Poisoning by other viral vaccines, undetermined, init encntr

This code signifies an adverse reaction to a viral vaccine where the intent (e.g., accidental, intentional self-harm) cannot be determined. It specifically applies to poisoning by viral vaccines other than those explicitly classified elsewhere, such as influenza or COVID-19 vaccines. The "initial encounter" indicates that the patient is receiving active treatment for the poisoning.

Use this code when a patient presents with symptoms of poisoning following the administration of a viral vaccine, and the clinician cannot ascertain whether the poisoning was accidental, intentional, or due to assault. This would apply to situations like an unexpected, severe systemic reaction to a measles, mumps, and rubella (MMR) vaccine where the cause is determined to be a poisoning, but the intent is unknown.

• Always assign an additional code for the specific manifestation(s) of the poisoning.
• Do not use this code for adverse effects of correctly administered vaccines; those are coded differently.
• Ensure documentation clearly states "undetermined intent" for the poisoning to justify this specific code.