S56.429A Laceration of extensor muscle, fascia and tendon of unspecified finger at forearm level, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S56.429 with 7th character A (initial encounter).

Applies from S56 Injury of muscle, fascia and tendon at forearm level

Excludes2 (not included here)

• injury of muscle, fascia and tendon at or below wrist (S66.-)
• sprain of joints and ligaments of elbow (S53.4-)

Code also

• any associated open wound (S51.-)

7th character note

• The appropriate 7th character is to be added to each code from category S56

7th character required

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

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to S56.429A

Back-references to S56

• Type 2 Excludes: S46 Injury of muscle, fascia and tendon at shoulder and upper arm level ("injury of muscle, fascia and tendon at elbow (S56.-)")
• Type 2 Excludes: S53 Dislocation and sprain of joints and ligaments of elbow ("strain of muscle, fascia and tendon at forearm level (S56.-)")

Diagnosis Index entries for S56.429A

• Injury › muscle (and fascia) (and tendon) › finger › extensor (forearm level) › laceration

Nearby codes

• S56.428 Laceration of extensor muscle, fascia and tendon of left little finger at forearm level
• S56.428A Laceration of extensor muscle, fascia and tendon of left little finger at forearm level, initial encounter
• S56.428D Laceration of extensor muscle, fascia and tendon of left little finger at forearm level, subsequent encounter
• S56.428S Laceration of extensor muscle, fascia and tendon of left little finger at forearm level, sequela
• S56.429 Laceration of extensor muscle, fascia and tendon of unspecified finger at forearm level
• S56.429A Laceration of extensor muscle, fascia and tendon of unspecified finger at forearm level, initial encounter (this code)
• S56.429D Laceration of extensor muscle, fascia and tendon of unspecified finger at forearm level, subsequent encounter
• S56.429S Laceration of extensor muscle, fascia and tendon of unspecified finger at forearm level, sequela
• S56.49 Other injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level
• S56.491 Other injury of extensor muscle, fascia and tendon of right index finger at forearm level
• S56.491A Other injury of extensor muscle, fascia and tendon of right index finger at forearm level, initial encounter