ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.1 > T24.13 > T24.139 T24.139 Burn of first degree of unspecified lower leg Non-Billable/Non-Specific Codes T24.139A..., initial encounterT24.139D..., subsequent encounterT24.139S..., sequela