ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.4 > S90.42 S90.42 Blister (nonthermal) of toe Non-Billable/Non-Specific Codes S90.421Blister (nonthermal), right great toeS90.421A..., initial encounterS90.421D..., subsequent encounterS90.421S..., sequelaS90.422Blister (nonthermal), left great toeS90.422A..., initial encounterS90.422D..., subsequent encounterS90.422S..., sequelaS90.423Blister (nonthermal), unspecified great toeS90.423A..., initial encounterS90.423D..., subsequent encounterS90.423S..., sequelaS90.424Blister (nonthermal), right lesser toe(s)S90.424A..., initial encounterS90.424D..., subsequent encounterS90.424S..., sequelaS90.425Blister (nonthermal), left lesser toe(s)S90.425A..., initial encounterS90.425D..., subsequent encounterS90.425S..., sequelaS90.426Blister (nonthermal), unspecified lesser toe(s)S90.426A..., initial encounterS90.426D..., subsequent encounterS90.426S..., sequela