1. A computer-implemented method of grouping health-related claim records, comprising: storing in at least one electronic database: a plurality of health-related claim records for at least one patient; and a plurality of predefined anchor categories, each predefined anchor category including a plurality of clinically related procedures and at least one anchor procedure having an associated time window that is divided into a first sub-window portion and a second sub-window portion different from the first sub-window portion, wherein the first sub-window portion has an associated first claim analysis process and the second sub-window portion has an associated second claim analysis process; and using a computer processor to: identify an anchor procedure from the stored claim records having the associated time window; identify claim records falling within the associated time window using the date of service associated with each claim record; assess the identified claim records falling within the first sub-window portion of the time window using the first claim analysis process to determine whether the identified claim records have a first level of relationship with the anchor procedure in which the claim records generally relate to the predefined anchor category associated with the identified anchor procedure; assess the identified claim records falling within the second sub-window portion of the time window using the second claim analysis process to determine whether the identified claim records have a second level of relationship with the anchor procedure in which the claim records generally relate to the predefined anchor category associated with the identified anchor procedure, and in which the second claim analysis process further analyzes the claim records to confirm their relationship to the predefined anchor category; group the identified claim records respectively having the first and second level of relationship with the anchor procedure into a procedure episode group; and store the procedure episode group of claim records in the electronic database.