S66 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Injury of muscle, fascia and tendon at wrist and hand level.
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Any associated open wound (S61.-)
Sprain of joints and ligaments of wrist and hand (S63.-)
The appropriate 7th character is to be added to each code from category S66
A: initial encounter
D: subsequent encounter
S: sequela
Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level
Injury of flexor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level
Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
Injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level
Injury of other specified muscles, fascia and tendons at wrist and hand level
Injury of unspecified muscle, fascia and tendon at wrist and hand level
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