Hemarthrosis, right knee

This code signifies the presence of blood within the joint space of the right knee. It indicates an intra-articular hemorrhage affecting the right knee joint, often resulting in pain, swelling, and limited range of motion.

Use this code when documentation explicitly states hemarthrosis of the right knee. This often occurs following trauma, such as a ligament tear or fracture, or in patients with coagulopathies. Supporting documentation should include a physical exam noting effusion and aspiration findings confirming blood.

• Ensure laterality is clearly documented as "right knee" to avoid incorrect coding.
• Distinguish from other forms of knee effusion (e.g., serous, purulent) which have different codes.
• Code any underlying cause of the hemarthrosis (e.g., fracture, ligamentous injury) as a primary diagnosis if applicable.