ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.2 > S56.20 S56.20 Unspecified injury of other flexor muscle, fascia and tendon at forearm level Non-Billable/Non-Specific Codes S56.201Unspecified injury of other flexor muscle, fascia and tendon at forearm level, right armS56.201A..., initial encounterS56.201D..., subsequent encounterS56.201S..., sequelaS56.202Unspecified injury of other flexor muscle, fascia and tendon at forearm level, left armS56.202A..., initial encounterS56.202D..., subsequent encounterS56.202S..., sequelaS56.209Unspecified injury of other flexor muscle, fascia and tendon at forearm level, unspecified armS56.209A..., initial encounterS56.209D..., subsequent encounterS56.209S..., sequela