Trigger thumb, left thumb

This code signifies stenosing tenosynovitis affecting the flexor tendon of the left thumb, commonly known as trigger thumb. It is characterized by inflammation and narrowing of the tendon sheath, leading to catching, locking, or snapping of the thumb during flexion and extension. Patients typically experience pain and difficulty moving the affected digit.

Apply this code when documentation clearly indicates a diagnosis of trigger thumb specifically affecting the left thumb. This diagnosis is often supported by physical examination findings such as palpable nodule, tenderness over the A1 pulley, and characteristic triggering or locking of the thumb. Use for both acute and chronic presentations of the condition.

• Ensure the laterality (left thumb) is explicitly documented to support this specific code.
• Distinguish from other thumb conditions like De Quervain's tenosynovitis, which affects different tendons and has a separate code.
• If both thumbs are affected, separate codes for each laterality (e.g., M65.311 for right thumb) should be reported.