Undrdose of pertussis vaccine, inc combin w pertuss, sequela

This code signifies a long-term health condition or complication arising from the insufficient administration of a pertussis-containing vaccine. This could include situations where a patient did not receive the full recommended series, received an inadequate dose, or experienced a significant delay in vaccination, leading to a subsequent health issue. The sequela indicates that the underdosing is not a current event but rather the historical cause of a present problem.

Use this code when documenting a patient presenting with a pertussis-related illness or other long-term health consequence that is directly attributed to a past underdosing of a pertussis vaccine. This applies when the underdosing itself is no longer an active issue, but its effects are still being managed. For example, a child with chronic respiratory issues linked to a severe pertussis infection due to incomplete vaccination.

• Always code the specific sequela (e.g., pertussis infection, chronic lung disease) first, followed by this code to indicate the underlying cause.
• Ensure documentation clearly links the current condition to the historical underdosing of the pertussis vaccine.
• This code is for the sequela of underdosing, not for the act of underdosing itself.