ICD-10-CM > S00-T88 > S50-S59 > S53 > S53.1 > S53.12 > S53.121 S53.121 Posterior subluxation of right ulnohumeral joint Non-Billable/Non-Specific Codes S53.121A..., initial encounterS53.121D..., subsequent encounterS53.121S..., sequela