ICD-10-CM > S00-T88 > T51-T65 > T65 > T65.8 > T65.82 > T65.822 T65.822 Toxic effect of harmful algae and algae toxins, intentional self-harm Non-Billable/Non-Specific Codes T65.822A..., initial encounterT65.822D..., subsequent encounterT65.822S..., sequela