Charcot's joint, unspecified knee

This code represents a neuropathic arthropathy affecting an unspecified knee joint. Charcot's joint, also known as neurogenic arthropathy, is a progressive degenerative disease of a joint that results from nerve damage, leading to loss of sensation and proprioception. This loss of protective sensation allows for repetitive microtrauma and subsequent joint destruction.

Use this code when documentation clearly indicates a diagnosis of Charcot's joint affecting the knee, but the specific laterality (right or left) is not documented. This typically occurs in patients with underlying neurological conditions such as diabetes mellitus, syphilis, or spinal cord injury, who present with joint instability, swelling, and deformity.

• Do not use this code if the laterality of the affected knee is specified; instead, use M14.661 (right knee) or M14.662 (left knee).
• Always code the underlying neurological condition (e.g., E10.40 for Type 1 diabetes with neurological complications) as a primary or secondary diagnosis.
• Ensure documentation supports the diagnosis of Charcot's joint, including clinical findings and imaging results, to avoid payer denials.