ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.46 S20.46 Insect bite (nonvenomous) of back wall of thorax Non-Billable/Non-Specific Codes S20.461Insect bite (nonvenomous) of right back wall of thoraxS20.461A..., initial encounterS20.461D..., subsequent encounterS20.461S..., sequelaS20.462Insect bite (nonvenomous) of left back wall of thoraxS20.462A..., initial encounterS20.462D..., subsequent encounterS20.462S..., sequelaS20.469Insect bite (nonvenomous) of unspecified back wall of thoraxS20.469A..., initial encounterS20.469D..., subsequent encounterS20.469S..., sequela