Underdosing of antidotes and chelating agents, sequela

This code indicates a long-term consequence or complication arising from the patient receiving an insufficient dose of an antidote or chelating agent. It signifies that the underdosing event itself is in the past, but its lingering effects are currently being addressed.

Use this code when documenting a condition that is a direct result of a previously inadequate administration of a substance intended to counteract a poison or remove heavy metals from the body. This applies to chronic organ damage, neurological deficits, or other persistent health issues attributable to the underdosing.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Do not use this code for acute underdosing events; it is specifically for residual conditions.
• Ensure documentation clearly links the current condition to a past underdosing of an antidote or chelating agent.