ICD-10-CM > S00-T88 > T51-T65 > T65 > T65.8 > T65.82 > T65.823 T65.823 Toxic effect of harmful algae and algae toxins, assault Non-Billable/Non-Specific Codes T65.823A..., initial encounterT65.823D..., subsequent encounterT65.823S..., sequela