ICD-10-CM > S00-T88 > S90-S99 > S91 > S91.0 > S91.05 S91.05 Open bite of ankle Non-Billable/Non-Specific Type 1 Excludes superficial bite of ankle (S90.56-, S90.57-) Codes S91.051Open bite, right ankleS91.051A..., initial encounterS91.051D..., subsequent encounterS91.051S..., sequelaS91.052Open bite, left ankleS91.052A..., initial encounterS91.052D..., subsequent encounterS91.052S..., sequelaS91.059Open bite, unspecified ankleS91.059A..., initial encounterS91.059D..., subsequent encounterS91.059S..., sequela