Which information is NOT required to be communicated to the receiving hospital during a HAZMAT incident?

In the context of a HAZMAT incident, the critical information that must be communicated to the receiving hospital primarily revolves around ensuring patient safety and proper treatment. This includes details about the chemical involved, such as its name and the DOT reference number, which are essential for the hospital to understand the type of exposure and potential hazards. The decontamination method is also significant, as it informs the hospital about the necessary precautions and handling required for the patient.

While a patient's medical history may provide valuable background information for treatment, it is not imperative in the immediate context of a HAZMAT incident. The primary concern is to relay the specifics of the chemical exposure and the appropriate response protocols. Thus, the patient's medical history is rightly identified as information that is not strictly required for communication during such an incident.