Toxic effect of formaldehyde, undetermined, sequela

This code signifies a long-term or residual health problem resulting from a past exposure to formaldehyde, where the intent of the exposure (e.g., accidental, intentional self-harm) is not documented. These sequelae can manifest in various organ systems, including respiratory, dermatological, or neurological issues, that persist after the acute phase of the toxic effect has resolved.

Apply this code when documenting chronic conditions or permanent damage directly attributed to a prior formaldehyde exposure, and the medical record lacks information regarding the circumstances of that exposure. This is appropriate for follow-up encounters addressing persistent symptoms or complications years after the initial incident.

• Always sequence this sequela code after the code for the specific residual condition (e.g., chronic bronchitis, dermatitis).
• Ensure the medical record clearly links the current condition to a past formaldehyde exposure.
• Avoid using this code for acute or subacute formaldehyde toxicity; those require codes from the acute phase of T59.2X.