S63.637A Sprain of interphalangeal joint of left little finger, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S63.637 with 7th character A (initial encounter).

Applies from S63 Dislocation and sprain of joints and ligaments at wrist and hand level

Includes

• avulsion of joint or ligament at wrist and hand level
• laceration of cartilage, joint or ligament at wrist and hand level
• sprain of cartilage, joint or ligament at wrist and hand level
• traumatic hemarthrosis of joint or ligament at wrist and hand level
• traumatic rupture of joint or ligament at wrist and hand level
• traumatic subluxation of joint or ligament at wrist and hand level
• traumatic tear of joint or ligament at wrist and hand level

Excludes2 (not included here)

• strain of muscle, fascia and tendon of wrist and hand (S66.-)

Code also

• any associated open wound

7th character note

• The appropriate 7th character is to be added to each code from category S63

7th character required

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

Applies from S63.6 Other and unspecified sprain of finger(s)

Excludes1 (never code together)

• traumatic rupture of ligament of finger at metacarpophalangeal and interphalangeal joint(s) (S63.4-)

Code annotations containing back-references to S63.637A

Back-references to S63

• Type 2 Excludes: S66 Injury of muscle, fascia and tendon at wrist and hand level ("sprain of joints and ligaments of wrist and hand (S63.-)")

Nearby codes

• S63.636 Sprain of interphalangeal joint of right little finger
• S63.636A Sprain of interphalangeal joint of right little finger, initial encounter
• S63.636D Sprain of interphalangeal joint of right little finger, subsequent encounter
• S63.636S Sprain of interphalangeal joint of right little finger, sequela
• S63.637 Sprain of interphalangeal joint of left little finger
• S63.637A Sprain of interphalangeal joint of left little finger, initial encounter (this code)
• S63.637D Sprain of interphalangeal joint of left little finger, subsequent encounter
• S63.637S Sprain of interphalangeal joint of left little finger, sequela
• S63.638 Sprain of interphalangeal joint of other finger
• S63.638A Sprain of interphalangeal joint of other finger, initial encounter
• S63.638D Sprain of interphalangeal joint of other finger, subsequent encounter