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Diagnosis Coding: Using the ICD-10-CM

Combination Codes for Poisonings

ICD-10-CM includes combination codes for poisonings and their associated external cause. These codes name both the substance taken and the intent.

No additional external cause code is needed for poisonings, toxic effects, adverse effects, and underdosing codes.

This chart gives an example of a combination code for poisonings.

Table 4. Example of ICD-10-CM combination code for poisoning
ICD-10-CM CodeDescription
T42.3X2SPoisoning by barbiturates, intentional self-harm, sequela