Deep necrosis of underlying tissues [deep third degree] without mention of loss of a body part, of lip(s)
Convert to ICD-10-CM: 
941.43 converts approximately to:
- 2015/16 ICD-10-CM T20.32XA Burn of third degree of lip(s), initial encounterOr: 
- 2015/16 ICD-10-CM T20.72XA Corrosion of third degree of lip(s), initial encounter