Trigger finger, unspecified little finger

This code represents a stenosing tenosynovitis affecting the flexor tendon of the little finger, characterized by a catching or locking sensation during finger flexion and extension. It results from inflammation and thickening of the tendon sheath, impeding smooth tendon glide.

This code is appropriate when the patient presents with symptoms of trigger finger specifically in the little finger, and the laterality (right or left) is not documented or cannot be determined. Documentation should clearly indicate the presence of trigger finger in the little finger, without specifying which hand.

• Ensure documentation explicitly states "little finger" and does not specify laterality.
• If laterality is known, use the more specific codes (M65.351 for right, M65.352 for left).
• Do not confuse with other finger conditions like Dupuytren's contracture or other forms of tenosynovitis.