When using Z codes whether Z79.82 Long term use of aspirin or Z88.0 Allergy status to penicillin, what is the appropriate use and what all is suggested documentation? In reviewing ICD10 Guidelines, I don't see anything specific? Once an allergy is established, are these ICD10 codes used for each visit? Same with Long term use of aspirin or only if it's been discussed, pertinent to visit and documented in detail?