ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.2 > S56.21 > S56.219 S56.219 Strain of other flexor muscle, fascia and tendon at forearm level, unspecified arm Non-Billable/Non-Specific Codes S56.219A..., initial encounterS56.219D..., subsequent encounterS56.219S..., sequela