ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.9 > S66.99 S66.99 Other injury of unspecified muscle, fascia and tendon at wrist and hand level Non-Billable/Non-Specific Codes S66.991Other injury of unspecified muscle, fascia and tendon at wrist and hand level, right handS66.991A..., initial encounterS66.991D..., subsequent encounterS66.991S..., sequelaS66.992Other injury of unspecified muscle, fascia and tendon at wrist and hand level, left handS66.992A..., initial encounterS66.992D..., subsequent encounterS66.992S..., sequelaS66.999Other injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified handS66.999A..., initial encounterS66.999D..., subsequent encounterS66.999S..., sequela