Toxic effect of phosphorus and its compounds, undet, sequela

This code signifies a long-term or residual health problem resulting from a previous exposure to phosphorus or its compounds, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. These sequelae are persistent conditions that manifest after the acute phase of the toxic effect has resolved.

Apply this code when documenting chronic health issues, such as organ damage (e.g., liver, kidney), neurological deficits, or bone abnormalities, that are directly attributed to a past phosphorus poisoning of unknown intent. This is appropriate when the acute toxic event is no longer active, but its lasting effects are being treated.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic hepatitis, osteonecrosis).
• Ensure documentation clearly links the current condition to a past phosphorus exposure and explicitly states the undetermined intent.
• Do not use this code for acute phosphorus poisoning; refer to the appropriate acute toxic effect codes for active poisoning.