ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.0 > T43.02 > T43.021 > T43.021A T43.021A Poisoning by tetracyclic antidepressants, accidental (unintentional), initial encounter Billable/Specific Copy Code Copy Description Applicable To Poisoning by tetracyclic antidepressants NOS