ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.4 S66.4 Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.40Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelS66.401Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand levelS66.401A..., initial encounterS66.401D..., subsequent encounterS66.401S..., sequelaS66.402Unspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand levelS66.402A..., initial encounterS66.402D..., subsequent encounterS66.402S..., sequelaS66.409Unspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand levelS66.409A..., initial encounterS66.409D..., subsequent encounterS66.409S..., sequelaS66.41Strain of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelS66.411Strain of intrinsic muscle, fascia and tendon of right thumb at wrist and hand levelS66.411A..., initial encounterS66.411D..., subsequent encounterS66.411S..., sequelaS66.412Strain of intrinsic muscle, fascia and tendon of left thumb at wrist and hand levelS66.412A..., initial encounterS66.412D..., subsequent encounterS66.412S..., sequelaS66.419Strain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand levelS66.419A..., initial encounterS66.419D..., subsequent encounterS66.419S..., sequelaS66.42Laceration of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelS66.421Laceration of intrinsic muscle, fascia and tendon of right thumb at wrist and hand levelS66.421A..., initial encounterS66.421D..., subsequent encounterS66.421S..., sequelaS66.422Laceration of intrinsic muscle, fascia and tendon of left thumb at wrist and hand levelS66.422A..., initial encounterS66.422D..., subsequent encounterS66.422S..., sequelaS66.429Laceration of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand levelS66.429A..., initial encounterS66.429D..., subsequent encounterS66.429S..., sequelaS66.49Other specified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelS66.491Other specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand levelS66.491A..., initial encounterS66.491D..., subsequent encounterS66.491S..., sequelaS66.492Other specified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand levelS66.492A..., initial encounterS66.492D..., subsequent encounterS66.492S..., sequelaS66.499Other specified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand levelS66.499A..., initial encounterS66.499D..., subsequent encounterS66.499S..., sequela