Poisoning by sulfonamides, undetermined, sequela

This code signifies a long-term or residual effect resulting from a past poisoning event involving sulfonamide medications. The original poisoning's intent (accidental, intentional self-harm, assault) could not be determined at the time of the acute event. The patient is now presenting with a condition directly attributable to that prior sulfonamide exposure.

Use this code when documenting a chronic condition or complication that is a direct consequence of a previous sulfonamide poisoning where the intent of the poisoning was unknown. This applies to follow-up encounters for conditions like persistent renal damage, dermatological issues, or hematological abnormalities that developed after the acute poisoning episode.

• Always sequence this code after the code for the specific sequela being treated (e.g., chronic kidney disease).
• Ensure documentation clearly links the current condition to the past undetermined sulfonamide poisoning.
• Do not use for acute poisoning events; this code is exclusively for sequelae.