Enteropathic arthropathies, left knee

This code signifies an inflammatory joint disease affecting the left knee, which is associated with an underlying inflammatory bowel disease (IBD) such as Crohn's disease or ulcerative colitis. It represents a reactive arthritis where the joint inflammation is triggered by the systemic effects of the gastrointestinal condition.

Apply this code when documentation explicitly states enteropathic arthropathy affecting the left knee. This diagnosis is typically supported by a patient's history of IBD and clinical findings of arthritis in the specified joint, often presenting with pain, swelling, and reduced range of motion.

• Ensure documentation clearly specifies "left knee" as the affected joint; laterality is crucial.
• Always code the underlying inflammatory bowel disease (e.g., Crohn's, ulcerative colitis) first, as it is the primary etiology.
• Distinguish from other forms of inflammatory arthritis, such as rheumatoid arthritis or psoriatic arthritis, which have different ICD-10-CM codes.