Effusion, left ankle

This code describes the presence of excess fluid within the joint capsule of the left ankle. This fluid accumulation, known as an effusion, can result from various underlying conditions such as inflammation, trauma, or infection, leading to swelling and discomfort.

Use this code when documentation explicitly states "effusion of the left ankle" or "left ankle effusion." This diagnosis is typically supported by physical examination findings of swelling and tenderness, and often confirmed by imaging studies like ultrasound or MRI demonstrating intra-articular fluid.

• Always specify laterality (left or right ankle) as documented.
• Code the underlying cause of the effusion if known and documented (e.g., traumatic injury, inflammatory arthritis).
• Do not confuse with edema, which is swelling in the surrounding soft tissues rather than within the joint itself.