ICD-10-CM > S00-T88 > S00-S09 > S01 > S01.5 > S01.55 > S01.551 S01.551 Open bite of lip Non-Billable/Non-Specific Applicable To Bite of lip NOS Type 1 Excludes superficial bite of lip (S00.571) Codes S01.551A..., initial encounterS01.551D..., subsequent encounterS01.551S..., sequela