Charcot's joint, left knee

This code represents neurogenic arthropathy, specifically affecting the left knee. Charcot's joint is a progressive degenerative arthropathy resulting from impaired pain sensation and proprioception, leading to repetitive microtrauma and joint destruction. It is often associated with underlying neurological conditions such as diabetes, syphilis, or spinal cord injury.

Use this code when documentation clearly indicates a diagnosis of Charcot's joint affecting the left knee. This diagnosis is typically supported by clinical findings of joint swelling, instability, deformity, and radiographic evidence of joint destruction, often in a patient with a known neurological disorder.

• Ensure the documentation specifies "Charcot's joint" or "neurogenic arthropathy" and clearly identifies the left knee as the affected site.
• Always code the underlying neurological condition (e.g., E10.65 for Type 1 diabetes with hyperglycemia and Charcot's arthropathy) as the primary diagnosis, followed by this code.
• Distinguish from other forms of degenerative arthritis; Charcot's joint involves a distinct neuropathic etiology.