S66.21 Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level

Non-billable header with 3 child codes.

Applies from S66 Injury of muscle, fascia and tendon at wrist and hand level

Excludes2 (not included here)

• sprain of joints and ligaments of wrist and hand (S63.-)

Code also

• any associated open wound (S61.-)

7th character note

• The appropriate 7th character is to be added to each code from category S66

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Codes under S66.21

• S66.211 Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level
• S66.212 Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level
• S66.219 Strain of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level

Code annotations containing back-references to S66.21

Back-references to S66.2

• Type 2 Excludes: S66.3 Injury of extensor 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 (S66.2-)")

Back-references to S66

• Type 2 Excludes: S56 Injury of muscle, fascia and tendon at forearm level ("injury of muscle, fascia and tendon at or below wrist (S66.-)")
• Type 2 Excludes: S63 Dislocation and sprain of joints and ligaments at wrist and hand level ("strain of muscle, fascia and tendon of wrist and hand (S66.-)")

Diagnosis Index entries for S66.21

• Injury › muscle (and fascia) (and tendon) › thumb › extensor (forearm level) › hand level › strain

Nearby codes

• S66.202S Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, sequela
• S66.209 Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level
• S66.209A Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
• S66.209D Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
• S66.209S Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
• S66.21 Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level (this code)
• S66.211 Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level
• S66.211A Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
• S66.211D Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
• S66.211S Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level, sequela
• S66.212 Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level