Harm grading for anaphylaxis and severe drug reactions

Good morning, I am hoping to gain some insights into how other organisations assess the level of harm for incidents of anaphylaxis or severe drug reactions? I work within a private homecare setting with the vast majority of our patients receiving administration of medication via a clinician - ranging from antibiotics to chemotherapy. Currently, within our organisation incidents reporting a severe drug reaction/anaphylaxis are graded as moderate-severe harm. There has been some discussion recently around the harm grading of these incidents, and I was hoping to seek guidance from external patient safety colleagues as to how their organisations assess the harm level for these types of incidents? Many thanks