ICD-10-CM > S00-T88 > T30-T32 > T31 > T31.2 T31.2 Burns involving 20-29% of body surface Non-Billable/Non-Specific Codes T31.20Burns involving 20-29% of body surface with 0% to 9% third degree burnsT31.21Burns involving 20-29% of body surface with 10-19% third degree burnsT31.22Burns involving 20-29% of body surface with 20-29% third degree burns