ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.2 > T59.2X > T59.2X1 T59.2X1 Toxic effect of formaldehyde, accidental (unintentional) Non-Billable/Non-Specific Applicable To Toxic effect of formaldehyde NOS Codes T59.2X1A..., initial encounterT59.2X1D..., subsequent encounterT59.2X1S..., sequela