For example, for AMI (Myocardial infarction) there are following combinations (query GROUP BY):
AMI     ANES
AMI     EM
AMI     MED
AMI     PL
AMI     RAD
AMI     SAS
AMI     SCS
AMI     SDS
AMI     SGS
AMI     SIS
AMI     SMS
AMI     SNS
AMI     SRS
PGs {ANES, EM, MED, PL, RAD, SCS (SURGERY-CARDIOVASCULAR SYSTEM)} are OK. But what are other ProcedureGroups to AMI: SAS (SURGERY-AUDITORY SYSTEM), SGS (SURGERY-GENITAL SYSTEM) etc.? Some other PrimaryConditionGroups have similar mismatches.