Table 3: GEMS Text File Examples Diagnosis Forward Mappings Diagnosis Backward Mappings 9cm to 10cm gem.txt 10cm to 9cm gem.txt ICD9CM ICD10CM ICD10CM ICD9CM Flags 0019 A009 00000 A009 0019 00000 0020 A0100 10000 A0100 0020 10000 0021 A011 00000 A0101 0020 10000 As seen in the examples in 2 and Table 3, these GEMs files provide flags, or information necessary to extract and use the code pairs for each end user’s specific need. The flags indicate the type of match found for each code pair. The first three flags are described below and also represented within Table 4. Approximate flag: indicates if the source and target entries are considered equivalent (a 1 indicates equivalence and a 0 indicates approximate). No map flag: a 1 indicates the code in the source system is not linked to any code in the target system. Combination flag: indicates whether or not multiple target system codes are required to satisfy the full meaning of the mapped code from the source system [9]. When the combination code is turned on (set to 1), the two last fields after the flags are used. These fields represent the scenario and choice list fields and allow the user to collate entries with a combination code. Table 4: GEMs Flags and Descriptions Approximate No Map Meaning [Flag] [Flag] Combination [Flag] No one code in the target system expresses 1 0 0 the same essential meaning as the code in the source system The source and target codes are considered 0 0 0 equivalent More than one code in the target system is 1 0 1 required to satisfy the full equivalent meaning of a code in the source system A code in the source system is not linked to 0 1 0 any code in the target system Two additional flags provide context to the combination flag: Scenario flag: scenario designates one variation of the meaning of the source system diagnosis “A as specified in a combination code” (GEMS documentation and User’s Guide) Choice List: scenario is subdivided into two or more choice lists of codes…these are the codes “A that must be linked together as a unit in an applied mapping to satisfy the equivalent meaning of the combination code in the source system. A choice list contains one or more codes in the target
Table 3: GEMS Text File Examples Diagnosis Forward Mappings 9cm to 10cm gem.txt Diagnosis Backward Mappings 10cm to 9cm gem.txt ICD9CM ICD10CM ICD10CM ICD9CM Flags 0019 A009 00000 0020 A0100 10000 0021 A011 00000 A009 0019 00000 A0100 0020 10000 A0101 0020 10000 As seen in the examples in 2 and Table 3, these GEMs files provide flags, or information necessary to extract and use the code pairs for each end user’s specific need. The flags indicate the type of match found for each code pair. The first three flags are described below and also represented within Table 4. Approximate flag: indicates if the source and target entries are considered equivalent (a 1 indicates equivalence and a 0 indicates approximate). No map flag: a 1 indicates the code in the source system is not linked to any code in the target system. Combination flag: indicates whether or not multiple target system codes are required to satisfy the full meaning of the mapped code from the source system [9]. When the combination code is turned on (set to 1), the two last fields after the flags are used. These fields represent the scenario and choice list fields and allow the user to collate entries with a combination code. Table 4: GEMs Flags and Descriptions Meaning Approximate [Flag] No Map [Flag] Combination [Flag] No one code in the target system expresses the same essential meaning as the code in the source system 1 0 0 The source and target codes are considered equivalent 0 0 0 More than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system 1 0 1 A code in the source system is not linked to any code in the target system 0 1 0 Two additional flags provide context to the combination flag: Scenario flag: “A scenario designates one variation of the meaning of the source system diagnosis as specified in a combination code” (GEMS documentation and User’s Guide) Choice List: “A scenario is subdivided into two or more choice lists of codes…these are the codes that must be linked together as a unit in an applied mapping to satisfy the equivalent meaning of the combination code in the source system. A choice list contains one or more codes in the target
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