined as a standard format for mai= ntaining and distributing a set of references to SNOMED CT components= .
Map member: a single Refset MAP data record which assem= bles knowledge-based data required to validate the link between a single SN= OMED CT concept and at most one ICD-10 classification code. The Map member = includes a link to the source SNOMED CT concept identifier, a mapGroup integer, a mapPriority integer= , a mapCategoryId&= nbsp;status concept reference, a mapRule, mapAdvice, and link to at most one mapTarget ICD-10 classification code.
mapGroup= a>: an integer assigned to each set of Map members which are = coordinated to specify one target ICD-10 code for the map, or the null map = if the source concept does not require an additional ICD-10 code for proper= classification. Each mapGroup collates and orders the rules, which are seq= uentially evaluated to yield at most a single target code. The first mapGro= up designates the set of records used to specify the first (primary) target= code. The second mapGroup identifies the set of data records for the secon= d target code. These are repeated as required to specify a complete set of = mapping target codes.
mapPriorit= y: an integer which designates the sequence of run-time Map me= mber processing within each mapGroup. Each data record may include a rule w= hich is designed to be processed in order to provide knowledge-based mappin= g. Only the first Map member meeting the run-time criteria is taken for the= target code within the mapGroup data records.
mapCategor= yId: a SNOMED CT foundation metadata concept identifier which = indicates the process state for run-time use including the editorial status= of the Map member:
There are additional Map Categories that identify editorial process stat= es but are published as a single Map member for the source concept for comp= leteness, auditability and transparency of the MAP:
mapRule= : A machine-processable truth statement created to evaluate to "tr= ue" or "false" at run-time, which determines whether the Map member should = be validated as the correct link to the associated map target for the mapGr= oup being evaluated.
Formatting of the mapRule is specified in Augmented Bacchus Naur Form (A= BNF) in Appendix A but generally is one of three forms:
IFA Concept.id  = ; [=3D VALUE]: a mapRule which evaluates for the existence of one or= more SNOMED CT concept instances including their descendant concepts, or a= n observable and value found in the patient record. The concept is designat= ed by the SNOMED CT Identifier for a clinical finding or observable entity = and the SNOMED CT fully specified name. In the case of rules for age at ons= et of clinical finding or current chronological age, it may include a range= of allowable "VALUES". If such an instance is found in the patient record = at the time of rule evaluation, the rule is evaluated as "true" and the ass= ociated map target is selected for that mapGroup. Otherwise the rule evalua= tes as "false" and the run-time evaluation proceeds to the next Map member = within the mapGroup. The mapAdvice for the record will include a readable s= tatement relating the rule and map target.
m= apAdvice : human-readable textual advice that a softw= are vendor may employ to inform the clinician user or the classification ex= pert during a semi-automated mapping session. The mapAdvice has three compo= nents separated by vertical bar ("|"):