ICD-10-CM > S00-T88 > T51-T65 > T56 > T56.8 > T56.81 > T56.811 T56.811 Toxic effect of thallium, accidental (unintentional) Non-Billable/Non-Specific Applicable To Toxic effect of thallium NOS Codes T56.811A..., initial encounterT56.811D..., subsequent encounterT56.811S..., sequela