Poisoning by succinimides

This code signifies an adverse reaction or overdose resulting from the ingestion or exposure to succinimide medications. These drugs are primarily anticonvulsants used to treat absence seizures, and poisoning can manifest with central nervous system depression, gastrointestinal symptoms, and other systemic effects.

Apply this code when documentation clearly indicates a toxic effect or overdose from a succinimide-based antiepileptic drug, such as ethosuximide, phensuximide, or methsuximide. This includes accidental ingestions, intentional overdoses, or adverse reactions due to improper dosage. Supporting documentation should specify the substance and the nature of the poisoning.

• Always code the specific succinimide drug if known and documented, using an E-code for external cause.
• Distinguish between poisoning (adverse effect due to overdose or wrong substance) and adverse effect in therapeutic use (correct substance, correct dose, but unexpected reaction).
• Sequence this code as the principal diagnosis when the poisoning is the primary reason for the encounter.