You seem to be equating septicemia with bacteremia. The latter is what a positive bacterial blood culture implies. Septicemia is an obsolete ill-defined term, which essentially means “septic infection in the blood”. The “mapping” you are talking about is provided by SNOMED, not us, who decided that septicemia is obsolete and should be supplanted by sepsis. Toxemia and blood poisoning are lay terms that have even less standing.
You may want bring up this discussion in the phenotype working group, in order to add a proper sepsis definition to the phenotype library.